GSTR-1 vs GSTR-3B: What Each Return Actually Does

New GST registrants often confuse the two main returns. They do different jobs — and both matter.

GSTR-1: your sales detail

GSTR-1 reports every outward supply — invoice by invoice for B2B sales. What you file here lands in your buyers’ GSTR-2B and becomes their input credit. File it late or wrong and your customers feel it directly.

GSTR-3B: your summary and payment

GSTR-3B is the monthly summary where you declare total sales, claim input credit and actually pay the tax. It is the return that settles your liability with the government.

Why they must match

The department compares your GSTR-1, GSTR-3B and your buyers’ claims automatically. Mismatches generate notices — the most common trigger we see in practice. A monthly reconciliation before filing prevents almost all of them.

Want both returns handled and reconciled every month? See our GST return filing service or book a free consultation.