GSTR-3B Filing in India: Step-by-Step Guide, Deadlines & Best Practices (2026)

Introduction

GSTR-3B is a monthly summary GST return that every registered taxpayer must file to report:
✔ Outward supplies (sales)
✔ Tax liability
✔ Input Tax Credit (ITC) claimed
✔ Net tax payable

GSTR-3B filing is a core GST compliance requirement and directly determines tax payment for the period. This guide by The Tax Company explains the filing process, due dates, common mistakes, and best practices to stay compliant.

What is GSTR-3B?

GSTR-3B is a self-declaration summary return introduced under GST to simplify reporting. It consolidates:

• Total taxable outward supplies
• Adjustments and refunds
• ITC available and reversed
• Tax, cess, interest, and late fee payments

Once submitted, GSTR-3B cannot be fully revised for the same period, making accuracy extremely important.

Who Must File GSTR-3B?

✔ Regular taxpayers
✔ Composition taxpayers (if applicable)
✔ Casual taxable persons
✔ Non-resident taxable persons
✔ SEZ units (where applicable)
✔ ISD and e-commerce operators

It is primarily a monthly compliance requirement for most businesses.

GSTR-3B Filing Frequency and Due Dates

Regular and CAAR Taxpayers
Filing Period: Monthly
Due Date: 20th of the next month

Composition Scheme Taxpayers
Filing Period: Quarterly
Due Date: 22nd or 24th of the next month

QRMP Scheme (Quarterly Return Monthly Payment)
Payment Due Date: 25th of the month

Due dates are subject to changes notified by the GST Council.

Step-by-Step GSTR-3B Filing Process

Step 1: Login to GST Portal

Visit www.gst.gov.in and log in using your username and password.

Step 2: Open Returns Dashboard

Navigate to Services → Returns → Returns Dashboard.

Step 3: Select Financial Year and Tax Period

Choose the relevant return period and click Prepare Online.

Step 4: Enter Outward Supplies (Table 3.1)

Enter:
✔ Total sales value
✔ Inter-state and intra-state supplies
✔ Exempt, nil-rated, and non-GST supplies

Step 5: Enter ITC Details (Table 4)

Enter:
✔ Eligible ITC as per GSTR-2B
✔ ITC reversal and ineligible ITC, if applicable

Step 6: Calculate Tax Liability

✔ Compute IGST, CGST, and SGST/UTGST
✔ Apply ITC utilization as per rules
✔ Verify tax payment summary

Step 7: Pay Tax and Interest

✔ Generate challan
✔ Make payment before filing return

Step 8: Submit and File Return

Click Submit and file using:
• EVC (OTP-based verification)
• DSC (Digital Signature Certificate)

Key Sections of GSTR-3B Explained

Outward Supplies Section
Captures total taxable sales, exports, and zero-rated supplies.

Eligible ITC Section
Includes ITC available from GSTR-2B and purchase records.

Tax Paid Section
Shows tax breakup including IGST, CGST, SGST, and cess.

Interest and Late Fee Section
Interest applies for delayed tax payment and late fees apply for delayed filing.

How to Calculate Net Tax Payable

Formula:
Total Tax Liability minus Eligible ITC minus TDS/TCS Credit equals Net Tax Payable

ITC utilization order:

1. IGST

2. CGST

3. SGST

Common Mistakes to Avoid

❌ Entering incorrect turnover values
❌ Not reconciling ITC with GSTR-2B
❌ Forgetting to pay interest on delayed filing
❌ Invoice mismatches
❌ Wrong tax rate selection
❌ Missing export or zero-rated supply details

Impact of GSTR-3B on Compliance

Accurate GSTR-3B filing:
✔ Ensures correct tax payment
✔ Enables portal reconciliation
✔ Reduces risk of notices and penalties
✔ Supports GST audit compliance
✔ Ensures smooth ITC claims

Amendments and Corrections

GSTR-3B cannot be revised once filed for the same period.
Any correction must be adjusted in the next return period.

Penalties for Late Filing

Late Fees
₹100 per day under CGST and ₹100 per day under SGST
Subject to minimum and maximum limits as notified

Interest on Tax Liability
1 percent per month or part thereof from due date till payment

Best Practices for Smooth GSTR-3B Filing

✔ Reconcile sales and purchase data before filing
✔ Verify ITC with GSTR-2B
✔ Maintain a compliance calendar
✔ Use GST-enabled accounting software
✔ Seek professional review for complex transactions

How The Tax Company Helps You

At The Tax Company, we provide:

✔ GSTR-3B preparation and filing
✔ ITC reconciliation support
✔ Pre-filing error checks
✔ Amendment strategy planning
✔ Compliance calendar and reminders
✔ Interest and penalty advisory
✔ GST audit and litigation support

We ensure timely, accurate, and stress-free GST compliance.

Frequently Asked Questions

Can I file GSTR-3B after GSTR-1?
Yes, GSTR-3B should be filed after GSTR-1 for the same period.

Can GSTR-3B be revised?
No, revisions are not allowed for the same period. Corrections must be made in future returns.

What if ITC details are not ready?
Provisional ITC may be entered, but proper reconciliation should be done before filing.

What happens if the due date is missed?
Late fees and interest become applicable.

Conclusion

GSTR-3B filing is the backbone of GST compliance. Accurate reporting, timely payment, and proper reconciliation protect businesses from penalties and improve financial discipline.

For professional GSTR-3B filing support and complete GST compliance services, contact The Tax Company today.

Call to Action

Need help filing your GSTR-3B accurately and on time?
Contact The Tax Company for expert assistance and end-to-end GST compliance support.