GSTR-1 Due Tomorrow: The 11th-of-the-Month Deadline Every Monthly GST Filer Must Hit

If you file GST returns every month, tomorrow is the date that matters. Form GSTR-1, the statement of outward supplies mandated by Section 37 of the Central Goods and Services Tax Act, 2017, falls due on the 11th of the month following the tax period for regular monthly filers. Every registered normal taxpayer who raised even a single tax invoice in the period has to report it by that cut-off, and the consequence of slipping past midnight is automatic: a system-generated GSTR-3A defaulter notice and a running late fee under Section 47. This edition of Tomorrow's Watchlist maps the deadlines, the return-cycle dominoes that follow the 11th, and the compliance events worth pencilling in before the GST portal timestamps your filing.

The stakes are not merely your own late fee. Because GSTR-1 feeds the auto-drafted GSTR-2B of every one of your buyers, a return filed late ripples outward: your customer's input tax credit under Section 16(2)(aa) of the CGST Act cannot crystallise until your invoices land on the portal. In a working-capital-tight month, filing GSTR-1 on the 11th is as much a courtesy to your buyers' cash flow as it is a statutory duty of your own.

Statutory Deadlines

The governing calendar is set by the Goods and Services Tax Network schedule and Section 37 of the CGST Act. For a taxpayer on the monthly cycle, outward supplies for the previous month must be furnished in GSTR-1 by the 11th. Those enrolled in the Quarterly Return Monthly Payment (QRMP) scheme, available to registered persons with aggregate annual turnover up to Rs 5 crore, file GSTR-1 by the 13th of the month following the quarter-end, and may optionally furnish invoices for the first two months of a quarter through the Invoice Furnishing Facility (IFF) by the 13th of the succeeding month.

Four categories are carved out of the GSTR-1 obligation entirely. The exclusion list, drawn from the GSTN user guide, is worth committing to memory because filing when you are not required to, or failing to file when you are, both create avoidable friction.

The taxpayers who do not file GSTR-1 at all are: Input Service Distributors, composition-scheme taxpayers, tax deductors under Section 51, and e-commerce operators collecting tax at source under Section 52. Every other registered normal taxpayer is in scope, and the requirement holds even for a nil period, when a nil GSTR-1 must still be filed by the 11th to keep the record clean. If you are unsure whether your advance-tax and GST cash outflows are colliding this fortnight, the advance tax calculator helps you sequence the two, and the GST calculator confirms the tax value that will appear against each invoice line.

One structural rule bears repeating before the deadline: GSTR-1 cannot be revised. Once submitted for a tax period, an error can only be corrected through the amendment tables of a later GSTR-1, never by reopening the filed statement. That single constraint is why reconciling your sales register against your e-invoices on the 10th, rather than the 11th, is the difference between a clean filing and a three-month correction trail.

Market Events

The 11th is not an isolated date; it is the first tile in a monthly compliance chain that governs how credit and cash move through the GST system. Treating the return cycle as a sequence of market events, here is what the days on either side of tomorrow look like for a monthly filer.

The linkage between these three dates is the heart of the GST design. Your GSTR-1 on the 11th populates your buyers' GSTR-2B, auto-drafted on the 14th, and that statement is the ceiling on the input tax credit they can claim in their own GSTR-3B on the 20th. Miss the 11th, and you have not just delayed your own paperwork, you have narrowed a customer's claimable credit for the month. For businesses running thin margins, that is a live commercial event, not a back-office footnote.

There is a second, quieter market event embedded in the deadline: the interest meter. GSTR-1 itself carries no interest because it is a statement rather than a payment. But the tax it declares becomes payable through GSTR-3B on the 20th, and any delay there accrues interest under Section 50 of the CGST Act at 18% per annum on the net tax paid in cash. Filing GSTR-1 accurately on the 11th is therefore the upstream act that keeps the downstream 18% clock from ever starting.

Earnings

Unlike an equity watchlist built around quarterly results, tomorrow's GST-driven calendar is a statutory-compliance event rather than a corporate-earnings event, and honesty requires stating that plainly: no company results are confirmed on the official record for this watchlist window, so none are reported here. Listed companies file their financial results under Regulation 33 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, and those filings appear on the BSE and NSE corporate-announcement pages rather than in the GST calendar. Readers tracking a specific scrip's results date should verify it against the relevant exchange's filing portal, not infer it from the return cycle.

What the GSTR-1 deadline does shape, indirectly, is the reported margin of every GST-registered business. Because a supplier's late GSTR-1 can defer a buyer's input tax credit under Section 16(2)(aa), the timing of the 11th feeds into working-capital cost and, ultimately, the quarterly numbers a company eventually files. In that sense the 11th is an earnings input even though it is not an earnings date. If you are modelling how deferred credit or delayed refunds change the compounding on your own retained cash, the SIP calculator and lumpsum calculator let you test what an extra month of blocked capital costs over a full year.

The cost of missing the 11th

The penalty architecture for a late GSTR-1 sits in Section 47 of the CGST Act. The Act itself prescribes a late fee of Rs 100 per day under the central levy and an equal amount under the state levy, subject to a statutory cap and to reductions notified by the Government. Under the currently notified reductions applied by the GST portal, the effective late fee for a return with outward supplies is Rs 50 per day, being Rs 25 under CGST and Rs 25 under SGST, while a nil GSTR-1 attracts Rs 20 per day, being Rs 10 under each. The fee runs from the day after the 11th until the return is filed, subject to the turnover-based ceilings notified under the Act.

Layered on top of the fee is the GSTR-3A defaulter notice. As the GSTN user guide sets out, non-filing by the due date triggers a system-generated 3A notice to the registered person, formally recording the default. Persistent non-filing has sharper consequences than the daily fee alone: it can block the generation of subsequent GSTR-1 returns, since the portal enforces sequential filing, and it damages the compliance rating that counter-parties increasingly check before extending credit. The arithmetic is unforgiving because it compounds by the day, so the practical rule is simple: file on the 11th, or file the moment you realise you have slipped, rather than waiting.

A pre-deadline checklist

Before the portal timestamps tomorrow's filing, five reconciliations separate a clean GSTR-1 from a correction cycle. First, match your sales register against your e-invoice records so that every B2B invoice with its Invoice Reference Number is captured. Second, confirm that credit and debit notes for the period are entered, because omitting them distorts both your liability and your buyer's credit. Third, verify the place-of-supply field on inter-state invoices, the single most common source of amendment-table corrections. Fourth, reconcile HSN-summary values against the invoice-level totals. Fifth, file, since an unsubmitted draft on the 11th is a late return on the 12th.

For the broader compliance context, it helps to keep the vocabulary straight. The distinction between advance tax and self-assessment liability, the mechanics of tax deducted at source, and the timelines around your annual income tax return all sit alongside the GST calendar in a business owner's month, and confusing one deadline for another is how avoidable late fees are born. GSTR-1 is the outward-supply anchor of that calendar, and the 11th is its fixed point.

FAQ

What is the GSTR-1 due date for monthly filers?

For taxpayers filing monthly, Form GSTR-1 is due on the 11th of the month following the tax period. Supplies made in a given month must be reported by the 11th of the next month, as set out in the GSTN return schedule under Section 37 of the CGST Act, 2017.

When is GSTR-1 due for QRMP quarterly filers?

Registered persons under the Quarterly Return Monthly Payment (QRMP) scheme file GSTR-1 by the 13th of the month following the end of the quarter. They may optionally push invoices for the first two months of the quarter through the Invoice Furnishing Facility by the 13th of the succeeding month.

Who is not required to file GSTR-1?

Input Service Distributors, composition taxpayers, tax deductors under Section 51 and e-commerce operators collecting tax at source under Section 52 are excluded from filing GSTR-1. Every other registered normal taxpayer must file it, even for a nil period.

What happens if I miss the GSTR-1 deadline?

The system generates a GSTR-3A defaulter notice and a statutory late fee accrues under Section 47 of the CGST Act. Late filing of GSTR-1 also delays the recipient's GSTR-2B, which can hold up their input tax credit under Section 16(2)(aa).

Can GSTR-1 be revised once filed?

No. GSTR-1 cannot be revised after submission for a tax period. Any error must be corrected through the amendment tables of a subsequent GSTR-1 return, not by reopening the filed statement.

Does interest apply on late GSTR-1?

GSTR-1 is a statement of outward supplies, so no interest attaches to it directly. Interest under Section 50 of the CGST Act, currently 18% per annum, applies to the delayed payment of tax made through GSTR-3B, which is a separate return due on the 20th for monthly filers.