A useful tax comparison needs more than a recent date at the top of a page. It needs the right rule for your arrival year, a source that supports that rule, and a calculation that changes when the rule changes.
Identify which date matters
A law can be published in one year and apply to employment beginning in another. A rate change can apply to existing participants while an entry-condition change only affects new arrivals. Before using a headline, identify the date of arrival, start of employment, application and income payment that the authority uses.
A concrete example: Finland
Finland reduced its key-employee source-tax rate to 25% from 1 January 2026. The authority explains that an employer can apply that rate even where an older key-employee tax card still shows 32%. The same reform also brought qualifying returning Finnish citizens into scope, with a different maximum duration from foreign citizens. A single “updated rate” field would miss that distinction. See Vero’s detailed guidance.
Check the source and the implementation
For a salary threshold, check whether the authority means gross compensation, taxable salary after relief, guaranteed monthly cash or basic salary excluding bonuses. Then check the comparison operator: “more than” and “at least” differ at the boundary. Norway’s PAYE ceiling, for example, allows income up to the ceiling; the Dutch expertise test requires taxable salary above its threshold.
How to report a correction
Send the page URL, scheme name, authority link and the sentence or result you think is wrong to contact@kattegatstudio.dk. An example salary and selected filters help reproduce a calculator problem. Do not include tax identifiers, payslips or private contracts.
Before a decision
Re-open the authority source close to the date you act. If official pages disagree, check the applicable legislation and ask the authority or your adviser which version applies to you. An old screenshot of a result is not evidence that an application will succeed.
Our methodology explains the calculation scope and exclusions. The scheme source links remain visible in results even when the site does not publish a standalone guide for that scheme.
Worked budgets are original illustrations by ExpatEngine. Authority links support the specific rules cited; the examples are not individual tax advice.