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Advance Tax Interest Calculator

Estimate interest for advance tax paid short or late. The instalment dates and shares come from the verified rule and are shown in the working.

In rupees, for example 125000 or 1,25,000.50

Pick the date from the calendar or type it as year-month-day

Advance tax you paid

Add each payment you made. Leave this empty if nothing was paid.

Under the Income-tax Act, 2025, interest for advance tax instalments paid short or late is charged under section 425 (formerly section 234C of the Income-tax Act, 1961). Interest for advance tax paid short over the whole year is under section 424 (formerly section 234B).

Not worked out here: the single instalment by 15 March for presumptive income (section 425(3)), the exception in section 425(4), any rounding of the amount on which interest is charged, income that arises later in the year (such as capital gains), set-off of refunds and extensions.

How this works

  1. Choose the section and the tax year, enter the tax due on your returned income and the date you want interest worked out to.
  2. Add the payments you made. For each instalment we take what was still unpaid on its due date, using the schedule in the verified rule.
  3. Each shortfall earns interest for the fixed number of months the verified rule sets for that instalment.

Last verified: 20 October 2026 · Source: s.425(1) Table (15 Jun / 15 Sep / 15 Dec / 15 Mar; 15% / 45% / 75% / 100% of the tax due on returned income; interest 3% / 3% / 3% / 1%) and s.425(2) (12% by 15 Jun, 36% by 15 Sep): threshold from s.404 ("Rs. 10000 or more") · Open the official source

About this tool

What it does
Works out the interest for paying advance tax short or late against the instalment dates of the year.
The rule it rests on
Income-tax Act, 2025: section 404 sets who is liable to pay advance tax, and section 425 charges interest where an instalment falls short of the share of the tax due by its date. The instalment shares and the rate are approved rule rows with their own "last verified" line. Official source: Income-tax Act, 2025, section 425 (interest for deferment of advance tax)
Checked on
11 November 2026. Where a figure the tool shows is still to be verified by our expert team, the tool says so instead of showing it.
Next step
The advance-tax instalment dates, with the GST, TDS and ROC dates for every month beside them. Compliance calendar

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