Terms of use
Updated 7 November 2026
ContractorSums is free to use. By using it you accept these terms.
Estimates, not advice
The calculators give estimates based on published UK tax rates and the assumptions stated on each page. They are not tax, financial or legal advice and don't take your full circumstances into account. Decisions about your pay, your company or your contracts should be checked with a qualified accountant or adviser.
Accuracy
I check the rates and show the source for each one. Rates change, usually in April, and I may be slow or wrong. Each page shows when it was last checked. If you spot an error, email hello@contractorsums.co.uk.
Liability
To the extent the law allows, I am not liable for any loss arising from reliance on the site. Nothing here limits liability for fraud or anything else that can't be limited by law.
Embedding
You may embed the calculators that offer an embed code on your own site, with the credit link left in place. You may not copy the site's content or code elsewhere without permission.
Law
These terms are governed by the law of England and Wales.