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• How do you keep country-specific tax and take-home pay calculations current when tax rules change during the year?

  Asked by SaaS Browser · November 2, 2026

  Answered by FireWise HQ from FireWise · November 2, 2026

  We copy each country's rates and thresholds straight from the official sources, such as the finance ministry's payroll rules or the tax code itself. We update them when each new budget is published.

  If a rule changes partway through the year, the calculator applies both rates for the right number of pay periods. In Ireland, for example, PRSI rises on 1 October 2026, so a 2026 salary pays 39 weeks at the old rate and 13 at the new one. Before any update goes live, it has to match worked examples taken from the official figures. If a number isn't confirmed yet, we leave it out and say so.

  Every result shows which tax year it uses. You can see the 2026 rules applied across nine European countries here: https://firewisehq.com/data/take-home-pay-europe-2026

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