The GST return process is being rewritten — here's what changed and what to do now
A working brief for business owners and finance teams on what has actually changed in GST return filing across India this year — and what to fix before the portal fixes it for you.
Eight changes reshaping how you file
Each item below reflects a live rule, portal enforcement, or scheduled change — not a proposal. Dates matter here more than usual, since several carry hard cut-offs.
The GST portal now permanently blocks any return more than three years past its due date. Monthly periods from October 2022 and FY 2020-21 annual returns were the first casualties. An "Unbarring" application exists, but it needs jurisdictional-officer approval and moves slowly — treat it as a last resort, not a plan.
Permanent lock riskThe two-tier structure — largely 5% and 18%, with 40% reserved for luxury and sin goods — continues as the baseline for every return filed in 2026. HSN/SAC codes must be checked against the current list before charging or reporting.
Rate structureTobacco-related products were split between the 18% and 40% slabs, with the compensation cess removed and excise/valuation mechanisms revamped. Businesses in this category need to re-check every affected line item before filing.
Sector watchA system glitch failed to account for the minimum cash balance under CGST Rule 88B(1), producing incorrect auto-calculated interest in March 2026 filings. The portal added a "RE-COMPUTE INTEREST" button — anyone who filed in that window should verify their figures, not assume the auto-fill was right.
Requires manual checkFrom the February 2026 period onward, GSTR-3B auto-fills a "Tax Liability Breakup" tab for liabilities carried over from an earlier period. It has to be opened and explicitly saved — skipping it stalls the filing.
Process stepAny gap between GSTR-2B (what your supplier reported) and GSTR-3B (what you claimed) now blocks filing outright. ITC can only be claimed against invoices your supplier has actually filed — supplier compliance is no longer someone else's problem.
Filing blockere-Invoicing becomes mandatory for GSTINs with AATO above ₹5 crore in FY 2025-26. For those above ₹10 crore, invoices must reach the IRP within 30 days — anything later is invalid for ITC purposes, with no exceptions on record.
ITC eligibilityOriginally set for June 2026, this was pushed back after industry pushback over ERP and API readiness. Once live, Ship-to GSTIN becomes mandatory wherever Ship-to details exist, and a new voluntary e-Way Bill closure feature goes live alongside it.
UpcomingWhat this means for your filing desk this quarter
Anything within striking distance of the 3-year bar takes priority over routine monthly work — there is no recovering a return once it's locked.
Reconcile against GSTR-2B before filing, not after. Under Zero Mismatch, a discrepancy caught post-filing means a blocked return, not a correction.
Your ITC is only as reliable as your weakest supplier's filing habits. A simple compliance scorecard catches this before it reaches your return.
If Table 5.1 interest was auto-calculated for the February 2026 period, re-run it with the recompute tool before assuming it's correct.
Turnover crossing ₹5 crore or ₹10 crore this financial year changes your obligations from 1 April — check your AATO now, not at year-end.
Registration, refund, and audit process changes are on the agenda. Nothing to file yet — but worth tracking before you lock in next quarter's process.
ACSOL runs GST health checks that map your backlog, ITC exposure, and e-invoicing readiness against every rule above.
Request a GST Health Check →