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Your feedback helps us improve our tools.

Online service available worldwide. Country-specific tools are clearly labelled.

The fastest way to reach us is by email. To help us respond quickly, please include:

Calculation issues: the calculator link, the inputs you used, and the result you expected.
Content corrections: the page, the statement, and a source such as an official circular or notification.
Suggestions: the calculator or guide you would like us to add or improve.

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See our corrections policy for how reported errors are reviewed and fixed.