(INDIA) — Taxpayers filing quarterly GST returns are checking the GST portal’s revised interest calculation for February 2026 as the due dates for QRMP filers draw near, keeping a compliance issue alive after the monthly filing deadline has passed.

The portal introduced an enhancement from the January 2026 tax period onward that changes how interest in Table 5.1 of `GSTR-3B` is computed. The update links the calculation to the minimum cash balance available in the Electronic Cash Ledger under the proviso to Rule 88B(1) of the CGST Rules, 2017.

That timing still matters on 20 April 2026. Businesses under the Quarterly Return Monthly Payment, or QRMP, scheme are still within the filing window for the January-March 2026 quarter, with `GSTR-3B` due on 22 April 2026 or 24 April 2026, depending on the notified State or Union Territory category, unless extended by notification.

Monthly filers ordinarily had to file the February 2026 return by 20 March 2026. QRMP filers follow a different calendar, and February sits inside the current quarter they are preparing to close.

The portal advisory says the system’s interest calculation in Table 5.1 now gives the benefit of the minimum cash balance available in the Electronic Cash Ledger from the due date of return filing up to the date of tax payment. That change affects the base on which GSTR-3B interest is calculated.

The revised formula reads: Interest = (Net Tax Liability – Minimum Cash Balance in ECL from due date to date of debit) × (No. of days delayed / 365) × Applicable Interest Rate. In practice, cash already lying in the ledger during the relevant period can reduce the amount on which interest applies.

That point carries weight in cases where the displayed interest does not reflect the relief tied to cash already available in the ledger. A mismatch can leave taxpayers paying more than the statutory method requires, or disputing figures generated by the system at the point of filing.

Businesses that rely heavily on portal-generated numbers are watching that field closely as the filing window narrows. The issue reaches consultants, freelancers, exporters, NRIs with Indian GST registrations, and small digital or cross-border service providers whose records often depend on what appears in the portal at filing stage.

The GST portal guidance lays out a direct verification path. Taxpayers can log in, open the Return Dashboard, select the relevant period, open `GSTR-3B`, choose Prepare Online, and review the system-generated PDF.

Table 5.1 is the line under review. It captures interest and late fee payable and paid, and it is the place where taxpayers can test whether the figure shown aligns with the Rule 88B(1)-based method now built into the portal.

That check has become more pointed because the portal also offers a “Re-Compute Interest” feature. The function is intended to trigger a fresh system calculation using the updated parameters, letting the taxpayer compare the refreshed amount on screen or in a regenerated PDF.

The feature serves as a verification and correction step during the current cycle, especially for QRMP filers working through the January-March 2026 quarter. A portal-level issue affecting GSTR-3B interest for February 2026 therefore remains current, not historical, in the QRMP context.

The advisory also draws a hard line around how much discretion taxpayers have once the system fills in the amount. Interest auto-populated in Table 5.1 is non-editable downward, and the portal treats that figure as the minimum payable.

That means recomputation does not open the door to freely lowering the amount by manual entry. Taxpayers must still self-assess the correct liability, and they may amend the figure upward if needed.

The distinction matters because visual explainers shared among tax professionals often focus on recalculation without the portal’s limit on downward edits. Under the advisory, the point of recomputation is to ensure the minimum system-generated interest is correct, not to create an unrestricted option to reduce it.

As 22 April 2026 and 24 April 2026 approach, the filing calendar keeps the issue squarely in front of QRMP filers. February belongs to the quarter now being filed, so any error in the portal’s treatment of Electronic Cash Ledger balances can affect returns that have not yet been submitted.

That also changes how the compliance alert should be read. The issue is already closed for many monthly filers under the standard due date, but it remains timely for quarterly filers still finalizing the same period inside the January-March 2026 return.

Taxpayers still within the window can review the interest component before submission, compare the displayed figure with the Rule 88B(1) logic, use the recomputation function where it appears relevant, and keep PDFs or screenshots as part of their records. Those records matter later if the number in Table 5.1 comes under review during reconciliation.

Responsibility for the final tax position still sits with the taxpayer even in an auto-populated return environment. The portal can calculate a minimum amount, but it does not replace self-assessment.

The immediate question in many cases is narrow: whether the portal has correctly reflected the minimum cash balance in the Electronic Cash Ledger during the period from the due date to the date of debit. That single variable can change the GSTR-3B interest figure in Table 5.1.

QRMP filers closing the quarter now are therefore examining the return with more care than a routine portal check might suggest. With February 2026 still inside an active filing cycle for them, the numbers on the screen remain live compliance data, not a closed-month artifact.

The safest course before filing is to verify Table 5.1 against the revised Rule 88B(1) method and use “Re-Compute Interest” where needed, because once the return goes in, the amount shown as the minimum payable has already shaped the filing record.