Editorial policy

Data sources

Figures come only from government statistics, public agencies or official documents that can be checked. Each site shows its source and reference date. When a value cannot be confirmed we leave it out or label it unconfirmed rather than estimate. Sources for each site are listed in the table on the home page.

Updates

Calculators that depend on published statistics or rates are updated when new data is released, and the reference year is shown. Guides show the date they were last reviewed.

How guides are written

Guides are based on the data and calculation methods the sites actually use. We use generative AI to help draft them. Each draft is checked against the source material and statements we cannot support are removed. Worked examples use only numbers found in the source data.

Corrections

If you spot an error, email us at the address on the contact page. Once confirmed, we correct the text and update the review date.

Advertising and affiliate disclosure

Our sites may show Google AdSense ads and some pages may contain affiliate links, which are labelled where they appear. Advertisers and partners have no say over our content.

Disclaimer

Results and guides are for general reference only and have no legal effect. Real costs, taxes, premiums and fees depend on your situation and on the rules of the relevant authority; confirm important decisions with that authority or a professional.