What happens if GSTR-1 and GSTR-3B don't match?

Mismatches between GSTR-1 (outward supplies declared) and GSTR-3B (tax paid) trigger GST department notices and scrutiny. The department reconciles via GSTR-2A/2B and can demand the difference plus interest and penalty.

GSTR-3B cannot be directly amended. Errors in GSTR-3B for a tax period can be corrected in subsequent GSTR-3B filings by making adjustments. However, errors in outward supplies must be corrected through GSTR-1 amendments.

GSTDetailed Comparison

GSTR-1 vs GSTR-3B

GSTR-1 vs GSTR-3B — understanding the two key GST returns

Option A

GSTR-1

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Option B

GSTR-3B

Overview

GSTR-1 and GSTR-3B are the two primary GST returns that most businesses must file. GSTR-1 reports outward supplies (sales invoices); GSTR-3B is a self-assessment summary where tax liability is paid. Understanding both is essential to avoid GST notices.

Head-to-Head Comparison

Factor	GSTR-1	GSTR-3B	Winner
Purpose	Reports outward supplies (sales invoices)	Self-assessment summary — tax payment	Tie
Contains	Invoice-wise details of B2B, B2C, exports, debit/credit notes	Summary of sales, ITC, and net tax payable	Tie
Due Date (Monthly)	11th of following month	20th of following month	A wins
Tax Payment	No tax payment — information only	Net tax paid via challan	Tie
Amendment Possible?	Yes — in subsequent month's GSTR-1	Limited — no direct amendment form	A wins
Effect on Buyer's ITC	Buyer's GSTR-2B auto-populated from your GSTR-1	No direct effect on buyer	Tie

Data updated for FY 2025–26. Regulations may change — consult a professional before deciding.

Which Should You Choose?

Choose GSTR-1 if…

GSTR-1 is not a choice — it is a mandatory return for reporting your sales. File it to ensure your buyers can claim ITC on purchases from you.

Get GSTR-1

Choose GSTR-3B if…

GSTR-3B is not a choice — it is mandatory for paying your net GST liability. Both returns must be filed every tax period.

Still not sure which to choose?

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Frequently Asked Questions

Common questions about GSTR-1 vs GSTR-3B

GSTR-1 is due on the 11th and GSTR-3B is due on the 20th of the following month. So GSTR-1 is filed first. However, you can file GSTR-3B without filing GSTR-1 (though this is not recommended as it may lead to ITC mismatches).

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