GST compliance is a monthly discipline, and missing a due date — even by a day — means interest and penalties start accumulating. Here’s a complete, clear calendar of all GST return filing due dates for April 2026, so you can plan ahead rather than scramble.
April 2026 GST Due Date Calendar
| Due Date | Return | Who Files | Period |
| 11 April 2026 | GSTR-1 | Regular monthly taxpayers (turnover >₹5 Cr) | March 2026 |
| 13 April 2026 | GSTR-1 (IFF) | QRMP scheme taxpayers (optional B2B upload) | March 2026 |
| 20 April 2026 | GSTR-3B | Regular monthly filers (turnover >₹5 Cr) | March 2026 |
| 22 April 2026 | GSTR-3B | QRMP category 1 states (turnover up to ₹5 Cr) | Q4 FY 2025-26 |
| 24 April 2026 | GSTR-3B | QRMP category 2 states (turnover up to ₹5 Cr) | Q4 FY 2025-26 |
| 30 April 2026 | GSTR-4 | Composition scheme taxpayers | FY 2025-26 (Annual) |
| 30 April 2026 | GSTR-7 | TDS deductors under GST | March 2026 |
| 30 April 2026 | GSTR-8 | TCS collectors (e-commerce operators) | March 2026 |
Late Filing Penalties
| Return | Late Fee per Day | Maximum Late Fee |
| GSTR-1 | ₹50 (₹25 CGST + ₹25 SGST) | ₹10,000 (₹5,000 each) |
| GSTR-3B | ₹50 (₹25+₹25) + 18% interest on tax | ₹10,000 (₹5,000 each) |
| GSTR-3B (Nil return) | ₹20 (₹10 CGST + ₹10 SGST) | ₹500 |
| GSTR-4 | ₹50 per day | ₹2,000 |
GSTR-1: What to Include for March 2026
Your GSTR-1 for March 2026 (filed by 11th April) must include all outward supply invoices for March — both B2B and B2C. Given that March is the financial year closing month, it’s crucial that all invoices are correctly entered, especially any last-minute year-end sales or credit notes.
GSTR-3B: Key Points for March 2026 Filing
March’s GSTR-3B is the most scrutinised filing of the year because it closes out FY 2025-26. Ensure you reconcile GSTR-1 with GSTR-3B, claim any ITC inadvertently missed during the year, and correctly reverse any ITC on credit notes received.
| Save the Dates, File On Time GST compliance is not just about avoiding penalties — consistent on-time filing builds your credibility as a taxpayer and avoids unnecessary scrutiny. Set calendar reminders today for each of the April 2026 due dates listed here. With March year-end closing taking up your attention, it’s easy to let April deadlines slip. |
