GSTR-3B: 20th monthly or 22/24 quarterly depending on state grouping

Saturday 23 May 2026 carries no Goods and Services Tax filing deadline of its own, but it sits two calendar days ahead of one of the most overlooked obligations on the indirect-tax map. Taxpayers in the Quarterly Return Monthly Payment (QRMP) scheme must deposit the tax for April 2026 — the first month of the April-June 2026 quarter — through Form GST PMT-06 by Monday 25 May 2026. Skip it and interest at 18% per annum begins accruing from 26 May 2026 under Section 50 of the Central Goods and Services Tax Act, 2017.

GSTR-3B is the summary self-assessment return through which every registered person declares output tax, claims input tax credit and pays the net liability for a tax period. The GST Network does not compute the figure for you; the arithmetic, and any error in it, both belong to the filer. The complication that trips up the largest number of businesses is deceptively small — two filers in two different states can face two different due dates for the very same quarter.

This watchlist sets out the GSTR-3B due-date structure for the late-May 2026 window: the 20th-of-the-month rule for monthly filers, the 22nd-versus-24th split for QRMP taxpayers by state grouping, the PMT-06 challan that QRMP creates between quarters, and the Reserve Bank of India policy event on 3-5 June 2026 that frames borrowing costs for every GST-registered business.

Statutory Deadlines

The GSTR-3B due date is not one date. It turns on whether a taxpayer files monthly or under QRMP, and — for QRMP filers — on which of two state categories the principal place of business falls into.

Monthly filers cover any registered person with aggregate turnover above Rs 5 crore in the preceding financial year, plus anyone who has not opted into QRMP. They file GSTR-3B every month, due on the 20th of the month that follows the tax period. The return for April 2026 was therefore due on 20 May 2026, and the return for May 2026 falls due on 20 June 2026.

QRMP filers are registered persons with aggregate turnover up to Rs 5 crore who have opted to file one GSTR-3B per quarter instead of three. For them the quarterly return is due on the 22nd or the 24th of the month following the quarter end, depending on state grouping. The table below maps the full late-May to July 2026 cycle.

The 22nd-versus-24th divide follows a fixed two-category list. Category I — due the 22nd — groups the southern and western states; Category II — due the 24th — groups the northern, eastern and north-eastern states together with the remaining union territories. The split is set out below.

A business with its principal place of business in Chennai files its Apr-Jun 2026 GSTR-3B by 22 July 2026; an identical business in Kolkata files the same quarter's return by 24 July 2026. The two-day gap is a function of registration state, not turnover or sector — and it is the single most common reason a QRMP filer enters the wrong date in a compliance diary.

QRMP does not switch off monthly tax payment. For the first two months of every quarter, a QRMP taxpayer must deposit tax through Form GST PMT-06 by the 25th of the following month — the obligation that makes 25 May 2026 the live deadline this week for April 2026 tax. The quarter's GSTR-3B, filed in July 2026, then reconciles the PMT-06 deposits against the final self-assessed liability. Treating QRMP as a quarterly-only scheme is a costly misreading: two of every three months still carry a hard payment date.

Late filing and late payment carry separate charges. The table sets out the headline rates under the CGST Act, 2017.

Consider the cost of a missed Category II deadline. A Delhi business that files its Apr-Jun 2026 GSTR-3B on 30 July 2026 instead of 24 July 2026 is six days late: at Rs 50 per day that is Rs 300 in late fee before any interest, while 18% per annum interest on the unpaid tax runs alongside it. The fee looks modest on a single return, but it compounds across a year of repeated slips and signals a filing pattern that invites departmental scrutiny.

There is no nil-rated relief once the due date is crossed: a taxpayer with no transactions in the period still owes Rs 20 per day from the day after the deadline until the NIL GSTR-3B is filed. The full text of Sections 47 and 50 is published on India Code, and the live returns dashboard sits on the GST portal.

One income-tax date shares this window. The first instalment of advance tax for FY 2026-27 — 15% of the estimated annual liability — is due on 15 June 2026, as set out on the Income Tax Department portal. Businesses already gathering GST figures for their June 2026 filings can size the advance-tax cheque in the same sitting.

Market Events

The single dated market event on the near horizon is the Reserve Bank of India's Monetary Policy Committee meeting, scheduled for 3-5 June 2026. The repo rate stands at 5.25% after the MPC held it unchanged on 8 April 2026 — the second consecutive pause, following a cumulative 125 basis points of cuts through 2025. The stance is neutral, and the committee's April 2026 projections placed CPI inflation for FY27 at 4.6% and GDP growth at 6.9%.

For GST-registered businesses the MPC outcome matters because external benchmark lending rate (EBLR) linked working-capital loans reset within roughly three months of any repo change. A held rate at 5.25% keeps the cost of the cash-credit lines that bridge the gap between paying GST and collecting it broadly stable into the June 2026 quarter. Filers should track the 3-5 June 2026 decision on the RBI monetary policy page. Tighter or looser working capital costs feed directly into how comfortably a business funds its 25 May 2026 PMT-06 challan and its 20 June 2026 GSTR-3B.

There is a planning angle for the cash a disciplined filer protects. Every rupee of Rs 50-per-day late fee and 18% interest avoided is a rupee that can be redeployed. A business owner who routes even Rs 10,000 a month of penalty savings into a systematic investment can model the outcome on Oquilia's SIP calculator, test a rising contribution on the step-up SIP calculator, or price a one-time surplus on the lumpsum calculator.

Earnings

No individual company results are confirmed in Oquilia's editorial calendar for 23 May 2026, and this newsroom does not publish unverified earnings schedules. Readers tracking quarterly results should rely on the filings companies lodge directly with the stock exchanges rather than on forecast calendars.

The late-May 2026 window does carry a GST-linked reconciliation point that earnings-focused readers should note. The GSTR-1 outward-supplies statement for May 2026 is due on 11 June 2026; the figures a company reports there must align with the GSTR-3B summary it files for the same period. Mismatches between the two are a routine trigger for departmental notices and can delay a buyer's input tax credit — the subject covered in Oquilia's guide to the GSTR-1 monthly due date and the QRMP IFF option.

For investors the discipline cuts the same way it does for filers: predictable compliance frees predictable cash. A surplus identified after a clean June 2026 quarter can be deployed through the calculators linked above rather than absorbed by a Rs 50-per-day late fee that earns nothing.

FAQ

What is the GSTR-3B due date for monthly filers?

Monthly filers — registered persons with aggregate turnover above Rs 5 crore in the preceding year, or anyone not in QRMP — file GSTR-3B by the 20th of the month following the tax period. The May 2026 return is due 20 June 2026.

Why do QRMP filers in different states have different due dates?

QRMP quarterly GSTR-3B is split into two state categories. Category I states (southern and western) file by the 22nd of the month after the quarter; Category II states (northern, eastern, north-eastern and the remaining union territories) file by the 24th. For the April-June 2026 quarter that means 22 July 2026 or 24 July 2026.

Is 23 May 2026 a GST filing deadline?

No. 23 May 2026 is a Saturday with no GSTR-3B or PMT-06 deadline. The nearest obligation is the QRMP PMT-06 challan for April 2026 tax, due 25 May 2026.

What is Form GST PMT-06 and when is it due?

PMT-06 is the challan through which QRMP taxpayers deposit tax for the first two months of a quarter. It is due by the 25th of the following month — 25 May 2026 for April 2026 tax and 25 June 2026 for May 2026 tax. The quarterly GSTR-3B later reconciles these deposits.

What is the late fee and interest for a late GSTR-3B?

Late filing of a GSTR-3B with tax payable attracts Rs 50 per day under Section 47 of the CGST Act, 2017. Delayed payment of the tax itself attracts interest at 18% per annum under Section 50, running from the day after the due date until the tax is paid.

Do NIL filers escape the late fee after the due date?

No. A NIL GSTR-3B filed after its due date attracts a late fee of Rs 20 per day. There is no nil-rated relief once the deadline is crossed — the charge runs until the return is filed.

How is GSTR-3B different from GSTR-1?

GSTR-1 is the detailed statement of outward supplies, due on the 11th of the next month for monthly filers. GSTR-3B is the summary self-assessment return on which the net tax is actually paid. A business files both, and the two must reconcile for the same tax period.