GST Registration in India (2026): Must You, Should You, and How to Apply Without a Rejection

GST | RegisCorp Team

You must take GST registration in India if your yearly turnover crosses ₹40 lakh (goods only) or ₹20 lakh (services or a mix), or if you make inter-state supplies of goods, sell goods through an e-commerce marketplace, or fall under reverse charge. Lower limits apply in some states. Below those lines, registration is optional, and often a bad idea. Since 1 November 2025, small B2B suppliers can also use the Rule 14A track, which promises a GSTIN within three working days after Aadhaar authentication.

Checked on 9 October 2026. This post is written by RegisCorp Consultancy LLP, a digital-first compliance firm in Kota, Rajasthan that files GST registrations across India. It is built around one idea: the decision comes before the application. Most people who get rejected, or who register and regret it, made the wrong decision first and the wrong form second.

Key takeaways

• Registration is a legal duty when you cross a turnover limit or hit a trigger that ignores turnover. The triggers are inter-state supply of goods, selling goods through a marketplace (with one narrow exception), reverse charge, casual or non-resident status, and a few others.
• Turnover is counted across India, per PAN, not per shop, state or business line. The clock starts the day you cross the limit, not at year end.
• You have 30 days from that day to apply. If you apply inside the window, registration takes effect from the day you crossed the limit.
• Below the limits, register only for a specific reason: corporate clients who need your GST invoice, input tax credit worth more than the filing cost, or a near-term plan to cross the limit.
• If most of your customers are individuals who cannot claim credit, voluntary registration can cost you money. In our freelancer example, absorbing GST on consumer work cost more than the credit recovered.
• Rule 14A (from 1 November 2025) is an opt-in fast track for suppliers whose monthly output tax on sales to registered buyers stays within ₹2.5 lakh. Aadhaar authentication is mandatory on that track.
• Most rejections trace to a short list of causes: name or address mismatch, weak proof of premises, failed Aadhaar or physical verification, and a missed officer query. Each has a fix.
• The first 90 days matter as much as the approval: bank details, invoice format, opening-stock credit within 30 days, and a choice between monthly returns, QRMP and composition.

GST registration in India: the key numbers and dates in one table

What changed in the last twelve months

Four changes affect anyone registering today.

Rate rationalisation, 22 September 2025. Most goods and services moved to a 5% or 18% rate, with a 40% rate for a short list of sin and luxury items. The GST Council's own FAQ on the change says the registration threshold for goods is unchanged. Rates matter to your registration decision because they decide how much GST you would add to a price, and how much credit you could claim. Look up the current rate for your HSN or SAC code before you do any calculation; do not reuse a 2024 rate list.

Rules 9A and 14A, from 1 November 2025. The GST Council's November 2025 newsletter describes two new routes. Rule 9A lets the portal grant registration electronically within three working days for applicants it scores as low risk. Rule 14A is the optional simplified scheme for small suppliers. Secondary sources attribute both to Notification 18/2025-Central Tax dated 31 October 2025. We could not open the notification PDF itself on 9 October 2026, so the operative wording below comes from the Council newsletter and professional summaries.

Rule 14A withdrawal, 2026. Withdrawal from the scheme uses Form GST REG-32 and was enabled online by a GSTN advisory dated 21 February 2026, as reported by professional sites. For withdrawals on or after 1 April 2026, returns for at least one tax period must have been filed.

Officer instructions, 17 April 2025. CBIC Instruction No. 03/2025-GST tells officers how to process registration applications. It limits unnecessary queries, says one listed document is enough to prove an owned business premises, and sets timelines. It is the closest thing to an official statement of what officers should and should not ask.

Not yet law: the 57th GST Council meeting, 8 October 2026. Press reports from 9 October say the Council recommended more automation of registration, a simplified registration for small e-commerce sellers who have no premises in other states, auto-accepted amendments and cancellations, and an optional "annual return, quarterly payment" scheme for B2C businesses up to ₹5 crore. These are recommendations. We saw no notification putting any of them into effect, so nothing in this post depends on them.

Who must take GST registration: the "must" test

Run these checks in order. The first "yes" settles the question.

Check 1: Is any trigger independent of turnover?

Section 24 of the CGST Act lists persons who must register whatever their turnover. The CBIC text of Section 24 covers:

• persons making any inter-state taxable supply
• casual taxable persons
• persons who pay tax under reverse charge
• non-resident taxable persons
• persons who must deduct tax at source under Section 51
• agents who supply on behalf of another taxable person
• input service distributors
• sellers of goods or services through an e-commerce operator that collects tax at source under Section 52
• e-commerce operators that collect tax at source

Each of these has carve-outs. Read the ones that fit you before you conclude anything.

Inter-state supply of goods. If you ship goods to a buyer in another state, you need registration from the first rupee. There is a narrow exemption for certain handicraft goods. Otherwise, no turnover test saves a small manufacturer or trader who sells across a state border.

Inter-state supply of services. Services are treated differently. Notification 10/2017-Integrated Tax exempts a person making inter-state supplies of taxable services from registration if their aggregate turnover stays within ₹20 lakh, or ₹10 lakh in special category States. That is why a Jaipur designer billing a Mumbai company does not need a GSTIN until the services limit is crossed.

E-commerce sellers of goods. Section 24(ix) says sellers on a platform that collects tax at source must register. Since 1 October 2023, Notification 34/2023-Central Tax has carved out a narrow exception, and many older guides still miss it. A goods seller can skip registration if all of these hold: turnover in the previous and current year stays within the Section 22(1) limit for their state, they make no inter-state supply of goods, they sell through platforms in only one state or union territory, they hold a PAN, and they first enrol on the portal and receive an enrolment number. The enrolment number stops being valid once the person is registered. If you sell across state lines on any marketplace, the exception is closed to you, and you must register. For the wider compliance picture around online selling, our dropshipping compliance guide covers the model-specific issues.

E-commerce sellers of services. Notification 65/2017-Central Tax exempts small service providers who supply through an e-commerce operator, up to ₹20 lakh (₹10 lakh in special category States), subject to conditions in the notification.

Reverse charge. The GST Council's reverse charge flyer states that a person liable to pay tax under reverse charge must register, and the ₹20 lakh limit does not apply to them. Reverse charge covers specified inward supplies such as goods transport agency services and legal services from an advocate. Notification 5/2017-Central Tax separately exempts a supplier whose entire supply is taxed under reverse charge in the recipient's hands. If you are a small unregistered business that receives a reverse-charge service, ask a professional before you assume you are outside the net.

Casual and non-resident taxable persons. A trade-fair stall holder or seasonal vendor in a state where they have no fixed place of business must register before they start. Under Section 27, the certificate lasts for the period in your application or 90 days, whichever is shorter, and an officer can extend it by up to 90 days. You must deposit your estimated tax liability in advance. The CBIC FAQs say to apply at least five days before you begin.

Other triggers. Tax deductors and collectors, agents and input service distributors have their own registration rules. Overseas suppliers of online information and database services follow a separate route. This post does not cover them.

Check 2: Have you crossed the turnover limit?

If no trigger applies, compare your turnover with the limit for your state and type of supply.

Goods-only suppliers. Section 22(1) sets the base limit at ₹20 lakh. Notification 10/2019-Central Tax, effective 1 April 2019, lets goods-only suppliers go to ₹40 lakh. The notification does not apply to persons making intra-state supplies in Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, Puducherry, Sikkim, Telangana, Tripura and Uttarakhand. It also does not help anyone who must register under Section 24, anyone who opted in voluntarily, or suppliers of ice cream, pan masala and tobacco products. Rajasthan is not on the exclusion list, so a goods-only trader in Kota works to ₹40 lakh.

Services and mixed suppliers. The limit is ₹20 lakh. If you sell both goods and services, you are not "goods-only" and the ₹20 lakh limit applies to your combined turnover.

Special category States. Section 22(1) lowers the limit to ₹10 lakh for suppliers in special category States, defined by reference to Article 279A of the Constitution. Secondary sources disagree on exactly which States count and how the ten-State exclusion list interacts with it. We therefore do not publish a State-by-State table. Check your State's limit on the GST portal or with a professional before relying on the ₹40 lakh or ₹20 lakh figure.

What counts as turnover. The Act uses "aggregate turnover". It covers all your supplies on your own account and on behalf of principals, taxable and exempt, including exports, calculated across India against one PAN. It excludes the GST you charge. Two businesses under one PAN are added together, even if you treat them as separate. If you run a shop in Kota and an online store from the same PAN, the two turnovers are summed for this test.

Check 3: How fast must you move?

Section 25 gives you 30 days from the day you become liable. Under Rule 10, a registration applied for inside that window takes effect from the day your liability began. Apply later and it takes effect from the date of grant. That gap matters. Your liability starts when you cross the limit, but you cannot charge GST until you hold a GSTIN, so tax on the days in between comes out of your own pocket.

The penalty for failing to register when liable sits in Section 122(1)(xi). The base is ₹10,000 or the amount of tax involved, whichever is higher. Whether your case runs under the non-fraud or fraud demand provisions changes the final penalty, and we have not modelled that here.

Should you register when you do not have to?

Voluntary registration is allowed under Section 25(3). It is a business decision, and it has costs. Think of it as buying three things and paying for three others.

What you buy.

• Credit on your purchases. Registered businesses claim input tax credit on GST they pay on inputs and services. An unregistered business treats that GST as a plain cost.
• Access to buyers. Many companies cannot take credit on an unregistered vendor's bill, and some finance teams will not onboard unregistered vendors.
• Marketplace and tender eligibility. Some channels ask for a GSTIN even when the law does not.

What you pay.

• Filing work. You file returns on a calendar, including nil returns.
• GST on your own sales. You must charge GST, or you absorb it from the price you were already charging.
• A permanent record. Every invoice you raise is visible to the department and to your buyers' returns.

GST for freelancers and service providers

A freelancer or consultant billing under ₹20 lakh, in services only, is not forced to register, even when clients are in other states. The decision depends on who pays you.

• If most of your income comes from GST-registered businesses, they can claim the GST you charge. They lose nothing by paying it, and you can recover credit on your costs. Registration usually works.
• If most of your income comes from individuals or small unregistered clients, GST is a price increase they cannot offset. Either you lose clients, or you absorb the GST. Registration usually hurts.
• If you export services, you can still operate without registration below the limit, but you cannot file a letter of undertaking or claim a refund of credit without a GSTIN. If you plan to export at volume, register.

The worked example below puts numbers on this.

Registering because you expect to cross the line

If you expect to cross the limit within a few months, registering early costs you the filing work you will have anyway. It also lets you claim credit on opening stock under Section 18(1)(b) for inputs held on the day before registration is granted. The practical rule is to register before you sign long-term contracts with buyers who need a GSTIN, not after.

When not to register

Skip voluntary registration if you are under the limits, have no inter-state goods supply, have no business clients demanding a GST invoice, and your GST-bearing costs are small. In that case registration gives you filing obligations and nothing back. Keep a monthly turnover tracker instead, and revisit when you reach about 70% of the limit.

The decision framework in one pass

1. If everything you supply is exempt or non-taxable, you are generally outside GST registration. Confirm with a professional before you rely on this.
2. If you make inter-state supplies of goods, or sell goods through a marketplace in more than one state, or you are a casual or non-resident taxable person, you must register.
3. If you are liable under reverse charge, or must deduct or collect tax at source, you must register.
4. If your PAN-wide aggregate turnover this year exceeds your limit, you must register within 30 days.
5. If none of these applies, ask whether you have a specific, recurring reason: registered business clients who need invoices, credit worth more than your filing cost, or a plan to cross the limit within months. If yes, you should register, and consider Rule 14A.
6. If you have no such reason, you should not register yet. Track turnover monthly.

Worked example: a freelancer, a small trader and an e-commerce seller

All figures are for one financial year. They rest on the assumptions stated, which are illustrations and not benchmarks. Real rates vary by item, so check your HSN or SAC code.

Case A: the freelancer (a UX designer in Jaipur)

Assumptions. Fees of ₹16,00,000, of which ₹11,20,000 (70%) come from GST-registered companies in several states and ₹4,80,000 (30%) from individuals. Services are taxed at 18%. Business costs before GST are ₹2,70,000 (software ₹90,000, co-working ₹1,20,000, a laptop ₹60,000), all at 18%, so GST paid on costs is ₹48,600. If registered, an accountant costs ₹18,000 a year (an assumption). She makes inter-state supplies of services only and stays under ₹20 lakh, so registration is optional.

Option 1: stay unregistered. Income before income tax is ₹16,00,000 − ₹2,70,000 − ₹48,600 = ₹12,81,400. The GST on costs is a plain cost.

Option 2: register and charge 18% on top to everyone. Output tax is 18% of ₹16,00,000 = ₹2,88,000. Credit is ₹48,600. Net GST paid to the government is ₹2,39,400, funded by clients. Income is ₹16,00,000 − ₹2,70,000 − ₹18,000 = ₹13,12,000. That is ₹30,600 better than Option 1, which equals the credit of ₹48,600 minus the ₹18,000 accountant.

Option 3: register, but individual clients will not pay more. She keeps her prices to individuals fixed, so ₹4,80,000 now contains GST of ₹4,80,000 × 18 ÷ 118 = ₹73,220. Her fee income from them falls to ₹4,06,780. Income is ₹11,20,000 + ₹4,06,780 − ₹2,70,000 − ₹18,000 = ₹12,38,780. That is ₹42,620 worse than staying unregistered.

The break-even. Registration pays only while the consumer revenue she has to absorb stays below about ₹2,00,600, or 12.5% of her fees. Above that, the credit does not cover the GST she gives up. If she serves mostly companies, she should register. If she serves mostly individuals, she should not.

Rule 14A check. Her output tax on supplies to registered persons is ₹11,20,000 × 18% = ₹2,01,600 a year, or ₹16,800 a month. That is far below the ₹2,50,000 monthly cap, so she could opt for Rule 14A. Sales to individuals are not counted in that test, per the summaries we read.

Her income tax treatment is a separate question; see our business income tax return filing service for that side.

Case B: the small trader (a stationery wholesaler and retailer in Kota)

Assumptions. Sales of ₹52,00,000 at shelf prices that already include GST. Purchases of ₹40,00,000 including GST, all from registered suppliers. All goods at 18%. Sales are intra-state and mostly to walk-in customers. Because goods-only turnover exceeds ₹40 lakh, he must register. Real shops mix 5% and 18% goods, and the answer moves with the mix.

Regular scheme. Taxable value of sales: ₹52,00,000 ÷ 1.18 = ₹44,06,780. Output tax: ₹7,93,220. Purchases excluding GST: ₹33,89,831. Credit: ₹6,10,169. Net GST payable: ₹1,83,051. Margin before other costs: ₹44,06,780 − ₹33,89,831 = ₹10,16,949.

Composition scheme. The trader pays 1% of turnover with no credit and issues a bill of supply. Tax: 1% × ₹52,00,000 = ₹52,000. Margin before other costs: ₹52,00,000 − ₹40,00,000 − ₹52,000 = ₹11,48,000.

Result. Composition leaves him ₹1,31,051 better off, because his inclusive margin is 23.1% of sales (₹12,00,000 on ₹52,00,000).

The rule behind it. With everything at 18%, composition costs less than the regular scheme whenever the inclusive margin exceeds about 6.6% of sales (1% × 1.18 ÷ 0.18). At 5% goods the break-even margin is 21%. At 12% it is about 9.3%. The thinner your margin and the higher your tax rate, the more the regular scheme favours you.

What the numbers hide. Composition bars inter-state outward supply, and a business buyer cannot claim credit on a bill of supply. If this trader wants to sell to schools and offices that need tax invoices, or ship to another state, the 1% rate stops being relevant. Composition also taxes turnover even in a loss-making year. We assumed all of his sales are taxable; whether the 1% applies to total or only taxable turnover is a point on which secondary sources differ.

Case C: the e-commerce seller (home decor, Jaipur)

Assumptions. Sales through a marketplace of ₹30,00,000 excluding GST, mostly to other states, at 18%. Purchases of goods ₹19,00,000, packaging ₹1,50,000, marketplace fees ₹3,00,000 and advertising ₹1,00,000, all excluding GST and all at 18%.

Must she register? Yes. She makes inter-state supplies of goods, so Section 24(i) applies. The Notification 34/2023 exception is closed because it requires intra-state sales only. Her ₹30,00,000 turnover is below ₹40 lakh, and that fact does not help.

The numbers. Output tax: ₹30,00,000 × 18% = ₹5,40,000. Credit on ₹24,50,000 of costs: ₹4,41,000. Net GST: ₹99,000. The marketplace collects tax at source on her sales. At 0.5%, as reported by secondary sources for the rate effective 10 July 2024, that is ₹15,000. It shows up in her electronic cash ledger and reduces the cash she pays: ₹99,000 − ₹15,000 = ₹84,000.

The lesson. If this seller had sold only within Rajasthan, through marketplaces in one state, at ₹9 lakh, she could have enrolled instead of registering. The moment a single parcel crosses a state line, that option disappears.

The three cases side by side

GST registration documents

The portal asks for documents in four groups. File formats are JPG or PDF, and size limits differ by document type (100 KB, 500 KB or 1 MB). The GST portal registration FAQs give the limits, and the portal's own checklist is the final word.

Identity and constitution.

• PAN of the applicant or entity, and Aadhaar of the proprietor, partners, directors and authorised signatory
• Passport-size photographs (JPEG, up to 100 KB)
• Proof of constitution: a partnership deed, certificate of incorporation, LLP agreement or other registration certificate

The right entity type sets what you upload. If you are still deciding, read our comparison of private limited company, LLP, OPC and partnership, or look at sole proprietorship, partnership firm, LLP and private limited company registration.

Authorised signatory.

• A letter of authorisation, or a board resolution with an acceptance letter, naming the person who will sign and file

Principal place of business. The portal's checklist accepts a property tax receipt, municipal khata copy, electricity bill, rent or lease agreement, consent letter, or a government-issued document. Instruction 03/2025-GST adds detail for officers:

• For premises you own, one listed document is enough.
• For rented premises, the rent or lease agreement plus one ownership document of the landlord is generally enough. The landlord's identity proof is needed only if the agreement is unregistered.
• Officers are told not to ask for originals or to raise queries unrelated to the documents you filed.

Bank account. The CBIC FAQs say at least one account is required, a personal account can be used temporarily, and acceptable proof is a bank statement or the first page of the passbook. Under Rule 10A you must furnish bank details on the portal within 30 days of grant, or before your first GSTR-1, whichever is earlier.

Signing. Companies and LLPs sign with a digital signature certificate. Other constitutions can use an Aadhaar e-sign or an electronic verification code. The e-sign route needs the mobile number linked to Aadhaar. Check the current option for your constitution when you reach the final step, because we could not confirm the full rule for each type on 9 October 2026.

GST registration process, step by step

Step 1: Part A and the TRN

You enter your PAN, state, email and mobile number in Part A of Form GST REG-01. Under Rule 8, the portal checks your PAN against the income tax database and sends OTPs. It then issues a Temporary Reference Number. The CBIC FAQs say the TRN expires 15 days after it is generated, however many times you log in. Do not start Part A until your documents are ready.

Step 2: Part B

Using the TRN, you file Part B with business details, places of business, promoter or partner details, goods and services with HSN or SAC codes, bank details and uploads. This is also where you choose Aadhaar authentication and, if you want, opt for Rule 14A and the composition scheme.

Step 3: Aadhaar authentication

Authentication is optional for the standard track and mandatory for Rule 14A. The primary authorised signatory and one promoter or partner each receive a link and confirm by OTP. Under Rule 8(4A), the submission date is the date of authentication, or 15 days after you file Part B, whichever is earlier. Applicants the portal flags on risk parameters must complete biometric Aadhaar authentication, give photographs and have originals checked at a facilitation centre. The Rule lets the Government exclude some States from the biometric requirement, and an earlier version applied only in Gujarat. We could not confirm the current State list.

Step 4: Submit and receive the ARN

You sign with a DSC, e-sign or EVC, and the portal issues an acknowledgement in Form GST REG-02 and an Application Reference Number. Keep the ARN. It is how you track status.

Step 5: What the officer does

Under Rule 9 as amended, the officer has these options:

1. Approve within 7 working days of submission, if documents are in order.
2. Issue a notice in Form GST REG-03 within 7 working days, asking for clarification or a correction. The reply in Form GST REG-04 is due within 7 working days of the notice.
3. Approve within 7 working days of your reply, or reject in Form GST REG-05 with written reasons.
4. If the officer does nothing in the period, the application is deemed approved.

The 30-day track applies where Aadhaar authentication was not done, where the portal flagged you on risk parameters, or where an officer with the Commissioner's approval orders verification. In that case registration is granted within 30 days after physical verification, and the officer can issue a REG-03 within the 30 days. Under Rule 25, the verification report in Form GST REG-30 must be uploaded at least five working days before that deadline.

Two cautions. The CBIC registration FAQs still say you get a response "within 3 common working days". That figure reflects the earlier text of Rule 9; the rule now says 7. And Instruction 03/2025-GST tells officers that applications should not drift into deemed approval through delay. Do not plan around deemed approval.

Step 6: Rule 14A and Rule 9A, the 3-day track

Under Rule 9A, the portal can approve low-risk Rule 8 applications electronically within three working days. Rule 14A goes further for small suppliers. The conditions, as described by the GST Council newsletter and professional summaries:

• You tick "Yes" for Rule 14A in Form GST REG-01.
• Your own assessment is that output tax (CGST, SGST/UTGST, IGST and cess) on supplies to registered persons will not exceed ₹2,50,000 a month.
• Aadhaar authentication is done for the primary authorised signatory and at least one promoter or partner. Persons notified under Section 25(6D) are excepted.
• You hold only one Rule 14A registration per State or union territory against the same PAN.
• The portal does not flag you as high risk. Summaries say high-risk cases are sent to the standard Rule 9 process.

If you cross ₹2.5 lakh a month, you must withdraw using Form GST REG-32. The officer approves in Form GST REG-33 or rejects in Form GST REG-05, and the higher liability is declared from the first day of the next month. You cannot withdraw while cancellation proceedings are pending. The 56th Council meeting said the scheme could benefit around 96% of new applicants, which is the Council's estimate and not a guarantee for you.

Rule 14A does not change your duties after approval. You still issue compliant invoices, file returns and answer notices. It changes the speed of the front door.

Step 7: Certificate and GSTIN

On approval, the portal issues a registration certificate in Form GST REG-06 with your GSTIN. The GSTIN has 15 characters: a two-digit State code, your PAN, a two-character entity code and a check digit. If your application was deemed approved, the certificate follows shortly after the period lapses, as Rule 10(5) provides.

Timeline table: statutory days versus what to plan for

GST registration fees

We found no government fee for GST registration in the rules or portal documents we read, and practitioners widely state that the portal charges none. What you pay for is professional help: preparing documents, handling officer queries and setting up the first returns. Quotes vary with entity type, the number of places of business and how clean your records are. You can price our service on the quote calculator or read about the GST registration service. Be wary of anyone who calls their service charge a "government fee".

GST registration rejected: the causes seen most often, and the fix

No official table of REG-05 reasons exists. The list below comes from CBIC's own instruction to officers, the CBIC FAQs and practitioner write-ups. Treat the frequency as unmeasured.

Mismatch between PAN, Aadhaar and the form

A middle name written in full on one record and as an initial on another is enough. Fix it by correcting the record that is wrong, through the income tax portal or UIDAI, before you apply. Enter the name exactly as on the PAN.

Weak or inconsistent proof of premises

The address on the form, the rent agreement and the utility bill differ by a floor, a unit label or a spelling. Another common problem is premises owned by a relative with no consent letter. Copy the address character for character from the document. Under Instruction 03/2025-GST, a rented premises generally needs the agreement plus one ownership document of the landlord. Add a consent letter when the owner is not the applicant, and a clear floor plan when several firms share a space.

A virtual office or a co-working desk with no real presence

An address that exists only on paper fails verification. Use a place where the business works, with a consent letter and a recent bill. Where a co-working space is genuine, have its agreement and the operator's consent ready.

Failed physical verification

The officer visits and finds a locked premises, no signboard, no one who knows the business, or activity that does not match what you declared. Under Rule 25, the officer uploads a report in Form GST REG-30. Keep a person on site in working hours after you apply, display a signboard, and keep your documents at the premises.

Aadhaar authentication problems

The Aadhaar mobile number is inactive or different from the one you use, so OTPs never arrive. Update the number with UIDAI first, or use the facilitation centre route. A failed authentication usually moves you to the 30-day verification track.

Missed REG-03

You have 7 working days to reply in REG-04. If you do not reply, or the officer is unhappy with the reply, the application may be rejected. Check the portal and the registered email every day while the ARN is open. Answer exactly what was asked, with the document requested.

Wrong constitution, state or place of business

Applying as a proprietorship when you are a partnership, picking the wrong State, or declaring a principal place that does not match your proof all cause queries. Decide the entity first. A partnership firm needs its deed, a company its certificate of incorporation.

Blurry or wrongly formatted uploads

Unreadable scans, merged documents, wrong formats or files over the limit lead to queries. Scan each document separately at the right size.

After a rejection

Read the REG-05 order, fix every reason in it, and file a fresh application. If you believe the rejection is wrong, you can appeal under Section 107 using Form GST APL-01. Two sources we read quote the window as three months from communication of the order, which matches Section 107; one practitioner page says 30 days. Do not wait that long in either case. A fresh application with the defect fixed is usually faster than an appeal.

The first 90 days after you get a GSTIN

Days 1 to 7: set the base

1. Open the registration certificate and check the legal name, trade name, address, State and the goods and services listed. Amend anything wrong now.
2. Furnish bank details on the portal. Rule 10A sets the 30-day limit, and practitioner reports say the portal can suspend a registration that misses it.
3. Fix your invoice format and software. Use a serial number of up to 16 characters that is unique within the financial year.
4. Decide your scheme: regular or composition. Composition is chosen in Part B of the application or, for an existing registration, on Form CMP-02 before the financial year begins.
5. Decide your return frequency if you are eligible for QRMP.

Days 1 to 30: claim opening-stock credit

If you applied within 30 days of becoming liable, Section 18(1)(a) lets you claim credit on inputs in stock, and inputs in semi-finished or finished goods, on the day before you became liable. Voluntary registrants claim under Section 18(1)(b) on stock on the day before grant. You make the claim in Form GST ITC-01 within 30 days. Capital goods are not covered under Section 18(1)(a) as we read it. If credit exceeds ₹2 lakh, a chartered accountant or cost accountant must certify the details. Credit cannot be claimed on invoices older than one year. Missing this window loses credit permanently. On ₹3,00,000 of stock at 18%, that is ₹54,000.

Writing a valid invoice

Rule 46 requires these on a tax invoice:

• your name, address and GSTIN, a unique serial number and the date
• the buyer's name, address and GSTIN if registered; for unregistered buyers, name, address and State where the supply is ₹50,000 or more
• the HSN or SAC code, description, quantity, taxable value after discount, tax rates and amounts
• the place of supply for inter-state sales, and whether tax is payable under reverse charge
• your signature, or a digital signature (not needed on an electronic invoice)

Issue service invoices within 30 days of supply under Rule 47. For HSN digits, a notification effective 1 April 2021 (cited as 78/2020-Central Tax) asks for 4 digits for turnover up to ₹5 crore on B2B invoices, and 6 digits above. Since the May 2025 return period, GSTR-1 uses an HSN drop-down in Table 12. Composition taxpayers and exempt suppliers issue a bill of supply and cannot charge GST. Keep your books tidy from day one; our bookkeeping and accounting work is built around exactly this step.

Your first returns

Regular taxpayers file two returns each month. GSTR-1 reports your sales and is due on the 11th of the next month. GSTR-3B reports and pays tax and is due on the 20th. QRMP is available up to ₹5 crore turnover. Under it you file quarterly returns and pay tax monthly. Per the GST portal QRMP FAQs, the invoice furnishing facility for the first two months of a quarter closes on the 13th of the next month. The quarterly GSTR-1 is due on the 13th after the quarter. The quarterly GSTR-3B is due on the 22nd or 24th, depending on your State. Monthly tax payment in Form PMT-06 is due on the 25th, per a QRMP guide from the Institute of Cost Accountants of India. A new registration in the first month of a quarter can opt in from that quarter; one granted in the last two months can opt in only from the next.

File a nil return when you had no sales. Late fees run per day per return, with lower rates for nil returns, and interest at 18% a year applies to tax paid late. The caps depend on turnover. We took these figures from secondary sources and list them as unverified below. Our GST return filing and GST compliance services exist for this recurring work.

Composition versus regular: decide using your own numbers

Composition is for small businesses that sell mostly to consumers, within one State, with thin credit. Use the break-even in Case B. Keep these limits in mind:

• turnover up to ₹1.5 crore for goods (₹75 lakh in certain States), ₹50 lakh for services
• rates of 1% for traders and manufacturers, 5% for restaurants without alcohol, 6% for service providers
• no inter-state outward supply, no credit, no tax collected from customers
• exclusions for manufacturers of ice cream, pan masala and tobacco
• one scheme for all registrations under the same PAN
• Form CMP-08 each quarter by the 18th of the following month, and the annual GSTR-4 by 30 June

Sources disagree on whether supply through e-commerce operators is allowed after October 2023 and on which States get the ₹75 lakh limit. If you plan to sell online or across State lines, assume composition is unavailable until a professional says otherwise.

E-invoicing, later

E-invoicing applies to B2B businesses above a notified turnover threshold, which professional sources put at ₹5 crore. Reporting must happen within 30 days of the invoice date for businesses at ₹10 crore and above, from 1 April 2025. One article we read says e-invoicing at ₹5 crore starts on 1 April 2026; we could not reconcile that with other sources or confirm it on the official portal. If you are near ₹5 crore, confirm the current position with a professional.

Mistakes that cost money

1. Counting turnover per shop or per State. The test is across India under one PAN. A goods trader with ₹25 lakh of supplies in Rajasthan and ₹18 lakh in Gujarat has crossed ₹40 lakh and must register in each State where he supplies, even though neither State alone is close.
2. Waiting for year end. Liability starts the day you cross the limit. If a trader makes ₹6,00,000 of sales after crossing and before registering, he cannot charge GST on them. At 18%, the tax is ₹1,08,000 if the department treats ₹6,00,000 as the taxable value, and about ₹91,525 if it treats the figure as tax-inclusive. We do not know which view an officer would take. Add interest at 18% a year (about ₹2,400 for 45 days on ₹1,08,000) and a penalty of at least ₹10,000. The customers have already paid, and you cannot collect from them.
3. Absorbing GST on consumer work. Case A shows ₹73,220 of GST absorbed against ₹48,600 of credit.
4. Choosing composition and then selling across a State line. An inter-state sale ends eligibility. Moving out of the scheme means a withdrawal form, a new credit position and work on stock. You also lose business buyers who needed tax invoices.
5. Using an address you cannot support. A co-working desk with no consent letter, or a relative's shop with no NOC, invites a REG-03 or a failed visit.
6. Letting REG-03 sit unread. Seven working days is short. A missed reply can mean rejection and a new application.
7. Missing the 30-day opening-stock window. Credit on ₹3,00,000 of stock at 18% is ₹54,000, and the window is not extendable by you.
8. Skipping bank details. Without them, you may be unable to file GSTR-1, which stalls everything after.
9. Filing nothing in a no-sales month. A nil return is still a return. Late fees and a compliance record follow.
10. Registering "to look professional". If no client needs it and your credit is small, you buy a monthly filing job and no benefit.

Frequently asked questions

Who needs GST registration in India?

You need it if your aggregate turnover crosses ₹40 lakh for goods only or ₹20 lakh for services or a mix, subject to lower limits in some States. You also need it regardless of turnover if you make inter-state supplies of goods, sell goods across State lines through a marketplace, are liable under reverse charge, or are a casual or non-resident taxable person. Apply within 30 days of becoming liable.

What is the GST registration threshold in 2026?

For most States it is ₹40 lakh for goods-only suppliers and ₹20 lakh for service providers and mixed suppliers. Special category States have a lower limit of ₹10 lakh, and goods suppliers in ten listed States and union territories do not get the ₹40 lakh relief for intra-state sales. The GST Council's FAQ on the September 2025 changes says the goods threshold is unchanged. Confirm your own State's figure before you rely on it.

Do freelancers need GST registration?

Not unless they cross ₹20 lakh of turnover or hit a trigger such as reverse charge liability. Inter-state services are exempt from registration up to ₹20 lakh under Notification 10/2017-Integrated Tax. A freelancer with mostly company clients often benefits from registering voluntarily, because clients can claim the GST. One with mostly individual clients usually does not.

Do I need GST registration to sell on Amazon or Flipkart?

Usually yes. Section 24(ix) requires sellers of goods through a platform that collects tax at source to register. The exception under Notification 34/2023 applies only if you stay within your State's limit, make no inter-state supply of goods, sell through platforms in only one State, and enrol on the portal first. If a parcel crosses a State border, you must register.

What documents are required for GST registration?

You need the PAN and Aadhaar of the applicant, a proof of constitution, a photograph, proof of the principal place of business, a letter authorising your signatory, and bank proof. For owned premises, one document such as an electricity bill or property tax receipt is enough. For rented premises, expect to give the rent agreement and an ownership document of the landlord.

How long does GST registration take?

The Rule 9 timeline is 7 working days for an Aadhaar-authenticated application with no query, and 30 days where physical verification applies. An officer query adds a 7-working-day reply period and up to 7 more working days to decide. Rule 9A and Rule 14A promise three working days when the portal clears the application. Plan for longer if your documents are not clean.

What is Rule 14A simplified GST registration?

It is an opt-in track that began on 1 November 2025 for small suppliers. You qualify if you assess your output tax on supplies to registered persons at no more than ₹2.5 lakh a month. Aadhaar authentication is mandatory, and you can hold one such registration per State per PAN. If the portal clears you, registration is granted within three working days after authentication.

What are the GST registration fees?

We found no government fee for GST registration in the rules or portal documents we read. You pay only for professional help if you use it, and fees depend on your entity type, number of locations and the state of your records. Treat any charge labelled a "government fee" with suspicion and ask for a breakdown.

Why is a GST registration application rejected, and can I reapply?

Common causes are name or address mismatches, weak proof of premises, failed Aadhaar or physical verification and a missed REG-03 reply. You can reapply after fixing the cause, and you can appeal under Section 107 within three months. A fresh, clean application is usually the faster route.

Can I take GST registration voluntarily below the threshold?

Yes, under Section 25(3). It makes sense when business clients need your GST invoice, when the credit on your costs exceeds your filing cost, or when you will cross the limit soon. It does not make sense if your customers are mostly individuals who cannot claim the GST you would add.

Is Aadhaar authentication compulsory for GST registration?

It is optional on the standard track, but it speeds approval, and applications without it follow the 30-day verification track. It is mandatory under Rule 14A. If the portal flags you on risk parameters, you may be asked for biometric authentication and a photograph at a facilitation centre.

What happens if I cross the threshold and register late?

If you apply within 30 days of crossing, the registration takes effect from the day you crossed. If you apply later, it takes effect from the grant date, and the gap is a period in which you owed tax you could not charge. Interest and a penalty of at least ₹10,000 can apply. Applying promptly is cheaper than being found out.

What to do next

If you are unsure whether you must, should or should not register, work through the six-step framework above with your last 12 months of sales, then check your State's limit on the GST portal. If you want a person to do it with you, contact RegisCorp Consultancy LLP with your sales mix, States and PAN type. We will tell you which side of the line you are on before you pay for a filing. This post is general information, not legal or tax advice, and rules change often. Confirm the current position with a qualified professional before you act.

Sources and what we could not verify

Official sources we used.

• GST Council Secretariat newsletters: November 2025 issue (Rules 9A and 14A) at gstcouncil.gov.in, the October 2025 issue, and the August 2025 issue (56th Council meeting recommendations, including the 96% estimate)
• GST Council FAQ on changes from 22 September 2025
• CBIC text of Sections 22 and 24 of the CGST Act and Rules 9, 25 and 46 on the CBIC tax repository
• CBIC Instruction No. 03/2025-GST dated 17 April 2025
• GST Council copy of Notification 10/2019-Central Tax
• CBIC FAQs on registration, and the GST portal document checklist and QRMP FAQs
• GST Council reverse charge flyer

Secondary sources we used. Professional sites for Notification 34/2023-CT, Notification 10/2017-IT, Notification 65/2017-CT, Section 27, Rule 8, Rule 10, Rule 10A, Section 18, Rule 47, composition rules and the 57th Council reports.

What we could not verify on 9 October 2026.

• The text of Notification 18/2025-Central Tax. The number and date come from professional summaries, and we could not open the CBIC PDF.
• Whether a Rule 14A registrant is excluded from any category, whether B2C sales are fully outside the ₹2.5 lakh test, and how the portal defines "high risk".
• The exact list of special category States for the ₹10 lakh limit, and how it interacts with the ten-State exclusion in Notification 10/2019. Secondary sources conflict.
• The current list of States where biometric authentication under Rule 8(4A) applies.
• Whether the 57th Council recommendations of 8 October 2026 have been notified. We relied on press and professional reports.
• The GSTN advisory of 21 February 2026 on Rule 14A withdrawal, known to us only through professional summaries.
• Late fee caps, the 18% interest rate and the 0.5% e-commerce TCS rate, taken from secondary sources.
• The e-invoicing threshold date, HSN digit rule number and the composition position on e-commerce after October 2023.
• Whether the 1% composition rate applies to total or taxable turnover.
• That the portal charges no fee for registration. We found no fee provision, but no explicit official statement either.
• Whether the portal suspends registrations for missing Rule 10A bank details, reported by practitioners.
• Whether an officer treats unbilled sales as tax-inclusive or tax-exclusive, and which demand provision and penalty would apply.
• Whether a prior notice is required before physical verification.
• Our "plan for" timings in the timeline table, which are planning allowances and not measured data.
• That an unregistered service exporter cannot file a letter of undertaking or claim a credit refund without a GSTIN. We state this from how the process works, not from a rule we read.
• The reading of Instruction 03/2025-GST that officer delay should not produce deemed approval. We read a summary, not the full text.
• The three-month appeal window under Section 107, taken from two secondary sources that agree with each other.