GSTR-1 Filing: Due Dates, Format & How to File GSTR-1 on GST Portal

The GSTR-1 return under the Goods and Services Tax (GST) is a crucial compliance requirement for registered taxpayers. It captures details of all outward supplies made during a tax period. Timely and accurate filing of GSTR 1 is essential to ensure a smooth flow of input tax credit (ITC) and maintain transparency in transactions. In this comprehensive guide, we will walk you through the process of GSTR 1 filing, including due dates, format, and step-by-step instructions for GSTR1 online filing on the GST portal.

What is GSTR-1?

GSTR 1 is a monthly or quarterly return that captures details of all outward supplies made by a registered taxpayer. It includes:

• Invoices issued for goods and services

• Debit and credit notes

• Exports

• Advances received

• Other relevant sales data

The importance of GSTR-1 lies in two key aspects:

1. It determines the recipient’s ITC via auto-populated GSTR-2A and GSTR-2B.

2. It enables tax reconciliation and accurate tax payment through GSTR-3B.

Who Should File GSTR-1?

All registered taxpayers under GST are required to file GSTR 1, with a few exceptions:

• Composition scheme dealers

• Non-resident taxable persons

• Input Service Distributors (ISD)

• Taxpayers with nil outward supplies (in specific cases)

The filing frequency depends on the taxpayer’s annual aggregate turnover:

GSTR-1 Due Dates

Timely filing of GSTR 1 is crucial to avoid penalties and interest. The due dates for GSTR-1 filing are as follows:

Late filing attracts consequences:

• Late fee of ₹50 per day (₹25 CGST + ₹25 SGST)

• Interest at 18% per annum on the tax payable

• Possible blocking of e-way bill generation

Format & Contents of GSTR-1

The GSTR 1 format consists of 13 tables capturing various aspects of outward supplies:

1. B2B Invoices – Business-to-Business transactions

2. B2C (Large) – Interstate B2C invoices above ₹2.5 lakh

3. B2C (Small) – Other B2C supplies

4. Export Invoices

5. Credit/Debit Notes (Registered & Unregistered)

6. Nil Rated, Exempt, and Non-GST Supplies

7. Amendments to earlier returns

8. Advance Receipts

9. HSN-wise Summary

10. Document Issued Summary

The format supports both summary and invoice-level reporting, making accuracy paramount.

Prerequisites Before Filing GSTR-1

Before proceeding with the GSTR 1 filing process, ensure you have the following:

• Active GSTIN (Goods and Services Tax Identification Number)

• Valid login credentials for the GST portal

• Compiled sales data for the tax period, including:

  • B2B invoices with customer GSTINs

  • B2C invoices categorized by state and tax rates

  • Export invoices with shipping bill details

  • Credit/debit notes issued

  • HSN/SAC-wise summary of goods and services sold

• Functional digital signature certificate (DSC) or Aadhaar-based e-signing

How to File GSTR-1 on the GST Portal

Follow these step-by-step instructions for hassle-free GSTR1 online filing:

Step 1 – Log in to www.gst.gov.in

• Visit the official GST portal at www.gst.gov.in.

• Click on the “Login” button and enter your GSTIN and password.

Step 2 – Go to Returns Dashboard

• After logging in, navigate to the Returns Dashboard.

• Select the applicable financial year and return filing period.

Step 3 – Select GSTR-1 > Prepare Online

• From the Returns Dashboard, locate the tile for GSTR 1 return.

• Click on the “Prepare Online” button to initiate the filing process.

Step 4 – Enter Data in Each Section

• The online GSTR 1 form is divided into sections based on the nature of outward supplies.

• Carefully enter the required details in each section:

  • B2B invoices

  • B2C (Large) invoices

  • B2C (Small) invoices

  • Exports

  • Credit/Debit notes

  • Nil rated, exempt, and non-GST supplies

  • Amendments to earlier returns

  • Advance receipts

  • HSN-wise summary

  • Document issued summary

• Validate the entries to ensure accuracy and completeness.

Step 5 – Preview and Submit

• After entering all the data, click on the “Preview” button to review the draft GSTR1.

• Carefully verify the details entered in each section.

• If everything is correct, click on the “Submit” button.

• Authenticate the submission using your DSC or Aadhaar-based e-signing.

Step 6 – Download Acknowledgment

• Upon successful submission, an acknowledgment message will be displayed.

• Download and save the acknowledgment receipt for future reference.

For taxpayers with a large volume of invoices, the offline utility or GST-compliant accounting software can simplify the process through bulk uploads and auto-population of data.

Common Mistakes to Avoid in GSTR-1 Filing

To ensure error-free GSTR-1 filing, steer clear of these common mistakes:

1. Incorrect GSTINs: Verify customer GSTINs using the GST portal before entering them.

2. Duplicate Invoice Numbers: Maintain a proper invoice series in your accounting software to avoid duplication.

3. Mismatched Invoice Dates: Ensure invoice dates fall within the current return period.

4. HSN Code Errors: Refer to the correct HSN code list for each product or service.

5. Missing Exports or Advances: Keep a checklist of all supply types to avoid omissions.

Using GST-compliant software like BUSY can help prevent these errors through real-time validation, pre-filled fields, and automated summaries.

GSTR-1 Filing via Offline Tool (Optional Section)

For taxpayers with a large volume of invoices, the GST offline tool can simplify the GSTR 1 preparation process:

1. Download the offline utility from the GST portal.

2. Install and open the utility on your computer.

3. Enter the required data in the Excel template provided.

4. Validate the entries to ensure accuracy.

5. Generate the JSON file and upload it to the GST portal.

6. Verify and submit the GSTR1 using DSC or Aadhaar-based e-signing.

The offline tool is particularly helpful for bulk data entry and minimizing manual errors.

Can GSTR-1 Be Revised?

Once submitted, the GSTR-1 return cannot be revised. However, amendments can be made in the subsequent period’s return:

• Use the relevant amendment tables (e.g., B2B Amendment, Credit Note Amendment)

• Provide the original invoice details along with the amended values

• Ensure the amendment is made in the return immediately following the error discovery

Timely amendments are crucial to maintain accurate records and avoid discrepancies in the recipient’s ITC claims.

Conclusion

Filing GSTR 1 is a vital compliance requirement under GST, enabling transparency, seamless ITC flow, and tax reconciliation. By understanding the due dates, format, and GSTR 1 steps, taxpayers can ensure timely and accurate filing.

To streamline the GSTR 1 filing process, consider using GST-compliant accounting software like BUSY, which automates data compilation, validates entries, and generates the GSTR1 in the prescribed format. Stay vigilant of common errors and make necessary amendments promptly to maintain compliance.

By following this comprehensive guide and leveraging the right tools, you can navigate the GSTR-1 return filing process with ease and confidence.

Frequently Asked Questions (FAQs)

Q1. Who is exempt from filing GSTR-1?

The following taxpayers are exempt from filing GSTR 1:

• Composition scheme dealers

• Non-resident taxable persons

• Input Service Distributors (ISD)

• Taxpayers with nil outward supplies (in specific cases)

Q2. What happens if I miss the GSTR-1 deadline?

Late filing of GSTR-1 attracts the following consequences:

• Late fee of ₹50 per day (₹25 CGST + ₹25 SGST)

• Interest at 18% per annum on the tax payable

• Possible blocking of e-way bill generation

Q3. Can I file GSTR-1 quarterly?

Taxpayers with an annual aggregate turnover of up to ₹5 crore can opt for the Quarterly Return Monthly Payment (QRMP) scheme and file GSTR 1 quarterly. The due date is the 13th of the month following the quarter.

Q4. Is it mandatory to file GSTR-1 if there are no sales?

Yes, even if there are no outward supplies during a tax period, taxpayers must file a nil GSTR1 return to maintain compliance.

Q5. Can I make corrections after submission?

While GSTR-1 cannot be revised once submitted, amendments can be made in the subsequent period’s return using the relevant amendment tables. Ensure amendments are made promptly to avoid discrepancies.

Q6. What’s the difference between GSTR-1 and GSTR-3B?

GSTR 1 is a detailed return capturing outward supplies, while GSTR-3B is a summary return for declaring aggregate values of sales, ITC, and tax payable. Taxpayers must file both returns as per the prescribed due dates.

Remember, timely and accurate filing of GSTR-1 is crucial for maintaining GST compliance, ensuring a smooth flow of ITC, and fostering transparency in business transactions.