Taxpayer & regular income

Taxpayer

Regime

Age

TDS / TCS credit expected (₹)

Compute interest as on

Presumptive u/s 44AD / 44ADA — single instalment, 15 March

Resident senior citizen with no business income — exempt from advance tax u/s 207

Income — head-wise ITA 2025 references as on the e-filing portal

Annual figures; regular income is treated as accruing evenly through the year. Enter capital gains, dividends and winnings in the period grid below instead.

Gross salary (incl. allowances)

Exempt allowances — HRA etc. (old regime)

Professional tax paid 19(1) Sl.1 ↔ 16(iii)

House property

Presumptive business income u/s 58 ↔ 44AD/44ADA

Other business / profession income (net)

Interest — savings bank

Interest — deposits (bank / post office / co-op)

Other interest income

Any other income (other sources)

Deductions Chapter VI-A ↔ ITA 2025 · caps auto-applied · old regime unless noted

80C basket ↔ 123 (LIC, PF, PPF, NSC, housing principal…)

80CCD(1B) ↔ 124(3) — NPS self

80CCD(2) ↔ 124(1) — NPS employer (both regimes)

80D ↔ 126 — mediclaim

80G ↔ 133 — donations (eligible amount)

80E ↔ 129 — education-loan interest

Other Chapter VI-A

80TTA / 80TTB ↔ 153 on savings/deposit interest is computed automatically from the interest fields above.

Special incomes — by period of accrual drives 234C→425 timing

Enter each gain/receipt in the window it arose (or is expected). Regular income above is treated as accruing evenly; these are not.

Advance tax / self-assessment tax paid

Add each challan with its date — payments land in the correct instalment automatically. Payments after 31 March count as self-assessment tax and reduce 234B→424 prospectively.

Common questions

How is 234C interest calculated on capital gains?

Capital gains enter the instalment schedule only from the window in which they arise — a gain booked in January creates no June/September/December shortfall. Interest runs at 1% per month for three months per deferred instalment (one month for March). This calculator captures gains period-wise and applies the rule automatically.

What are the advance tax due dates for F.Y. 2026-27?

15 June (15%), 15 September (45%), 15 December (75%) and 15 March (100%), cumulatively. Presumptive taxpayers under 44AD/44ADA pay the entire amount by 15 March. Resident senior citizens without business income are exempt.

What is the safe harbour in 234C?

No interest applies on the first instalment if you paid at least 12% of the tax due, and on the second if at least 36% — even if below the 15%/45% marks. The calculator flags when a small top-up would have engaged the safe harbour.