CIS Rebate Calculator was built to help UK construction subcontractors quickly estimate their CIS tax rebate — for free. Thousands of plumbers, electricians, plasterers and other tradespeople overpay CIS tax every year simply because they do not know how much they are owed. We built this tool to fix that.
Our mission
To give every UK construction subcontractor fast, free access to an accurate CIS rebate estimate — without needing to pay an accountant just to find out if they are owed money.
Always free
CIS Rebate Calculator will always be free to use. We are supported by advertising — you will never hit a paywall or be charged to see your estimate.
Your privacy
We do not store, log or share any financial figures you enter. All calculations happen locally in your browser — we never see your data, ever.
Important disclaimer
CIS Rebate Calculator provides estimates only and does not constitute tax advice. Always consult a qualified accountant or contact HMRC directly to submit your Self Assessment return.
Built for UK tradespeople
We cover every trade in the construction industry