About the Advance Tax Calculator
This calculator shows how much advance tax you must pay by each due date in tax year 2026-27 (1 April 2026 to 31 March 2027) and how much interest you will be charged if your payments fall short. Enter your estimated tax for the year after TDS and TCS, the advance tax you paid (or plan to pay) in each instalment window, and the month in which you will pay any balance, and it calculates the instalments, the interest for deferment of instalments and the interest for default in payment.
From 1 April 2026 these rules sit in the Income-tax Act, 2025: section 404 requires advance tax when the year’s tax after TDS is ₹10,000 or more, section 408 sets the instalments (15% by 15 June, 45% by 15 September, 75% by 15 December, 100% by 15 March), section 425 replaces old section 234C (3% on each quarterly shortfall and 1% on the March shortfall) and section 424 replaces old section 234B (1% a month from 1 April after the tax year if you paid less than 90% of the assessed tax). Presumptive taxpayers declaring business or professional income under the old 44AD/44ADA schemes may pay everything by 15 March.
Freelancers, consultants, traders, landlords, investors with capital gains and salaried people with large other income use it to avoid surprises when filing. Resident individuals aged 60 or more with no business or professional income do not have to pay advance tax. Shortfalls caused by capital gains, dividends or first-year business income that you could not foresee are exempt from the instalment interest if paid in later instalments; that relief is not modelled here.
With the default inputs, the total interest payable is ₹3,800.00. Change any value above to recalculate instantly.
How to use the advance tax calculator
- 1Estimate your total tax for 2026-27, including surcharge and cess, and subtract TDS and TCS.
- 2Choose regular, presumptive or senior-citizen status.
- 3Enter the advance tax paid in each instalment window.
- 4Pick the month you expect to pay any remaining tax.
- 5Read the required instalments and the interest under sections 425 and 424 (old 234C and 234B).
Formula and method
Advance tax is the year’s estimated tax minus TDS and TCS. By each due date you must have paid at least 15%, 45%, 75% and 100% of it. For each of the first three dates, interest of 1% a month for three months (3%) is charged on the shortfall; for 15 March it is 1% for one month. No interest is charged for June if you paid at least 12% by 15 June, or for September if you paid at least 36% by 15 September. Presumptive taxpayers owe only the 1% on any shortfall at 15 March.
If total advance tax paid by 31 March is less than 90% of the assessed tax, simple interest of 1% for every month or part of a month is charged on the unpaid amount from 1 April after the tax year until you pay it (normally with your return). Shortfalls are rounded down to the nearest ₹100 before applying the rate, as in established practice. The calculator assumes the balance is paid in one go in the month you choose and that your estimate equals the tax on your returned income.
- Tax
- Tax on total income for 2026-27 after TDS, TCS and reliefs
- Shortfall
- Required cumulative instalment minus cumulative advance tax paid by that date
- months
- Months (or part months) from 1 April 2027 to the date the balance is paid
Worked examples
Consultant who underpaid every instalment
On ₹2,00,000 of tax the cumulative targets are ₹30,000, ₹90,000, ₹1,50,000 and ₹2,00,000. Shortfalls of ₹10,000, ₹20,000 and ₹30,000 cost 3% each (₹300 + ₹600 + ₹900) and the ₹40,000 March shortfall costs 1% (₹400). Because only 80% was paid, 1% a month for April–July on ₹40,000 adds ₹1,600.
June relief at 12%
Paying ₹12,000 (12%) by 15 June and a cumulative ₹45,000 by 15 September means no June interest despite missing 15%, and the later targets of ₹75,000 and ₹1,00,000 are met exactly, so nothing is payable.
Freelancer under presumptive taxation paying late
A presumptive taxpayer only has to pay by 15 March. The ₹30,000 shortfall then costs 1% (₹300), and because ₹50,000 is less than 90% of ₹80,000, 1% a month for four months on ₹30,000 adds ₹1,200.
Frequently asked questions
What are the advance tax due dates for 2026-27?+
At least 15% of the year’s advance tax by 15 June 2026, 45% by 15 September, 75% by 15 December and 100% by 15 March 2027. Presumptive business and professional taxpayers can pay the whole amount by 15 March. Anything paid by 31 March still counts as advance tax for the year.
Who has to pay advance tax?+
Anyone whose tax for the year, after TDS and TCS, is ₹10,000 or more — including salaried people with significant interest, rent or capital gains. Resident senior citizens aged 60 or above who have no business or professional income are exempt.
How is interest under section 234C calculated?+
Interest is 1% a month for three months (3%) on the shortfall against 15%, 45% and 75% of the tax at the June, September and December dates, and 1% on the shortfall at 15 March. Paying at least 12% by June and 36% by September avoids interest for those two dates. Under the Income-tax Act, 2025 this is section 425.
How is interest under section 234B calculated?+
If advance tax paid is less than 90% of the assessed tax, you pay simple interest of 1% for every month or part of a month from 1 April after the tax year until the tax is paid, on the unpaid amount. Under the Income-tax Act, 2025 this is section 424.
Do 234B and 234C still apply after the new Income-tax Act?+
The Income-tax Act, 2025 took effect on 1 April 2026 and renumbered the provisions: section 424 now covers interest for default in advance tax (old 234B) and section 425 covers interest for deferment of instalments (old 234C). The rates, due dates and the ₹10,000 threshold are unchanged.
How do I pay advance tax?+
Pay online through the e-Pay Tax service on the income tax e-filing portal or your bank’s net banking, choosing the advance tax payment type for the right tax year. Keep the challan identification number (CIN) to report in your return.
Tax results are estimates based on published rules and simplified assumptions. They are not tax advice — check official guidance or a tax professional for your situation.