Advance Tax Scheduler
The single-instalment rule under Section 211(1)(b) that most calculators get wrong for 44ADA taxpayers — plus live 234B/234C interest tracking.
This is a calculator, not tax advice. It estimates outcomes based on publicly available rules and typical provider pricing — it does not account for your specific circumstances. Rules and rates change. Verify anything you rely on with a qualified CA before you act on it. Interest calculations here are planning estimates based on the figures you enter — your actual assessed tax can only be confirmed after filing.
Not sure? Use the 44ADA calculator to estimate this first.
Single instalment: 100% of advance tax due by 15 March. Most generic calculators get this wrong for you.
Your schedule — advance tax payable: ₹1,50,000
100% cumulative · installment ≈ ₹1,50,000
If you pay nothing more this year: ₹1,500 in interest accrues.
234C (instalment shortfalls): ₹1,500
How this is calculated
Advance tax is normally due in four cumulative instalments — 15% by 15 June, 45% by 15 September, 75% by 15 December, and 100% by 15 March. Section 211(1)(b) carves out an exception: if you're computing your income under the presumptive schemes in Section 44AD or 44ADA, the entire year's advance tax is due in a single instalment by 15 March. This tool switches schedules based on the toggle you set.
Section 234C charges 1% per month interest on any shortfall at each instalment date — 3 months' worth for a shortfall at the June, September, or December instalments, and 1 month's worth for a shortfall at the March instalment (or the single 44ADA instalment). This is evaluated strictly as of each due date: paying the shortfall a day late doesn't undo the interest already accrued for missing that specific date.
Section 234B is separate: if your total advance tax paid by the end of the financial year is under 90% of your assessed tax, interest accrues at 1% per month from 1 April of the following assessment year until you pay the balance — calculated here on the full unpaid amount, with a partial month counting as a full month.
Frequently asked questions
Why does this show a different schedule than other advance tax calculators?
Most generic advance-tax calculators assume the standard four-instalment schedule (15% by 15 June, 45% by 15 September, 75% by 15 December, 100% by 15 March). But Section 211(1)(b) says taxpayers computing income under Section 44ADA (or 44AD) pay their entire advance tax in a single instalment by 15 March. If you're on 44ADA and use a generic calculator, it will overstate your 234C interest exposure in the earlier months — this tool gets that right.
What if I switch between 44ADA and books of accounts during the year?
The instalment schedule that applies is determined by how you'll actually compute your income for that year's return. If you're planning to use 44ADA for the year, use the single-instalment schedule even if you haven't filed yet — the 44ADA/44AD provision looks at how income is computed for the year, not a mid-year election.
What's the difference between 234B and 234C interest?
234C charges 1% per month on a shortfall at each instalment due date during the year — it's locked in at that date even if you pay the shortfall shortly after. 234B is different: it only starts from 1 April of the following year (the assessment year), and only applies if your total advance tax paid by the end of the financial year was under 90% of your assessed tax. They can both apply in the same year.
Does the calendar file (.ics) get emailed to me or stored anywhere?
No — it's generated entirely in your browser from the numbers you entered and downloaded directly to your device. Nothing is transmitted or stored on any server.
More tools for export-services consultants
Foreign Payment Net-Realization Calculator
See what actually lands in your Indian account after fees, spread, and GST — compare providers side by side.
44ADA vs. Books-of-Accounts Comparator
Presumptive taxation vs. regular books for consultants — with the break-even expense ratio.
Export-of-Services GST Checker
Do you need GST registration for overseas clients? LUT or pay-and-refund?
Export Invoice Generator
Compliant export invoices with SAC codes, LUT declaration, and RBI purpose codes — nothing leaves your browser.