CIS tax refund calculator
Contractors take CIS off your pay as an advance on your tax. Most subcontractors have too much taken and are owed money back, a CIS tax refund, or rebate as it is often called. Put in three figures to estimate yours.
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Enter your income and the CIS deducted, and your estimated refund appears here with a full breakdown.
Want to understand how it works?
The full guide covers why refunds happen, how expenses raise what you get back, how to claim through Self Assessment, how long it takes, and how it differs for a limited company.
Read the CIS refund guide →An estimate for a sole trader, using the HMRC Personal Allowance, Income Tax bands for England, Wales and Northern Ireland, and Class 4 National Insurance rates for the 2025/26 and 2026/27 tax years, which are frozen at the same figures. Scotland has different bands. It leaves out Class 2 National Insurance, student loan repayments, payments on account, other income and allowances, so your real figure will differ, and limited companies claim differently. This is not tax advice, so check your position with HMRC or your accountant before you file. Source: HMRC pay tax and claim back CIS deductions (GOV.UK)
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