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GST Calculators

GST Interest Calculator

Interest on delayed GST payment at the prescribed annual rate.

Enter your details

₹
Interest is charged on the portion of tax paid in cash, i.e. after set-off of available input tax credit.
Estimate only. Results depend on the inputs and the rules and rates described below. Verify with the official source or a professional before filing or investing; this is not tax, legal or investment advice.

How it is calculated

Interest = Tax × Rate ÷ 100 × Days of delay ÷ 365. Rate = 18% p.a. for late payment (s.50(1)); 24% p.a. where ITC was wrongly availed and utilised or output tax was under-reported (s.50(3)). Days = payment date − due date.

Worked example

₹1,00,000 paid 16 days late at 18%: 1,00,000 × 18% × 16 ÷ 365 = ₹789 (rounded). The GST portal rounds interest to the nearest rupee.

About the GST Interest Calculator

Interest on delayed GST payment at the prescribed annual rate. This free gst tool runs entirely in your browser: nothing you type is sent to a server, and you can save, print or download the result.

What you need to enter

You will be asked for tax paid late (net cash liability) ₹, due date of payment, actual date of payment, reason for interest. Fields marked * are required. Every field shows a hint and the allowed range.

How to use it

  1. Fill in the inputs (sample values are pre-filled so you can see how it works).
  2. Press Calculate to see the result, breakdown and chart.
  3. Use Print, Download PDF or Share to keep the result, or come back to it from your saved history.

Who it helps

Salaried individuals, business owners, investors and professionals who want a quick, transparent estimate before they file, invest or plan. If your case has special facts, our team can review it - ask for a consultation.

Results are estimates based on the rules and rates described under "How it is calculated". Laws change and individual facts differ, so confirm with official sources or a qualified professional before acting. This is not tax, legal or investment advice.

Frequently asked questions

Is interest charged on the whole tax or only the cash portion?

Section 50(1) as amended charges interest on the tax that was payable in cash, i.e. the net liability after utilising available electronic credit ledger balance. Enter that cash portion here.

Is interest the same as the late fee?

No. Interest compensates for delayed payment of tax; the late fee under section 47 penalises delayed filing of the return. Both can apply together.

Can I avoid interest if I file but cannot pay?

Filing GSTR-3B without paying the cash liability still attracts interest on the unpaid amount until it is paid.

Need help beyond the calculator?

Talk to our tax and compliance team for advice based on your documents.

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