GST Return Filing

By 2026, GST return filing is no longer a clerical month-end exercise. The GSTN portal now operates as a real-time reconciliation engine — e-invoice IRN data flows into GSTR-1, GSTR-1 auto-populates GSTR-3B, GSTR-2B is generated from supplier GSTR-1 filings, e-Way bill data is matched against outward supply, and the Annual Return (GSTR-9) is reconciled with the audited financials in GSTR-9C. A return that is not internally reconciled before filing is, in effect, a self-issued show-cause notice. The Rule 37A reversal mechanism, the Section 16(4) limitation, the Rule 86A blocking power, and the late fee / interest stack under Sections 47 and 50 have made disciplined monthly filing the cheapest form of tax planning available to a business.

The forms have settled into a stable architecture. GSTR-1 reports outward supplies — monthly for taxpayers above ₹5 crore turnover, quarterly under the QRMP scheme for those below. GSTR-3B is the summary monthly return where tax is actually paid and ITC actually claimed. GSTR-9 is the annual reconciliation, due by 31 December of the following FY, mandatory for taxpayers above ₹2 crore turnover. GSTR-9C is the self-certified reconciliation between books and returns, mandatory for turnover above ₹5 crore. CMP-08 serves the composition scheme. GSTR-5 / 5A / 6 / 7 / 8 cover non-resident, OIDAR, ISD, TDS and TCS deductors respectively.

We file GST returns end-to-end — from the smallest QRMP taxpayer to large multi-State enterprises with e-invoicing, ISD, and capital-goods optimisation requirements.

The Filing Calendar We Run

• Monthly filers (turnover above ₹5 crore):: GSTR-1 by 11th, GSTR-3B by 20th of the following month, IFF for QRMP optants by 13th.

• QRMP filers (turnover up to ₹5 crore):: Quarterly GSTR-1 and GSTR-3B; PMT-06 monthly tax payment; IFF for first two months of the quarter to allow recipient ITC.

• Annual returns:: GSTR-9 and GSTR-9C by 31 December of the following FY; reconciliation between books, GSTR-1 and GSTR-3B; turnover, ITC, RCM, exports, exempt supply tally.

• e-Invoicing:: Mandatory for taxpayers with turnover above ₹5 crore (lowered from ₹10 crore w.e.f. August 2023, retained at ₹5 crore through 2026); IRN generation on the IRP, auto-flow into GSTR-1.

• Composition (CMP-08):: Quarterly statement of self-assessed tax; annual GSTR-4 by 30 April of the following FY.

Where Returns Go Wrong (And What We Do About It)

ITC mismatch with GSTR-2A / 2B: Books show more credit than the portal — Section 16(2)(c) read with Rule 37A requires reversal where the supplier has not filed. We reconcile invoice-wise every month, flag non-filer suppliers, raise vendor follow-ups, and reclaim once the supplier files.

Section 16(4) deadline (30 November): ITC for an FY is barred after the 30 November of the following FY or the GSTR-9 filing date, whichever is earlier. We run a sweep in October-November each year to capture stranded ITC before it lapses permanently.

e-invoice vs GSTR-1 mismatch: IRN cancellations, late generation, or skipped invoices create the most common audit objection. Our IRN log reconciles to GSTR-1 daily.

RCM under-reporting: Goods Transport Agency, legal services, director sitting fees, import of services — RCM tax payable in cash, with corresponding ITC claim in the same month. Skipping the cash payment but claiming the ITC is the most common mistake.

Late fee and interest stack: Section 47 late fee at ₹50 per day (₹20 for nil) capped per return; Section 50 interest at 18% on net cash liability — and 24% on excess ITC availment. Filing late triggers Rule 86A blocking exposure as well.