GST Return Filing Guide for Small Businesses in India 2025–26

GST Returns — Which Ones Does a Small Business File?

The returns you must file depend on your registration type and annual turnover. Most small businesses fall into three categories:

GSTR-2A and GSTR-2B are auto-generated based on your suppliers' GSTR-1 filings — you do not file these, but you must reconcile your purchase records with GSTR-2B before claiming Input Tax Credit (ITC).

Deadlines for Each Return

GSTR-1 — Outward Supply Return

GSTR-1 records every invoice you have issued to GST-registered buyers (B2B) and a consolidated summary of invoices to unregistered buyers (B2C). Details you must enter:

• B2B invoices: GSTIN of buyer, invoice number, date, taxable value, GST rate, and tax amount. These flow into the buyer's GSTR-2B for their ITC claim — errors here affect your buyers.
• B2C large invoices: Interstate supplies to unregistered persons where the invoice value exceeds Rs 2.5 lakh — reported individually.
• B2C small invoices: All other B2C supplies — reported as state-wise aggregates by HSN code.
• Credit/debit notes: Any amendments to earlier invoices.
• HSN summary: Aggregate supply value by HSN code (mandatory for all taxpayers from FY 2022–23).

File GSTR-1 before GSTR-3B — once filed, GSTR-3B auto-populates outward tax liability from your GSTR-1 data.

GSTR-3B — Summary Return and Tax Payment

GSTR-3B is a self-declaration summary. You report:

• Total outward taxable supplies and tax (from GSTR-1)
• Total ITC available (from GSTR-2B)
• ITC being reversed (for ineligible credits)
• Net tax payable after ITC set-off

The tax payable in GSTR-3B must be paid in full before filing. Late payment attracts interest at 18% per annum from the due date. Once filed, GSTR-3B cannot be revised — corrections must be made in the next period's return (with proper disclosure).

The most common GSTR-3B mistake: claiming ITC that does not appear in GSTR-2B. The GST portal now flags ITC mismatches. Claim only what is in your GSTR-2B and follow up with suppliers who have not filed their GSTR-1 on time.

Composition Scheme — Is It Right for Your Business?

The Composition Scheme simplifies compliance but has significant restrictions:

• Who can opt in: Manufacturers, traders, and restaurants with aggregate turnover up to Rs 1.5 crore (Rs 75 lakh in special category states). Service providers (other than restaurants) can opt in up to Rs 50 lakh under the special composition scheme at 6%.
• Tax rate: 1% on turnover for traders (0.5% CGST + 0.5% SGST), 5% for restaurants, 6% for service providers.
• Cannot do: Supply goods or services outside the state, supply non-taxable goods, make e-commerce supplies, collect GST from customers, or claim ITC.
• Must display: "Composition Taxable Person, not eligible to collect tax on supplies" on every bill of supply.

The composition scheme suits businesses with high turnover but low margins on purchases — a grocery store with mostly local customers is a good fit. It does not suit businesses that buy from GST-registered suppliers and want to claim ITC.

Penalties for Late GST Filing

• GSTR-3B late fee: Rs 50 per day (Rs 25 CGST + Rs 25 SGST), capped at Rs 10,000 per return. Nil returns: Rs 20 per day, capped at Rs 500.
• GSTR-1 late fee: Rs 50 per day (nil returns: Rs 20 per day). Cannot file GSTR-3B without filing GSTR-1 first.
• Interest: 18% per annum on unpaid tax from the due date. Applies even if you file on time but pay later.
• ITC reversal: If your supplier does not file GSTR-1 for 2+ years, ITC already claimed must be reversed with 24% interest.
• Registration cancellation: Non-filing for 6 consecutive months (regular taxpayer) or 3 consecutive quarters (composition) can lead to cancellation of GST registration.

Frequently Asked Questions