CIS Rebate Calculator — see what HMRC owes you
If you're a subcontractor in the Construction Industry Scheme, the 20% your contractor withheld each week wasn't your tax bill — it was a deposit. Most subcontractors can get most of it back.
Tell us roughly what you earned, what was withheld, and what expenses you racked up running the job. We'll estimate your refund using the same calculation HMRC does. Takes 60 seconds; no email needed to see the result.
Your figures (2026/27)
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Enter your figures above
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Your refund is sitting at HMRC right now.
You just need to file a self-assessment to claim it. We do this for CIS subcontractors all the time — most get their money within 4-6 weeks of us submitting.
If you have rental income, capital gains, or income over £100,000, the calculation gets more complex — book a chat for an exact figure.