Free tool · GST and TDS

Late Fee and Interest Calculator

What a late GSTR-3B, GSTR-1 or TDS return costs, worked out from the rule tables.

Rule pack version 2 · as of 13 Oct 2026

Return

Monthly GST summary return and tax payment

Filing type

MonthlyQuarterly (QRMP)

State

Quarterly due dates depend on it.

Month

Filed on (or will file on)

Nil return (nothing to report for the period)

Aggregate turnover of the previous FY

Decides the band of the fee cap.

Tax paid in cash after the due date (optional)

For the interest estimate.

The due date comes from the rule tables for the period you pick, including any notified extension.

Pick the return and period, enter the filing date, then work out the fee. The result shows the rule behind every figure.

For CA firms

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Method

Where the Figures Come From

The due date comes from the same rule engine as the OneTrails compliance calendar, including any extension notified for the period. Days late are counted from the due date (or from the end of a late-fee waiver, when one is notified) to the filing date you enter.

The fee then follows the late-fee rule for the return: a daily amount, a cap that depends on the band of last year’s turnover, a lower rate for nil returns, or for TDS and TCS statements a cap at the tax in the statement. Interest on GST paid late is worked out by days, on the cash you enter, and rounded to the rupee as the portal does.

Every figure names the rule row it came from, the date that row took effect and how sure the rule table is. Interest on TDS deducted or paid late depends on deduction dates and is worked out inside OneTrails, not here.

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