Contact

The fastest way to reach us is by email: hello@centexact.com.

Reporting an error

Please include the calculator address, what you expected, and the source of that figure, such as an official worked example or an anonymised statement. Copy link to this result includes your inputs, so use example figures if you do not want to disclose your salary, debt or savings. Remove names, account numbers and other identifying details from any supporting document.

Requesting a calculator

Tell us what you are trying to work out and, if you have one, a source for the formula or rules. Requests that many people share move up the list.

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Response time

Replies may take a few working days. For an urgent tax, payment or borrowing question, contact the relevant institution directly.