GSTR-1 is the cornerstone of GST compliance for outward supplies. It is the return through which every registered taxpayer reports details of all sales made during a tax period. An error in GSTR-1 does not just affect the supplier—it cascades down to the buyer, who may lose Input Tax Credit (ITC) until the error is corrected.
This comprehensive guide covers the due dates, format, step-by-step filing process, common errors, and rectification mechanisms for GSTR-1.
What Is GSTR-1?
GSTR-1 is a monthly or quarterly return that contains details of all outward supplies made by a registered taxpayer. It captures:
- B2B supplies (business-to-business transactions)
- B2C supplies (business-to-consumer transactions)
- Exports and deemed exports
- Credit notes and debit notes
- Advances received and adjustments
Due Dates for GSTR-1
Monthly Fliers
Taxpayers with an aggregate turnover exceeding ₹5 crore in the preceding financial year must file GSTR-1 monthly, by the 11th of the following month.
Quarterly Fliers (QRMP Scheme)
Taxpayers with aggregate turnover up to ₹5 crore who have opted for the QRMP (Quarterly Return Monthly Payment) scheme must file GSTR-1 quarterly, by the 13th of the month following the quarter.
| Filer Type | Due Date |
|---|---|
| Monthly (Turnover > ₹5 Cr) | 11th of following month |
| Quarterly (QRMP, Turnover ≤ ₹5 Cr) | 13th of following month |
Critical Note: Taxpayers cannot file GSTR-1 beyond three years from the relevant due date of such GSTR-1 for a tax period, as per the amendment to Section 37 of the CGST Act.
GSTR-1 Format and Structure
GSTR-1 is divided into multiple tables covering different types of supplies:
- Table 1-3: Basic details and amendments
- Table 4-6: B2B, B2C, and export supplies
- Table 7-9: Credit notes, debit notes, and amendments
- Table 10: Advances received
- Table 11-12: HSN-wise summary and document-wise summary
Step-by-Step GSTR-1 Filing Process
Step 1: Prepare Data
- Compile all sales invoices for the tax period
- Verify GSTINs of all B2B customers
- Ensure HSN codes are correctly classified
Step 2: Log in to GST Portal
- Visit www.gst.gov.in
- Navigate to Services > Returns > Returns Dashboard
Step 3: Select GSTR-1
- Select the financial year and tax period
- Click on "Prepare Online" or use the offline utility
Step 4: Fill Details
- Enter details in each table
- Upload invoices (if using offline utility)
Step 5: Preview and Validate
- Preview the return
- Check for errors and warnings
Step 6: Submit
- File using DSC or EVC
Common Errors in GSTR-1 Filing
1. Incorrect GSTIN
An error in GSTIN means the invoice goes to the wrong GSTIN or floats unmatched—the buyer loses ITC until you amend.
2. Misclassification of Supplies
Misclassifying an SEZ supply as regular B2B, or reporting an export as B2C, is a common error that attracts IGST refund complications and notices from the jurisdictional officer.
3. Invoice Date Errors
- Invoice date precedes the customer's GST registration date
- Shipping bill date is outside the valid range (must be on or after the invoice date, on or before the filing date)
4. HSN Code Errors
Incorrect or missing HSN codes lead to mismatches and potential notices.
5. Duplicate Invoices
Accidentally reporting the same invoice twice creates discrepancies.
6. Missing Invoices
Omitted invoices mean the buyer cannot claim ITC.
7. Credit/Debit Note Errors
Incorrect reporting of credit notes or debit notes affects both supplier and recipient.
How to Correct GSTR-1 Errors
Option 1: Amend in Subsequent Return
Under Section 37(3), errors found in GSTR-1 can be rectified in subsequent periods. Taxpayers are provided with the facility to amend invoice details reported in an earlier tax period by furnishing the correct particulars in a subsequent return.
Option 2: Use GSTR-1A (if available)
GSTR-1A lets taxpayers add missed invoices before GSTR-3B is filed.
Option 3: Report in Amendment Tables
Use the amendment tables in the current month's/quarter's GSTR-1 to correct errors from previous periods.
Late Fee for GSTR-1
Late filing of GSTR-1 attracts a late fee of ₹50 per day (₹25 CGST + ₹25 SGST). For nil returns, the late fee is ₹20 per day (₹10 CGST + ₹10 SGST).
GSTR-1 Filing Checklist
- All sales invoices are accounted for
- GSTINs of all B2B customers are verified
- HSN codes are correctly classified
- Exports are correctly reported
- Credit notes and debit notes are properly adjusted
- Advances received are reported
- Preview and validate before submission
Struggling with GSTR-1 filing or facing notices for errors? Our expert team provides comprehensive GSTR-1 preparation, review, and filing services to ensure error-free compliance.
Contact Anuj Desai & Associates: 📧 Email: office@anujdesaiassociates.com 📞 Phone: 9619456656 🌐 Website: https://anujdesaiassociates.com 🔗 LinkedIn: linkedin.com/in/ca-anuj-desai-122547230