GSTR-1 Late Filing: Late Fee, QRMP, IFF & ITC Impact Explained

GSTR-1 late filing is not merely a portal housekeeping issue. It can trigger late fee under the CGST framework, delay the reporting of outward supplies, disrupt customer invoice visibility and create reconciliation pressure between sales registers, GSTR-1 and GSTR-3B. For businesses with regular B2B customers, the commercial impact can be as important as the statutory cost.

Direct answer: what happens if GSTR-1 is filed late?

A registered person who fails to furnish outward-supply details under section 37 by the due date is exposed to late fee under section 47 of the CGST Act. Notification No. 20/2021-Central Tax rationalised the Central Tax component of that late fee for GSTR-1 from the June 2021 tax period / quarter ending June 2021 onward, with different maximum caps based on whether the statement is nil and on the taxpayer’s preceding-year aggregate turnover.

For the Central Tax component, the notified maximum is ₹250 where there are no outward supplies; ₹1,000 for non-nil GSTR-1 where preceding-year aggregate turnover is up to ₹1.5 crore; and ₹2,500 for non-nil GSTR-1 where turnover exceeds ₹1.5 crore but does not exceed ₹5 crore. Corresponding State/UT GST consequences should be checked separately for the relevant registration.

GSTR-1 late fee: the statutory base and notified caps

Section 47(1) of the CGST Act provides the base late-fee rule for delayed furnishing of outward-supply details under section 37: ₹100 per day under the Central Goods and Services Tax law, subject to a maximum of ₹5,000. Section 128 allows the Government to waive or reduce late fee for specified classes and circumstances. Notification No. 20/2021-Central Tax uses that power to rationalise the GSTR-1 late-fee ceiling for specified taxpayers.

• Nil GSTR-1: Central Tax late-fee maximum ₹250.

• Non-nil GSTR-1; preceding FY aggregate turnover up to ₹1.5 crore: Central Tax late-fee maximum ₹1,000.

• Non-nil GSTR-1; preceding FY aggregate turnover above ₹1.5 crore and up to ₹5 crore: Central Tax late-fee maximum ₹2,500.

• For larger taxpayers and exceptional periods, the general statutory framework and any period-specific notification should be checked before quantifying exposure.

Late fee is not the same as interest

A common error is to treat GSTR-1 late fee and GST interest as the same consequence. GSTR-1 is the outward-supply statement; late fee attaches to delayed furnishing. Interest is principally linked to delayed payment of tax and is therefore analysed separately through the tax-payment/GSTR-3B framework. A business may therefore have a GSTR-1 late-fee exposure even where the tax-payment position requires a different interest computation.

For the separate payment-side analysis, see our guide on GSTR-3B late filing, late fee and interest.

Why delayed GSTR-1 can create an ITC problem for customers

For B2B businesses, delayed outward-supply reporting can become a customer-service and working-capital issue. GST system documents confirm that invoice data furnished through the QRMP Invoice Furnishing Facility flows to the recipient’s GSTR-2A and, upon filing, to GSTR-2B. The practical principle is important: if supplier-side reporting is delayed, recipient-side visibility can also be delayed, affecting reconciliation and potentially the timing of input-tax-credit decisions.

This is why finance teams should not judge GSTR-1 delay only by the rupee amount of late fee. A small statutory fee can still create larger commercial friction if key customers cannot reconcile invoices in the expected tax period.

QRMP taxpayers: GSTR-1 and IFF are not the same thing

Eligible taxpayers with aggregate annual turnover up to ₹5 crore may use the Quarterly Return Monthly Payment (QRMP) scheme, under which GSTR-1 and GSTR-3B are filed quarterly while tax is paid monthly. For the first two months of a quarter, the Invoice Furnishing Facility (IFF) is an optional mechanism for reporting specified B2B invoices and related debit/credit notes.

The GST Portal states that IFF for the first two months of a quarter is available up to the 13th of the succeeding month. Importantly, IFF is optional and there is no late fee for “late filing” of IFF because an unfiled IFF expires after the permitted window. Saved records can be moved to the next eligible IFF period or to the quarterly GSTR-1, subject to the portal workflow.

Practical example

Assume an eligible QRMP taxpayer makes a material B2B supply in the first month of a quarter but does not use IFF within the permitted window. The invoice is not automatically lost, but the supplier may have to report it in a later eligible period or in the quarterly GSTR-1. The customer may therefore not see the invoice in the same month’s credit statement. The supplier should communicate the timing difference proactively rather than waiting for the customer’s reconciliation team to raise an exception.

What should a business do when GSTR-1 is already late?

• Reconcile the sales register with e-invoices, credit/debit notes, advances and amendments before filing; do not rush a defective statement merely to stop the delay.

• Identify B2B invoices likely to affect customer ITC visibility and communicate with key customers where the reporting period has shifted.

• Quantify the applicable late fee using the taxpayer’s filing frequency, nil/non-nil status, turnover band and any notification applicable to the period.

• Reconcile GSTR-1 with GSTR-3B after filing so that outward-tax disclosures and tax-payment records do not diverge without explanation.

• Preserve filing acknowledgements, working papers and reconciliation schedules for audit and future notice-response purposes.

When repeated late filing becomes a bigger compliance problem

A single delayed GSTR-1 should be corrected quickly. Repeated or prolonged return non-compliance, however, can become part of a wider GST default profile involving return-defaulter notices, best-judgment assessment, registration consequences and customer disputes. Businesses should therefore treat recurring late filing as a process-control failure rather than as a routine cost.

If non-filing has escalated beyond a simple delay, read our detailed guide to GSTR-3A, section 46 notices and section 62 best-judgment assessment.

Where the GST registration has already been cancelled for non-filing, see our practical guide on revocation timelines and the 90/270-day portal framework.

A better monthly control for finance teams

The strongest preventive control is a three-way monthly reconciliation: sales register versus e-invoice/e-way-bill data versus GSTR-1 draft, followed by a GSTR-1-to-GSTR-3B reconciliation before the tax return is finalised. Large B2B invoices, amendments and credit notes should be separately flagged because they are the items most likely to generate recipient follow-up when reporting is delayed or incorrect.

Frequently asked questions

Does late GSTR-1 automatically mean 18% interest?

No. GSTR-1 late fee and interest on delayed tax payment arise from different provisions. Interest should be computed from the actual tax-payment facts and the applicable section/rule rather than simply because GSTR-1 was filed late.

Is there a late fee for missing IFF under QRMP?

The GST Portal states that IFF is optional and no late fee applies because IFF is not available as an ordinary late filing after the permitted window. Unfiled IFF data may need to be moved or reported in the later eligible period or quarterly GSTR-1.

Can a late GSTR-1 affect customers?

Yes, especially in B2B cases. Delayed supplier reporting can delay invoice visibility in recipient-side GST statements and create ITC reconciliation issues, even when the supplier later regularises the filing.

Professional assistance

PGT & Associates assists businesses with GST return reconciliations, delayed-return regularisation, GSTR-1/GSTR-3B mismatch reviews, non-filing notices and registration-related compliance. For recurring delays, the priority should be to fix the underlying data and control process, not merely file each pending return in isolation.

Disclaimer

This article is for general professional information and is based on the law and official guidance reviewed as of 20 August 2026. GST notifications and portal procedures may be amended or extended for specific classes or tax periods. Facts should be reviewed before taking a filing, tax, credit or litigation position.