Advance Tax & 234B/234C Interest Calculator

How this calculator works

Enter your total estimated tax liability for the year and any TDS/TCS already deducted — the difference is your "assessed tax" for advance tax purposes. Then enter how much you actually paid, cumulatively, by each of the four advance tax due dates. The calculator checks each instalment against its required percentage and tolerance band, and separately checks your total payment against the 90% threshold under Section 234B.

The advance tax schedule

• 15 June — 15% of assessed tax (interest triggers only if paid amount is below 12%)
• 15 September — 45% cumulative (interest triggers only if paid amount is below 36%)
• 15 December — 75% cumulative (no tolerance band)
• 15 March — 100% cumulative (no tolerance band)

Interest under Section 234C is 1% per month, charged for 3 months on a shortfall in the June, September, or December instalments, and for 1 month on a shortfall in the March instalment.

Section 234B: default in advance tax payment

Separately from the instalment-by-instalment check, if your total advance tax paid by year-end is less than 90% of your assessed tax, Section 234B charges simple interest at 1% per month on the entire shortfall, counted from 1 April until the tax is actually paid (any part of a month counts as a full month).

Who doesn't need to pay advance tax

Advance tax isn't required at all if your assessed tax (after TDS/TCS) is under Rs. 10,000 (Section 208), or if you're a resident senior citizen (60 or older) with no business or professional income (Section 207) — in either case, no 234B or 234C interest applies.

Assumptions and limitations

This calculator models the standard advance tax instalment schedule that applies to individuals, HUFs, and most other taxpayers. It doesn't cover the different (single-instalment) schedule for taxpayers opting for the presumptive taxation scheme under Section 44AD/44ADA, and it doesn't model Section 234A (interest for late filing of the return itself). Treat this as a planning estimate — for a return you're actually filing, verify the figures with a CA or the official tax portal.

Privacy by design

All calculations happen entirely in your browser. Your income and tax figures are never uploaded or stored anywhere.