India had more than 1.51 crore active Goods & Service Tax (GST) registrations[1] as of April 2025, making return filing even more important. Again, as your business joins the system, you will have to keep filing on time. This helps you avoid penalties and makes your business more reliable.
GSTR-1 is the most important of all the GST returns. You can record your outward supplies simply and cleanly. Most importantly, your purchasers rely on this data to assert Input Tax Credit (ITC). In this blog, you will learn what GSTR-1 is, its due dates, filing process, common mistakes to avoid, and more.
Under the GST system, registered taxpayers file GSTR 1 every month or every three months. It shows all the goods and services that were sold during a certain tax period. This comprises invoices from one business to another (B2B), sales summaries from one business to a consumer (B2C), exports, credit notes, debit notes, and advances received.
The accuracy of GSTR-1 is important for more than just your personal compliance. The information you give in GSTR-1 goes into your buyer’s GSTR-2A and GSTR-2B. Your customer can’t claim ITC on that purchase if your data is wrong or missing. This makes GSTR-1 an important part of the whole GST supply chain.
All registered taxpayers under the conventional GST scheme must file GSTR-1, even if they didn’t do any business during that time. To avoid late costs, you must still file a NIL return even if there were no sales.
But the following groups of taxpayers don’t have to file GSTR-1:
The due date for GSTR 1 depends on how often you file: monthly or quarterly.
Businesses that file monthly (those with an annual turnover of more than ₹5 crore or those who haven’t signed up for the Quarterly Return Monthly Payment (QRMP) scheme) must file GSTR-1 by the 11th of the month after the one in which they filed. The GSTR-1 for March 2026, for example, is due by April 11, 2026.
Businesses having total sales of up to ₹5 crore that file quarterly under the QRMP scheme file GSTR-1 once every three months. The due date is the 13th of the month after the quarter ends. For example, the return for the first three months of 2026 is due by April 13, 2026.
Even with the QRMP plan, taxpayers still have to enter their B2B invoices each month through the Invoice Furnishing Facility (IFF) by the 13th of each month for the first two months of a quarter. This enables buyers to get their ITC without any problems.
There are many tables in GSTR 1; each is meant to record a different type of outbound supply. Here is a list of the most important tables:
Below is a detailed, step-by-step guide to filing your GSTR in India:
If your firm has more than 500 invoices in each division, you should use the offline tool. You can have the data ready in Excel or CSV format, use the GST Returns Offline Tool to change it into a JSON file, and then upload it through the portal.
If there is a late fee for the GSTR 1 deadline, you will automatically be fined. The late charge rules in Section 47 of the CGST Act, 2017, are as follows:
In case of returns with tax dues, a late fee of ₹50 per day (₹25 for CGST and ₹25 for State GST (SGST)) is applicable, subject to a maximum of ₹5,000 per act (₹10,000 for CGST and SGST together).
The penalty for NIL returns is less: ₹20 per day (₹10 for CGST + ₹10 for SGST)
In addition to the late fee, an interest of 18% per year is added on unpaid taxes, counting from the day after the due date until the day of payment. Since the gateway does not take care of that for you, you have to determine and pay the interest by yourself.
GSTR-1 due date delays might lead to loss of your purchasers’ ITC claims, reduction in your GST Compliance Rating, inability to create e-way bills, suspension/cancellation of GST registration, and more.
Even people who have filed GSTR-1 before make mistakes. These are the mistakes that people most often make and how to avoid them.
Missing Buyer’s GSTIN
If the buyer’s GSTIN has even one typo, the invoice fails to appear in their GSTR-2A. This prevents them from claiming their ITC. Check the buyer’s GSTIN before sending an invoice, and once again when you enter it into the system.
Duplicate Invoice Entries
This is very common when you combine data from more than 1 excel sheet manually. Reconciliations will trigger issues, and your turnover will appear larger than it is. Ensure that invoice numbers can be grouped in a uniform manner and de-duplicated prior to upload.
Misclassification of Interstate and Intrastate Supplies
It’s common to make the mistake of using IGST on an intrastate supply or CGST/SGST on an interstate delivery. Make sure you enter the Place of Supply (POS) code accurately. The POS must be different from the supplier’s state for supplies between states. They must match suppliers within the same state.
Not Filing NIL Returns
Many people think that GSTR-1 doesn’t need to be reported if there are no transactions. This is not right. For periods with no outward supplies, every registered taxpayer must file a NIL return. If you don’t do this, you’ll have to pay late fines, even if you don’t owe any taxes.
Failing to Record Credit and Debit Notes
When you provide credit or debit notes, you are modifying the ground value of a supply. Not recording them will lead to a mismatch with GSTR-1 and GSTR-3B. As a result, there will be differences in your returns.
Hence, you are required to disclose all of these changes in Table 9 of GSTR-1. This ensures that your data stays both valid and uniform.
Once the GSTR 1 is filed, it cannot be changed. However, the GST compliance system provides you with two options for rectifying discrepancies. Therefore, you can still avoid errors before they become a problem.
You can refer to GSTR-1A for the same-period adjustments. Such an option was made effective via the CGST update in Jul 2024. This allows you to make corrections to GSTR-1 prior to GSTR-3B filing. When you do that, you can catch errors and rectify them early.
Then, in the following period, GSTR-1 errors can be rectified. You are required to report variations against the appropriate amendment tables. Also, the original invoice that this is being billed against needs to be properly referenced. That way, your correction is sure to be accepted.
Drafts of GSTR-3B can be edited only till the filing date. Note that after filing, GSTR-3B cannot be amended from July 2025 onwards. Therefore, you have to make all the necessary alterations in the GSTR-1 or GSTR-1A. That keeps you from making irreversible mistakes.
Keeping your GSTR 1 record clean does more than just keep you in line. It makes your buyers trust you more because they need you to file their ITC claims on time. It keeps you safe from audit letters, fines, and business issues, such as e-way bill blocking. Most significantly, if you have a long history of filing proper GST taxes, it will help your credit score when you ask for credit.
Lenders are increasingly looking at GST return data to see if a business’s turnover is steady, if it pays its taxes on time, and if it can pay back the loan. This is because firms want to get working capital without putting up security. DMI Finance offers business loans of up to ₹25 lakh to Micro, Small, and Medium Enterprises (MSMEs) all throughout India. The application process is completely digital. You can apply for a business loan and get the funds within 24 to 72 hours of getting approval. Click here to apply.
1. Is it possible to file GSTR-1 before GSTR-3B for the same time period?
Yes. GSTR-1 must be filed before GSTR-3B because GSTR-3B uses data from GSTR-1, and you cannot file it without completing GSTR-1 first.
2. Is there a limit to the number of invoices I may add directly to the GST portal?
You can enter and view up to 500 invoices per section on the GST portal. If you have more, you must use the Offline Tool and upload the data in JSON format.
3. Is it possible to file my GSTR-1 every month and every three months during the year?
You can choose the QRMP scheme at the start of a quarter. However, you cannot change this option in the middle of the quarter.
4. How do GSTR-1 and e-invoicing work together?
Businesses that make more than ₹5 crore a year must use e-invoicing. When you make an e-invoice via the Invoice Registration Portal (IRP), the B2B invoice data is automatically added to your GSTR-1. This reduces the need to enter data by hand and reduces the likelihood of mistakes, but you still need to check the auto-populated information before filing.
5. Does GSTR-1 simply show sales, or does it also show purchases?
GSTR-1 only shows outward supplies like sales, exports, and credit or debit notes. Purchase details are reflected separately in GSTR-2A, GSTR-2B, and GSTR-3B.
6. Is it possible to use the Input Tax Credit to pay late fees for GSTR-1?
No, you can only pay late fees through the Electronic Cash Ledger. The Electronic Credit Ledger has an Input Tax Credit (ITC), but you can’t use it to pay late fees. You have to pay the full amount in cash before you can file your return.
7. What happens to GSTR-1 returns that are still open but are more than three years old?
Starting in July 2025, GST returns that are more than three years past due will be permanently barred from the platform. For instance, you couldn’t file monthly returns that were due in June 2022 after June 2025. You need to clear any old pending returns before the three-year deadline.
8. How does the information in GSTR-1 affect my GST compliance rating?
Your compliance rating depends on the timely and accurate filing of GSTR-1. Delays or errors can lower your rating and affect your credibility.
9. If my GST registration was cancelled, can I still file a GSTR-1 return for a time period that has already passed?
If your registration was cancelled but then restored by a revocation order, you must file all of your pending returns, including GSTR-1, for the time when the registration was valid. But if the cancellation stays in place and no revocation is given, the portal won’t let you file returns for those times.
10. Should I include reverse charge transactions in GSTR-1?
Yes, reverse charge supplies must be reported in GSTR-1. They should be correctly shown under the relevant section to avoid errors.
| GST Rates Universe | ||
| GST on e-Commerce | GST on Luxury Goods & Services | GST on Restaurants |
| GST on Professional Services | GST on Hotels | GST on Insurance |
| GST on Education | GST on Imports | GST on Personal Loans |
