Who builds this, and how it is checked

What this is

A calculator that turns a Nepali salary into the tax withheld from it and the cash that reaches your account, under the Income Tax Act 2058 and the Finance Act for the year you pick.

It covers 3 fiscal years — 2083/84, 2082/83, 2081/82 — and shows its working rather than just a total: which band took how much income, which relief was capped and by which rule, and what your employer's retirement contribution did to your assessable income.

Who builds it

It is built and maintained by NepalHRM, which makes payroll and HR software used by employers in Nepal. The same tax rules run inside that payroll product, which is the reason this calculator exists: the engine had to be correct for real payslips before it was ever put on a public page.

Questions, corrections and disagreements about a number are welcome at [email protected]. If you think a figure is wrong, tell us the inputs — we would rather fix it than defend it.

How the numbers are checked

Three habits do most of the work, and all three are things you can verify rather than take on faith:

1. The engine is tested, not eyeballed.The tax rules are a self-contained TypeScript module with its own test suite covering the band edges, the relief ceilings, the SSF waiver, the women's rebate and the part-year cases. A change that moves any of those numbers fails the build.
2. One engine, not two. The public API that serves these calculations carries a byte-for-byte copy of the same module, and the test suite travels with it. If the two ever drift apart, continuous integration fails — rather than a visitor being shown one number and a payroll run another.
3. The prose is computed, not typed. Every figure quoted in the guide, the blog and the answer boxes is produced by the engine when the site is built. The writing cannot fall out of step with the tool, because it is not written by hand.

Money is handled in whole paisa throughout, never as a decimal fraction — the arithmetic that quietly loses a rupee over twelve payslips is the arithmetic this deliberately does not do.

Where the rules come from

Rates, bands and ceilings are read from a single dated registry in the source, one entry per fiscal year. They were last checked against the Act on 5 August 2026. When a Finance Act changes a band, one entry changes and every page, table and worked example on the site follows it.

• Income Tax Act 2058

  Assessable income, the §63 relief ceilings, and the withholding rules.

• Finance Act 2083

  The FY 2083/84 rate schedule.

• Social Security Fund

  Contribution rates and the treatment of the 1% Social Security Tax.

What this is not

It is not tax advice, and it is not a filing. It is an estimate accurate to the rules it implements. Your employer's payroll may differ on allowances, one-off payments, mid-year changes or benefits in kind that this page knows nothing about. For anything you are going to file or sign, talk to a registered accountant.

It also does not collect anything. The calculation runs on your device and your salary is never sent to a server — see the privacy page for exactly what that means.