GSTR-1 vs GSTR-3B: Key Differences Every Business Must Know (2025)
If you've recently registered for GST, you've probably stared at your compliance calendar and wondered: what exactly is the difference between GSTR-1 and GSTR-3B, and why do I have to file both? You're not alone. This is one of the most searched GST questions in India — and the confusion is understandable, because both returns deal with your sales, both are filed regularly, and both carry penalties if missed.
- GSTR-1 reports what you sold, invoice by invoice; GSTR-3B reports what you owe, in consolidated totals only.
- GSTR-1 is due the 11th of the next month (monthly) or 13th after the quarter (QRMP); GSTR-3B is due the 20th (monthly) or 22nd/24th (QRMP).
- Neither return can be revised once filed — corrections flow through GSTR-1A or the next period's tables.
- Since January 2022, the two returns are mutually blocking: you cannot file GSTR-3B until GSTR-1 is filed for the same period.
- From July 2025, GSTR-3B's Table 3 is auto-populated from GSTR-1 and locked, making GSTR-1 accuracy more important than ever.
Here's the clearest way to think about it before we dive into specifics:
GSTR-3B = What you owe (totals only, plus your tax payment)
GSTR-1 vs GSTR-3B: Side-by-Side Comparison
| Feature | GSTR-1 | GSTR-3B |
|---|---|---|
| Purpose | Report outward supplies — invoice-wise | Summary return — declare liability, claim ITC, pay tax |
| Detail level | Every invoice individually | Consolidated totals only |
| Due date (monthly filers) | 11th of following month | 20th of following month |
| Due date (QRMP quarterly) | 13th after quarter end | 22nd or 24th after quarter end |
| Can be revised? | No (amend in next period via tables 9–11) | No |
| Who sees it? | Your buyers — feeds their GSTR-2B | Tax department — your payment record |
| Feeds into | Buyers' ITC claims via GSTR-2B | Government tax ledger |
| Filing order | Always file first | File after GSTR-1 |
| Impact if missed | Buyers can't claim ITC; GSTR-3B gets blocked | Tax payment delayed; interest applies |
What Is GSTR-1 Actually For?
GSTR-1 is your outward supply ledger submitted to the GST portal. For every invoice you raise during the period, you report: the buyer's GSTIN (for B2B sales), invoice number, date, value, and place of supply, taxable value and GST amount broken down by rate, and HSN/SAC codes for goods and services.
This information doesn't stay with the tax department alone. It flows directly to your buyers. When your buyer opens their GSTR-2B (auto-drafted ITC statement), every eligible invoice you've filed appears there automatically. This is how ITC works across the supply chain — your GSTR-1 is literally your buyers' ITC.
Get an invoice wrong in GSTR-1 — wrong GSTIN, wrong tax amount, wrong HSN — and your buyer gets blocked from claiming that credit until you correct it.
What Is GSTR-3B Actually For?
GSTR-3B is your tax payment return. It's where you: declare total outward supply liability (now auto-populated from GSTR-1 from July 2025), declare total eligible ITC from GSTR-2B, offset ITC against liability, and pay the net amount in cash.
There's no invoice listing in GSTR-3B — just totals. And critically, it's the return where money actually moves from your cash/credit ledger to the government's account.
How GSTR-1 and GSTR-3B Are Connected — The Chain That Matters
Most guides treat these two returns as separate things. They're not. They form a linked chain — and from FY 2025–26, that link is enforced by the portal itself.
Here's the full chain:
↓
Buyers' GSTR-2B auto-updated (their ITC)
↓
You open GSTR-3B → Table 3 auto-fills from your GSTR-1 (from July 2025)
↓
You verify, claim ITC from GSTR-2B, pay net tax
↓
Filing complete
The critical implication: Because Table 3 of GSTR-3B is now locked to GSTR-1 data, any error in GSTR-1 automatically flows into GSTR-3B. You cannot manually override it. The correction path is to file a GSTR-1A amendment before submitting GSTR-3B.
What Happens If You File GSTR-3B Without Filing GSTR-1?
Since January 2022, the GST portal enforces a mutual dependency: GSTR-1 is blocked if your GSTR-3B for the previous period is pending, and GSTR-3B is blocked if your GSTR-1 for the same period is not filed.
This means you can't game the system by filing one and skipping the other. Both must be filed every period, in the right order: GSTR-1 first, GSTR-3B second.
Which Should You File First — And Why?
Always GSTR-1 first. Here's why:
- GSTR-3B Table 3 is locked to GSTR-1 data (from July 2025) — you can't compute accurate tax liability in GSTR-3B without GSTR-1 being filed
- Your buyers need your GSTR-1 to claim ITC — they may be waiting on you before they can file their own GSTR-3B
- GSTR-3B is blocked if GSTR-1 is pending (portal enforcement)
The correct sequence every single month or quarter:
Compile and verify all invoices
File GSTR-1 by the 11th (monthly) or 13th (quarterly)
Download GSTR-2B and reconcile ITC
Open GSTR-3B → verify auto-populated Table 3
Claim eligible ITC, pay net liability
File GSTR-3B by the 20th (monthly) or 22nd/24th (quarterly)
Due Dates at a Glance
| Return | Monthly Filers | Quarterly (QRMP) |
|---|---|---|
| GSTR-1 | 11th of next month | 13th after quarter |
| GSTR-3B | 20th of next month | 22nd or 24th after quarter |
| Gap between them | 9 days | 9–11 days |
The 9-day gap between GSTR-1 and GSTR-3B due dates is intentional — it gives you time to review the auto-populated GSTR-3B data and make any GSTR-1A corrections if needed.
GST Portal — return filing schedule
What Is the Late Fee for Each Return?
| Scenario | GSTR-1 Late Fee | GSTR-3B Late Fee |
|---|---|---|
| Returns with tax liability | ₹50/day | ₹50/day |
| Nil returns | ₹20/day | ₹20/day |
| Maximum (turnover ≤ ₹1.5 Cr) | ₹2,000 | ₹2,000 |
| Maximum (> ₹5 Cr) | ₹10,000 | ₹10,000 |
Additionally for GSTR-3B: 18% p.a. interest on any unpaid tax from the due date.
Quick Summary
The difference between GSTR-1 and GSTR-3B is simple once you know the purpose of each:
- GSTR-1 = Tell the government (and your buyers) exactly what you sold. Invoice by invoice. Due the 11th.
- GSTR-3B = Pay the government the net GST you owe. Totals only. Due the 20th.
Both are mandatory. Both are non-revisable. Both carry identical late fee structures. And from July 2025, they're formally linked — GSTR-1 directly populates GSTR-3B's key table. Get GSTR-1 right, and GSTR-3B becomes largely a confirmation exercise.
Use our GST Calculator to verify your GST amounts before entering them into either return.
GSTR-1 vs GSTR-3B — Frequently Asked Questions
Which should I file first, GSTR-1 or GSTR-3B?
Always GSTR-1 first. The portal enforces this — GSTR-3B is blocked until GSTR-1 for the same period is filed, and from July 2025 GSTR-3B's Table 3 is auto-populated from GSTR-1.
Can I file GSTR-3B without filing GSTR-1?
No. Since January 2022, the GST portal blocks GSTR-3B filing if GSTR-1 for the same period is pending.
Do GSTR-1 and GSTR-3B have the same due date?
No. GSTR-1 is due the 11th (monthly) or 13th after the quarter (QRMP), while GSTR-3B is due the 20th (monthly) or 22nd/24th (QRMP) — a 9 to 11 day gap.
What happens if I don't file GSTR-1 on time?
Your buyers cannot claim Input Tax Credit on your invoices until you file, and your own GSTR-3B filing for that period gets blocked.
Can GSTR-1 or GSTR-3B be revised after filing?
No, neither can be revised. GSTR-1 errors are corrected via amendment tables in a later GSTR-1 or a GSTR-1A; GSTR-3B has no revision mechanism at all.
Related: How to File GSTR-1 · How to File GSTR-3B · Input Tax Credit Under GST