Key Takeaways
- GSTR-3B is a self-declared summary return used to pay tax and claim ITC.
- Monthly filers: 20th of the next month. QRMP filers: 22nd or 24th based on state.
- Late filing attracts ₹50/day (₹20/day for NIL) plus 18% p.a. interest on dues.
- File NIL returns even in zero-activity months to maintain continuous filing compliance.
If you are registered under GST, filing GSTR-3B is one of your most critical monthly or quarterly responsibilities. Missing deadlines can lead to heavy penalties, interest, and even GSTIN suspension.
This guide simplifies the filing process, covering due dates, late fees, ITC rules, and step-by-step filing for 2026.
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How to Log In to the GST Portal
Before you can file GSTR-3B, you need to log in to the official GST portal. Here's how:
GST Portal Login Steps
- Visit the GST portal: Go to www.gst.gov.in (the official Goods and Services Tax portal for India)
- Click "Login" in the top-right corner
- Select your user type:
- GSTIN/UIN: Enter your 15-digit GSTIN (GST Identification Number) or UIN
- User ID: Use your registered user ID or email address
- Password: Enter your GST portal password
- Two-Factor Authentication: Enter the OTP sent to your registered mobile number
- Dashboard Access: Once logged in, you'll access the GST dashboard where you can file GSTR-3B, GSTR-1, and manage your compliance
First-Time GST Portal Login or Password Reset
- If you're filing for the first time, register at www.gst.gov.in/user/register
- If you forgot your password, click "Forgot Password" and verify via OTP
- Ensure your GSTIN is activated by the tax authorities before filing
- For registration assistance, contact your state GST office or download the GST portal help manual
Key GST Portal Features for GSTR-3B Filing
- Secure Login: 2FA authentication protects your GST account
- Offline Tools: Download offline utilities to generate invoices before uploading
- Form Pre-fill: GSTR-3B data auto-populates based on your GSTR-1 and GSTR-2A entries
- Real-time Filing Status: Track your GSTR-3B submission and processing status instantly
What is GSTR-3B?
GSTR-3B is a self-declared summary return. Unlike GSTR-1, which focuses on sales details, GSTR-3B is where you finalize your numbers and pay the tax due to the government.
In this return, you declare:
- Outward Supplies: Total sales and tax collected.
- Inward Supplies: Purchases subject to Reverse Charge.
- Input Tax Credit (ITC): Tax paid on business purchases you are claiming.
- Tax Payment: The net amount paid after offsetting liability with credits.
Who is Required to File?
GSTR-3B filing is mandatory for all normal taxpayers and casual taxable persons.
Note on Inactive Businesses: Even if you had zero business activity during the period, you must file a NIL return to avoid late fees.
GSTR-3B Due Dates (2026 Rules)
Monthly Filers
For taxpayers with an annual turnover exceeding ₹5 crore or those who haven't opted for QRMP:
- Due Date: 20th of the following month.
- Example: Your March 2026 return is due by April 20, 2026.
Quarterly Filers (QRMP Scheme)
Small businesses with turnover up to ₹5 crore can file quarterly but must pay tax monthly using form PMT-06 by the 25th of the following month.
- Category A states: 22nd of the month following the quarter
- Category B states: 24th of the month following the quarter
Penalties and Interest
Late Fees
- Standard Filing: ₹50 per day (₹25 CGST + ₹25 SGST).
- NIL Return Filing: ₹20 per day.
- Maximum late fees are capped based on your turnover slab.
Interest on Late Payment
If you fail to pay the tax liability by the due date:
- Rate: 18% per annum.
- Calculation: Interest is calculated on the net tax liability (cash ledger portion only).
Input Tax Credit (ITC) Rules
ITC is a powerful tool to reduce your tax burden, provided it is used correctly.
Key Requirements
- You must possess a valid tax invoice.
- The supplier must have uploaded the invoice (check your GSTR-2B).
- Utilisation must follow a strict order:
- IGST Credit: Offsets IGST, then CGST or SGST.
- CGST Credit: Offsets CGST, then IGST (not SGST).
- SGST Credit: Offsets SGST, then IGST (not CGST).
Step-by-Step Filing Process
Step-by-Step Guide
How to File GSTR-3B on the GST Portal
Follow these 6 steps to complete your GSTR-3B return filing accurately
Portal Login
Visit the official GST portal and log in with your GSTIN credentials.
gstin.gov.inReturns Dashboard
Navigate to Returns Dashboard, select the financial year and return period.
NavigationData Entry
Enter summarised sales, purchase, and ITC details. Verify auto-populated data from GSTR-1 and GSTR-2B.
Key StepConfirm Liability
Review the system-calculated tax payable and cross-check against your books.
VerificationOffset & Payment
Use your electronic credit ledger to offset liability. Pay any remaining balance via Net Banking, UPI, or NEFT.
PaymentVerification & Submit
Submit the return using EVC (OTP) or Digital Signature Certificate (DSC).
Final StepSource: GST Portal Filing Procedure : CGST Rules, 2017
- Portal Login: Visit the official GST portal and log in.
- Dashboard: Navigate to Returns Dashboard, select the financial year and period.
- Data Entry: Enter summarized sales, purchase, and ITC details. Verify auto-populated data from GSTR-1 and GSTR-2B.
- Confirm Liability: Check the system-calculated tax payable.
- Offset & Payment: Use your electronic credit ledger. Pay any balance via Net Banking, UPI, or NEFT.
- Verification: Submit using EVC (OTP) or Digital Signature Certificate (DSC).
Practical Tips and Common Mistakes
Tips for Efficiency
- Reconcile Monthly: Match books with GSTR-2B to ensure no ITC is missed.
- File Early: Avoid the 20th-day rush to prevent portal downtime.
- Use SMS for NIL: File NIL return instantly via SMS from your registered mobile number.
Mistakes to Avoid
- Claiming ITC without a valid invoice or where the supplier hasn't filed.
- Forgetting to file a return for zero-activity months.
- Incorrectly entering values in IGST/CGST/SGST columns.
Frequently Asked Questions
What is the due date for GSTR-3B for monthly filers?
The 20th of the following month. For example, March 2026 return is due by April 20, 2026.
Can I file a NIL GSTR-3B via SMS?
Yes. If you have zero transactions, you can file a NIL GSTR-3B through SMS from your registered mobile number.
What is the late fee for NIL GSTR-3B returns?
₹20 per day (₹10 CGST + ₹10 SGST), capped based on turnover slab.
Can I revise my GSTR-3B after filing?
No. GSTR-3B cannot be revised. Corrections must be made in subsequent returns through amendments in GSTR-1 and adjustments in GSTR-3B.
Related reading
For the new restriction that blocks submissions on any ITC mismatch, see the GSTR-3B zero-mismatch policy blocking filings effective April 2026.
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