Advance Tax & Interest Calculator

Advance tax is due when your tax for the year, after TDS and TCS, is ₹10,000 or more. Pay 15% by 15 June, 45% by 15 September, 75% by 15 December and 100% by 15 March; presumptive cases pay once, by 15 March. Shortfalls attract 1% a month under sections 234B and 234C (sections 424 and 425 of the 2025 Act).

1. Tax after TDS and TCS is the year's total tax minus the TDS and TCS already deducted; if it is under ₹10,000, or you are a resident senior citizen with no business or professional income, no advance tax is due (sections 207–211, or sections 403–408 of the 2025 Act).
2. The total paid should reach 15% of that tax by 15 June, 45% by 15 September, 75% by 15 December and 100% by 15 March; presumptive cases under section 44AD or 44ADA (section 58 of the 2025 Act) pay 100% by 15 March.
3. Section 234C (section 425) charges 1% a month on each instalment's shortfall for 3 months (1 month for the March instalment), but nothing for the June or September instalment if at least 12% or 36% of the tax was paid by then.
4. If total advance tax paid is under 90% of the tax after TDS and TCS, section 234B (section 424) charges 1% a month on the unpaid amount from 1 April until the month the return is filed.
5. Each interest base is rounded down to the nearest ₹100, and part of a month counts as a full month (Rule 119A, or Rule 269 under the 2025 Act).

Neha, a freelance designer, has total tax of ₹2,00,000 for FY 2025-26 under the normal scheme, and her clients deducted ₹50,000 as TDS. She paid advance tax of ₹20,000 by 15 June 2025, ₹40,000 by 15 September, ₹30,000 by 15 December and ₹30,000 by 15 March 2026, and filed her return on 31 July 2026.

1. Tax after TDS: ₹1,50,000.
2. 15 Jun 2025: ₹20,000 paid against ₹22,500 due; at least 12% was paid, so no interest.
3. 15 Sep 2025: ₹60,000 paid in total against ₹67,500 due; at least 36% was paid, so no interest.
4. 15 Dec 2025: ₹90,000 paid against ₹1,12,500 due; 1% × 3 months on the ₹22,500 shortfall = ₹675.
5. 15 Mar 2026: ₹1,20,000 paid against ₹1,50,000 due; 1% × 1 month on the ₹30,000 shortfall = ₹300.
6. Section 234B: ₹1,20,000 is under 90% of ₹1,50,000, so 1% × 4 months (April to July 2026) on ₹30,000 = ₹1,200.

Neha owes ₹2,175 in interest: ₹975 under section 234C and ₹1,200 under section 234B.

Advance tax is due in four instalments: 15% of the year's tax after TDS and TCS by 15 June, 45% by 15 September, 75% by 15 December and 100% by 15 March. Under presumptive taxation (section 44AD or 44ADA, or section 58 of the Income-tax Act 2025), the whole amount is due in one instalment by 15 March.

You have to pay advance tax if your tax for the year, after TDS and TCS, is ₹10,000 or more (section 208, or section 404 of the Income-tax Act 2025). A resident senior citizen with no business or professional income does not have to pay it.

Section 234C charges 1% per month on the shortfall against each instalment: for 3 months on the June, September and December instalments and for 1 month on the March one. No interest arises for June if at least 12% of the tax was paid by 15 June, or for September if at least 36% was paid by 15 September. Section 425 of the Income-tax Act 2025 carries the same rule.

If advance tax paid is less than 90% of the tax after TDS and TCS, section 234B charges 1% per month on the unpaid amount, from 1 April after the financial year until the return is filed. Part of a month counts as a full month, and section 424 of the Income-tax Act 2025 carries the same rule.

A resident senior citizen with no business or professional income does not have to pay advance tax. A senior citizen with business income, including presumptive income under section 44AD or 44ADA, pays it like anyone else once the tax after TDS and TCS is ₹10,000 or more.

Yes. The amount on which interest under sections 234B and 234C is charged is rounded down to the nearest ₹100, under Rule 119A (Rule 269 under the Income-tax Act 2025).