GST Filing Due Date August 2026 — GSTR-1 & GSTR-3B
Everything you need to file on time for July 2026 tax period
Updated July 2026 · 4 min read
If you're a GST-registered business, here are the exact deadlines you need to hit this month for the July 2026 tax period — plus how to organize your invoices fast so you're not scrambling on the last day.
📅 Key Deadlines — August 2026
11 Aug
GSTR-1 (Monthly)
20 Aug
GSTR-3B (Monthly)
13 Oct
GSTR-1 (QRMP Q2)
⚠️ Important: GSTR-1 must be filed before GSTR-3B. Since a recent rule change, GSTR-3B Table 3.1 auto-populates from your GSTR-1 data — and the portal blocks certain edits if GSTR-1 isn't filed first. File in order!
💰 Late Fee If You Miss the Deadline
Return Type
Late Fee
Maximum Cap
GSTR-1 (with supplies)
₹50/day (₹25 CGST + ₹25 SGST)
₹10,000
GSTR-1 (Nil return)
₹20/day
₹500
🚀 How to file faster — organize invoices in 3 steps
1
Collect all July invoices (PDF, photos, whatever format you have them in)
2
Extract GSTIN, taxable value, CGST/SGST/IGST, and HSN codes — automatically instead of manually retyping each invoice
3
Upload the organized Excel/CSV data directly into the GST portal or hand it to your CA — no last-minute scrambling
Manually typing 50-100 invoices before a deadline is exactly the kind of bottleneck that causes late filings. AI-based extraction tools can do in seconds what takes hours by hand.