The 2026 GST Filing Calendar

GST deadlines are boringly regular, which is exactly what makes them dangerous: the 11th and the 20th arrive every single month, and one busy fortnight is all it takes to donate a late fee to the government. The standing dates:

ReturnWho files itDue date
GSTR-1 (monthly)Regular taxpayers above the QRMP limit11th of the following month
GSTR-3B (monthly)Same monthly filers20th of the following month
GSTR-1 (QRMP, quarterly)QRMP-scheme taxpayers13th of the month after the quarter
GSTR-3B (QRMP, quarterly)QRMP taxpayers22nd or 24th after the quarter, by state (see below)
PMT-06 (QRMP monthly tax)QRMP taxpayers, months 1-2 of each quarter25th of the following month
GSTR-9 (annual return)Regular taxpayers31 December of the next financial year

The QRMP state split: the 22nd applies to Category I states (Gujarat, Maharashtra, Karnataka, Kerala, Tamil Nadu, Telangana, Andhra Pradesh, Madhya Pradesh, Chhattisgarh, Goa, and the southern union territories); the 24th applies to Category II (Delhi, Uttar Pradesh, Rajasthan, Punjab, Haryana, Bihar, West Bengal, the Northeast, and the remaining northern states). Full state-by-state calendars are maintained on ClearTax's GST calendar.

Dates can shift. The GST Council occasionally extends deadlines by notification. Treat this page as the standing schedule, confirm current-month dates on the GST portal or with your CA, and remember that a reminder two days early absorbs most surprises.

One Text per Deadline: the Reminder Recipes

Every date above becomes a permanent WhatsApp reminder with one sentence. Set them once; they fire every month or quarter forever:

Remind me on the 9th of every month to prepare GSTR-1 for filing Remind me on the 18th of every month to reconcile and file GSTR-3B Remind me on the 23rd of every month to pay GST via PMT-06 Remind me every year on December 20 to start GSTR-9 preparation

Notice the deliberate buffer: the nag lands 2 days before each deadline, because the reminder's job is to start the work, not to announce the emergency. If reconciliation typically takes you longer, move the buffer earlier, "on the 15th of every month" for a 20th deadline.

One-tap versions of these (no typing) are on the GST due date reminder page. Your first 5 reminders are free, no signup.

Your first 5 reminders are free

No app, no account. Save the number, send a message, done.

Which Reminders You Need, by Filer Type

  • Monthly filer (most businesses above the threshold): two recurring reminders, GSTR-1 (9th) and GSTR-3B (18th), plus the annual GSTR-9 nudge. Three texts, done for life.
  • QRMP freelancer or small business: quarterly GSTR-1 (11th of Jan/Apr/Jul/Oct) and GSTR-3B (20th or 22nd of those months depending on your state), plus monthly PMT-06 (23rd). "Remind me on the 11th of January, April, July and October to file quarterly GSTR-1" sets all four quarters in one message.
  • Freelancers juggling GST with client work: pair the filing reminders with invoice follow-up reminders, the GST you owe is downstream of the invoices you remembered to chase.

For CAs: One Reminder per Client Deadline

If you file for 50 clients, the dates above multiply into a compliance calendar no memory should hold. The pattern that works is client-named reminders with staggered prep buffers:

Remind me on the 7th of every month to collect GSTR-1 data from Mehta & Sons Remind me on the 16th of every month to file GSTR-3B for Sharma Traders

The full workflow, document chasing, filing waves, post-filing confirmations, is covered in the CA's guide to WhatsApp reminders.

The Obvious but Necessary Note

This is a deadline calendar, not tax advice. Whether you belong in QRMP, what your state category is, and how an extension notification affects you are questions for your CA or the GST portal. What this page fixes is the part no professional can do for you: actually remembering, every month, on time.

Frequently Asked Questions

What are the GST return due dates in 2026?

For monthly filers: GSTR-1 by the 11th and GSTR-3B by the 20th of the following month. QRMP taxpayers file quarterly: GSTR-1 by the 13th and GSTR-3B by the 22nd (Category I states) or 24th (Category II) after the quarter, with monthly PMT-06 tax payment by the 25th. The annual GSTR-9 is due 31 December of the next financial year. Dates can be extended by notification.

How do I set a GST reminder on WhatsApp?

Text NagMeLater 'Remind me on the 18th of every month to file GSTR-3B' and the recurring reminder is set permanently. Set it 2 days before the actual deadline so the nag starts the work rather than announcing the emergency. One-tap versions are on the GST due date reminder page.

Is the GSTR-3B due date the 20th, 22nd or 24th?

All three, depending on who you are: monthly filers file by the 20th; QRMP quarterly filers file by the 22nd in Category I states (Gujarat, Maharashtra, Karnataka, Tamil Nadu and other southern/western states) or the 24th in Category II (Delhi, UP, Rajasthan, Bihar, the Northeast and other northern/eastern states).

What happens if I miss a GST filing deadline?

Late fees accrue per day per return plus interest on unpaid tax, and repeated delays can block e-way bills and invite scrutiny. The exact amounts depend on your return and turnover, ask your CA. The cheaper path is structural: a recurring reminder with a 2-day buffer costs less than any single late fee.

Can a CA set GST reminders for multiple clients?

Yes, one reminder per client-deadline pair works well: 'Remind me on the 16th of every month to file GSTR-3B for Sharma Traders'. Client-named reminders mean each nag tells you exactly whose filing needs attention, with no spreadsheet cross-referencing.