Registering your firm under the Partnership Act does not register it for GST. They are two separate things.
This guide helps you decide three things: whether you need GST, which scheme suits you, and what you must file and when. It does not cover filing steps or income tax. Examples are for a firm in Tamil Nadu.
When does your partnership firm need GST registration?
| Your business | Register when… |
|---|---|
| Only goods eligible for the ₹40 lakh limit | Total turnover crosses ₹40 lakh, unless compulsory registration applies earlier |
| Services, or goods and services together | Total turnover crosses ₹20 lakh, unless compulsory registration applies earlier |
| Selling taxable goods to another State | Before you start, even if turnover is low |
| Certain purchases where you pay the GST instead of the supplier (called "reverse charge") | When it applies, even if turnover is low |
Registration points to remember
Turnover means your total turnover in India under the same PAN. Branches do not get separate limits.
A few goods, such as ice cream, pan masala and tobacco products, do not get the ₹40 lakh limit.
Buying goods from another State does not need registration. Selling taxable goods to another State usually does. A few specific exemptions exist, for example for certain handicraft goods.
Selling services to another State does not, by itself, need registration.
Exporting goods generally needs registration before you start, so you can claim refunds. A service exporter below the limit does not have to register, but may choose to in order to claim refunds on purchases.
If you supply only exempt items, registration is generally not needed. Review this the day you add a taxable item.
When is voluntary GST registration useful?
| Register early if… | Voluntary registration may offer limited benefit if… |
|---|---|
| Your customers are GST-registered businesses who want GST invoices | Your customers are mostly ordinary consumers |
| You pay a lot of GST on purchases and want to claim it back | Your purchases carry little or no GST |
| You export services and want refunds | You are well below the limit and growing slowly |
These considerations apply only where registration is optional. They do not override compulsory registration.
For the deed and registration requirements, see how to register a partnership firm in Chennai.
Should your firm choose regular GST or composition?
This choice affects your tax cost and customer pricing. A new firm can choose composition when registering. An existing regular firm must apply before the financial year in which it wants composition to begin.
| Regular scheme | Composition scheme | |
|---|---|---|
| GST rate | Applicable rate; many services attract 18% | Applicable composition rate: 1% traders and manufacturers, 5% restaurants, 6% service providers |
| Collect GST separately from customers? | Yes | No |
| Claim GST paid on purchases? | Yes, where eligible | No |
| Turnover limit | None | ₹1.5 crore (goods) or ₹50 lakh (services) in the last year |
| Sell to other States or export? | Yes | No |
| Customer can claim credit? | Yes, where eligible | No |
| Invoice type | Tax invoice | Bill of supply |
A simple example for 2026–2027. Assume your firm qualifies for the 6% service composition scheme, the same services attract 18% under regular GST, customers pay ₹1,18,000 in total, and there is no purchase credit or reverse-charge tax.
| Regular (18%) | Composition (6%) | |
|---|---|---|
| Received from customers | ₹1,18,000 | ₹1,18,000 |
| GST to pay | ₹18,000 | ₹7,080 |
| Left with you, before expenses | ₹1,00,000 | ₹1,10,920 |
Composition leaves you ₹10,920 more at the same price. You could instead lower your price and stay competitive.
Conditions to remember
Composition tax is still a cost of your business. Build it into your prices.
If you cross your limit during the year, you must leave composition from that date.
All GST registrations under the same PAN must follow the same choice.
Which GST scheme suits your customers and costs?
| If your firm… | Lean towards |
|---|---|
| Sells mainly to consumers and pays little GST on expenses | Composition |
| Sells mainly to GST-registered businesses | Regular |
| Sells to other States or exports | Regular |
| Pays a lot of GST on rent, software, equipment or subcontractors | Regular |
| May cross ₹50 lakh / ₹1.5 crore soon | Regular (avoids a forced switch mid-year) |
The composition guide explains whether the GST composition scheme suits your business.
Monthly filing or QRMP: what changes?
The GST rate and credit rules stay the same under both options. What differs is how often you file, when you pay tax and how often invoice details reach your customers.
| Monthly | Quarterly (QRMP) | |
|---|---|---|
| Who can use it | Any regular firm | Turnover up to ₹5 crore |
| Returns | GSTR-1 and GSTR-3B every month | GSTR-1 and GSTR-3B every quarter |
| Tax payment | With the monthly return | Monthly deposit in the first two months of each quarter, where required |
| Invoice details reach customers | Every month, through GSTR-1 | Quarterly, or monthly through optional IFF |
IFF (Invoice Furnishing Facility). QRMP firms can use this optional facility to report eligible registered-customer invoices in the first two months of a quarter. It helps customers receive invoice details for their credit claims without waiting until quarter-end. IFF is normally due by the 13th of the following month. Invoices reported through IFF must not be reported again in the quarterly GSTR-1.
Should your firm choose monthly filing or QRMP?
Many invoices and you prefer a fixed monthly routine: monthly.
Fewer invoices and you want less paperwork: quarterly, using IFF if business customers need invoices reported early.
The QRMP guide explains whether your business should choose monthly GST filing or QRMP.
GST calendar for financial year 2026–2027
| Return | Who files | What it is | Normal due date |
|---|---|---|---|
| GSTR-1 | Regular, monthly | Sales invoices | 11th of next month |
| GSTR-3B | Regular, monthly | Tax payable and credit claimed | 20th of next month |
| IFF (optional) | QRMP, first two months | Early invoice reporting | 13th of next month |
| Monthly tax payment | QRMP, first two months | Tax deposit | 25th of next month |
| GSTR-1 (quarterly) | QRMP | Sales invoices | 13th of the month following the quarter |
| GSTR-3B (quarterly) | QRMP, Tamil Nadu | Tax and credit | 22nd of the month following the quarter |
| CMP-08 | Composition | Quarterly tax payment | 18th of the month following the quarter |
| GSTR-4 | Composition | Annual return | 30 June 2027 |
| GSTR-9 / GSTR-9C | Regular, where applicable | Annual return and reconciliation | 31 December 2027 |
| GSTR-10 | Regular taxpayers whose registration is cancelled (not composition) | Final return | Within 3 months of the cancellation date or order, whichever is later |
These are normal deadlines. The government can extend them. Annual-return exemptions change from year to year, so do not assume last year's exemption applies.
Remember: filing GSTR-1 alone is not enough. A regular firm must also file GSTR-3B.
For professional assistance, see our GST return filing services in Chennai.
GST obligations when partners or business activities change
A partner joins or retires. Update your GST registration within 15 days, with the new partnership deed. If the same firm continues under the same PAN, the partner change alone does not require a new GSTIN. If the retiring partner was the authorised signatory, appoint a new one.
Choose an available authorised signatory. Someone usually present at the main place of business is a practical choice for handling GST communications and verification.
A retiring partner should review pending returns and GST dues. Partners remain jointly responsible with the firm for tax, interest and penalties relating to their time as partners, even if these amounts are determined after retirement. The firm or retiring partner must also notify the Commissioner in writing within one month of retirement. Without timely notice, the retiring partner's liability continues until the notice is received.
Business is quiet. Returns are still due while your registration is active, even with no sales. If purchases or tax details exist, the return is not a "nil" return.
You close the business. Apply for GST cancellation, file pending returns, pay dues, and file the final return (GSTR-10) if you are a regular taxpayer. Closing the firm does not cancel GST. Cancelling GST does not close the firm. Do both.
When partners change, check how to add or retire a partner without closing the firm.
Other GST requirements to remember
Plan the business address before signing the partnership deed. Before registering the firm, compare the proposed address with the rental agreement and electricity bill or other address proof intended for GST registration. Use consistent building, door-number, street and PIN-code details for the same premises in the deed and GST application. This can prevent avoidable address queries later.
If the deed has already been signed, correct any genuine error before applying for GST. If the firm has moved from the address stated in its deed, prepare an amendment deed and update the firm's registration records where required. A minor difference in how the same address is written does not, by itself, mean the firm has changed premises; keep supporting documents that clearly identify the location.
Partners' names should match their PAN and Aadhaar records to avoid identity-verification mismatches.
Branches in the same State. You can add branches as additional places of business under one GST registration or obtain separate registrations, subject to the applicable conditions. Separate registrations require separate returns, and transfers between those registrations can attract GST. An SEZ unit requires a separate registration from a unit outside the SEZ.
Review purchase credit. For ordinary domestic purchases, compare your invoices with GSTR-2B. An invoice appearing there does not automatically make its GST eligible for credit. Imports and reverse-charge purchases have separate requirements.
Issue the right document. Regular firms issue tax invoices. Composition firms issue a bill of supply and must not charge GST separately.
E-invoicing. It generally applies to covered business-customer and export documents where turnover exceeded ₹5 crore in any preceding financial year from 2017–18 onwards. Certain businesses are exempt.
File even when there is nothing to report. Late filing can attract a daily late fee, subject to the applicable limits and relief. Delayed tax payment can also attract interest.
Keep GST records for six years from the annual-return due date for the relevant year. Keep them longer if a dispute is ongoing.
GST mistakes to avoid
Selling taxable goods to another State without registering.
Staying in composition after crossing the limit.
Filing GSTR-1 but not GSTR-3B.
Not updating GST after a partner change.
Closing the business but leaving the GST registration open.
For the firm's income tax obligations, see which income tax filings apply to a partnership firm.