How to File GST Returns as a Small Seller (GSTR-1 Basics)
Published: November 12, 2026
Source: www.gst.gov.in — official guidance
GSTR-1 is the return where you report your sales to the GST portal — the basic steps for a small seller.
Before you start
- Keep your GSTIN and GST portal login ready — you will need them to open the return.
- Keep all your sales invoices for the period ready and sorted, with buyer details where needed.
- Keep the phone with your registered mobile number nearby — the portal sends an OTP when you file.
Collect and check your sales invoices
Before you open the portal, gather all your sales invoices for the period and check them one by one: the buyer details, the invoice number, the date, and the tax charged. Fix any mistakes in your own records first — it is much easier to fix them now than after filing. If you keep your sales in a sheet, make a bill in Excel for each sale, so every invoice has the same details in the same place.
Separate your business sales from any personal transactions, and keep credit notes and debit notes together with the invoices they belong to. If you had no sales at all in the period, do not skip filing — you still need to file a nil return, and the portal has an option for that. Note down the total sales for the period so you can compare it with the portal's summary later.
Log in and open GSTR-1
Go to gst.gov.in and log in with your username and password. On the dashboard, go to Services, then Returns, then Returns Dashboard. Choose the financial year and the return period, click Search, and find the GSTR-1 tile. Click Prepare Online under it to start entering your sales on the portal itself.
If you have a large number of invoices, the portal also offers an offline tool — check the portal for it instead of typing every invoice by hand. If the GSTR-1 tile does not show up, check that you picked the right period, and that earlier periods are already filed, because the portal blocks the current period until earlier ones are done.
Enter your sales in the right sections
Now enter your sales in the right sections. Business-to-business invoices go in the B2B section with the buyer's GSTIN. Small sales to buyers without a GSTIN go in the small B2C sales section as a summary, not invoice by invoice. Exports and credit or debit notes go in their own sections — fill only the sections that apply to your sales.
Save each section as you go, so a lost connection does not wipe out your work. Check every buyer's GSTIN twice before you save, because a wrong GSTIN means your buyer cannot claim credit for that purchase. If a section does not apply to you, leave it blank — do not enter guesses to fill it up.
Check the summary, submit, and file
When all sections are filled, click Generate Summary and preview the full return. Download the preview if the portal offers it, and compare every figure with your own sales invoices and your period total. If anything does not match, go back and correct the tables — this is your last chance to fix mistakes.
If the summary matches, click Submit. After this step you cannot edit the data, so be sure before you click. Then file the return with EVC, using the OTP sent to your registered mobile number or email, or with a DSC if that applies to you. Save the acknowledgement and its reference number — it is your proof that the return was filed.
Tips
- File on time for your period — check the GST portal for the due date that applies to you, because it differs for monthly and quarterly filers.
- Match your GSTR-1 sales with your own sales register every period, so the two never drift apart.
- Keep a copy of every filed return and its acknowledgement — you will need them if the portal or a buyer asks questions later.
Keep in mind
- A filed GSTR-1 cannot be edited or revised — check everything before you click Submit.
- GST rates and due dates can change — always check the GST portal for the current rules instead of trusting an old guide.
- Never share your GST portal password or OTP with anyone. No real GST officer asks for them.
- If you are unsure which table a sale belongs in, check the GST portal's own help or ask a tax professional before filing — a wrong table can block your buyer's credit.
FAQs
What if I had no sales in the period?
You still have to file — choose the nil return option on the portal for that period. A period with no sales is called a nil return, and skipping it can cause problems later, so file it even when you sold nothing.
What is the difference between GSTR-1 and GSTR-3B?
GSTR-1 is the return where you report your sales. GSTR-3B is the return where you report your tax and pay it. File GSTR-1 first, because the sales figures from it flow into the other return — filing in this order keeps the two returns consistent.
What if I entered a wrong GSTIN or invoice?
You cannot change a return once it is filed. Correct the mistake in a later period's return as an amendment — check the GST portal for the amendment steps for your case. This is why checking the summary before you click Submit matters so much.
Can I file GSTR-1 offline?
Yes. The GST portal offers an offline tool for preparing invoice data in bulk, which helps if you have a large number of invoices. Check the GST portal's download section for the current tool, prepare your data in it, and upload the file it produces.
