How to report an error
Use the contact page. Please include the page, the inputs you used (the "Copy link" button under each result saves them in the address), the figure you expected and where it comes from — a payslip, a notice of assessment or the tax authority's own calculator.
What happens next
- We reproduce your inputs and compare the result with the official source.
- If the calculator is wrong, we fix the rules or the method, add a test for your case so the error cannot come back, and republish.
- If the difference comes from something the calculator does not model (a benefit in kind, a cumulative payroll adjustment), we reply with the explanation and consider adding the option or a clearer note.
- Every fix to a published figure is listed below.
Correction log
No corrections to published figures have been needed so far.
Routine updates for new tax years and rate changes are listed in the changelog.