Methodology

Our calculator is intentionally estimate-based. We optimise for clarity and speed, not payroll-grade precision. Here's how it works.

1. Normalisation to annual

Whatever pay period you choose (annual, monthly, weekly, daily, hourly), we convert your input into an annual gross salary using configurable hours and days per week.

2. Progressive tax bands

We apply that country's published progressive tax bands and any tax-free allowance. For some countries we also subtract a primary rebate or standard deduction.

3. Basic employee deductions

Where data is available, we add the most common employee social contributions (e.g. National Insurance in the UK, Social Security and Medicare in the USA, Medicare Levy in Australia, UIF in South Africa).

4. Conversion back

We convert your estimated net annual figure back to monthly, weekly, daily and hourly equivalents using the same hours/days settings.

What this calculator does not do

• It does not handle regional or state-level income tax variations.
• It does not include pension contributions, salary sacrifice, student loans, health insurance levies or filing-status differences.
• It does not provide financial, tax or legal advice. Always consult a qualified professional or the official tax authority before making decisions.

Sources

Each country page lists the specific sources used (e.g. HMRC, IRS, ATO, SARS). Sources are reviewed manually each tax year.

Estimate mode

Some supported countries are flagged as "estimate mode" — that means the rules are simplified or partially modelled. The country page will tell you when this is the case.