About

Three framework-free engines do all the work. The Salary Engine builds a component structure from your CTC and template, and derives gross and net views. The Deduction Engine runs a plugin per claimed component — over fifty are catalogued — applying statutory caps like the ₹1.5 lakh 80C umbrella or the least-of-three HRA rule. The Tax Engine then walks the configured slabs, rebate, surcharge, and cess for the selected year and regime.

All arithmetic uses integer paise, so nothing drifts. All statutory values live in versioned JSON configuration, so a Finance Act change is a config edit, not a code release. The interface performs no calculations of its own — every figure on screen came out of an engine, and the computation sheet shows the steps.

Statutory values. Tax slabs, the standard deduction, the Section 87A rebate and its marginal relief, surcharge bands, and the 4% health and education cess follow the Income-tax Act, 1961 as amended by the Finance Acts in force for each supported year (FY 2025-26 and FY 2026-27), per the provisions published by the Income Tax Department (incometax.gov.in). Deduction limits — the ₹1.5 lakh Section 80C umbrella, 80CCD(1B), the age-based 80D and 80DDB caps, and the rest of Chapter VI-A — come from the same Act. The HRA exemption follows Section 10(13A) read with Rule 2A. Provident fund rates reference the Employees' Provident Funds and Miscellaneous Provisions Act, 1952; the 4.81% gratuity accrual convention derives from the Payment of Gratuity Act, 1972; and professional tax amounts respect the ₹2,500 annual ceiling of Article 276 of the Constitution, with state-specific values per each state's levy. All of these live in versioned JSON configuration — if a Finance Act changes them, the config changes, not the code.

Spotted a value that has drifted from the statute? Tell us — corrections with a citation get fixed fastest.