Editorial standards

Every number on this site should be traceable to a primary source. This page explains how we get there and how to hold us to it.

Last reviewed: 2026-08-01

Sourcing

Statutory figures come from the body that sets them, never from another calculator site or a content aggregator. In practice that means:

  • United Kingdom: HMRC rates and thresholds, GOV.UK guidance, Scottish Government income tax policy.
  • Germany: § 32a EStG tariff formula, Bundesministerium für Finanzen publications, statutory insurance contribution rates and thresholds.
  • Turkey: Gelir İdaresi Başkanlığı (GİB) communiqués, SGK circulars, the minimum wage commission decision.
  • Other EU countries: the national tax authority for VAT rates and identifier rules.
  • Exchange rates: the European Central Bank euro reference rates.
  • Health formulas: the original published paper or the standard-setting body, named on the page.

Review cycle

Country tools carry the tax year they implement. We review them at the start of each relevant tax year, after any budget or in-year change, and whenever a reader reports a discrepancy. Pages show a review date so you can judge how fresh the figures are.

Corrections policy

If a published figure or formula is wrong we fix it as a priority, usually within the same week. Where a correction materially changes results, we update the review date and, for significant issues, describe the change on the page. We do not quietly delete pages to hide an error.

To report one, email support@ayduke.com with the tool, your inputs, the expected result and your source.

What we will not publish

  • Sponsored articles, paid links or third-party press releases.
  • Content written to fill space rather than answer a question.
  • Financial, medical or legal advice dressed up as a calculator result.
  • Scare tactics, fake urgency or misleading claims about what a tool can do.

Independence

Advertising is served programmatically and no advertiser can influence a calculation, a recommendation or the wording of a page. Ad units are labelled and kept out of results. Legal, contact and policy pages carry no advertising at all.

Translation

Localisation is not a wrapper around English text. A language is only published for a tool when its interface, copy and country-specific rules have been prepared for that language — which is why a tool may appear in English before it appears in Turkish or German, and why you will not land on a half-translated page.