We read every message. The FreeKalc team builds and maintains every calculator on this site, so questions, corrections and feature requests all reach the people who write the code.
Get in touch
- Email: contact@freekalc.com — for questions, feedback and partnership enquiries.
- Corrections: found an outdated tax rate, an odd rounding or a bug? Email us the calculator's name and the figure that looks wrong. Tax rules change every year across the US, UK, Germany, Ireland and Spain, so we audit our calculators against official sources (HMRC, the IRS, gesetze-im-internet.de, Revenue.ie and the Seguridad Social) and ship fixes within a week of a confirmed change.
- Feedback: tell us which calculator you'd like next, or which country's tax system we should cover.
- Widget & embedding: every calculator can be embedded on your own site via our embed mode — just ask and we'll help you set it up.
What to expect
We typically reply within 2 business days. Correction reports are triaged the same day and fixed within a week when confirmed against an official source.
Editorial standards
Our tax figures are checked against primary government publications and each calculator lists its methodology. See our editorial policy, calculation methodology and about page for details on how FreeKalc is funded and how content is kept current.
Last updated: October 2026.