A CIS tax rebate may arise where more Construction Industry Scheme deductions have been taken from a subcontractor’s payments than are ultimately due after their tax position is calculated.
For a general explanation of how the Construction Industry Scheme works, including registration, deduction rates and gross payment status, see our Construction Industry Scheme guide.
How CIS deductions are claimed depends on how you trade. Sole traders generally claim deductions through Self Assessment, while limited companies normally report CIS deductions suffered through their payroll scheme using an Employer Payment Summary (EPS). Any remaining company overpayment may then be reclaimed from HMRC where the relevant conditions are met.
| Business Type | How to Claim CIS Back |
|---|---|
| Sole trader | Claim through Self Assessment tax return |
| Partnership | Claim through partnership/Self Assessment process |
| Limited company | Claim through monthly payroll scheme using EPS |
| Current tax year claim | May need HMRC form/process and supporting evidence |
| Missing CIS statements | Ask contractor for replacement copies |
What Exactly is a CIS tax Rebate?
A CIS rebate is, in simple terms, a tax refund that eligible construction workers can claim.
Because the Construction Industry Scheme involves tax deductions being made in advance often at higher rates than ultimately owed many subcontractors end up overpaying tax throughout the year.
By completing a Self-Assessment tax return after the end of the tax year (which runs until 5 April), you can claim back the excess tax you’ve paid. This tax refund is known as your CIS rebate.
Why Are You Entitled to a CIS tax Rebate?
There are several key reasons why subcontractors in the construction industry are frequently eligible for a tax rebate:
- Tax Has Already Been Deducted: Contractors deduct tax before paying you, often at a flat 20% rate.
- Work-Related Expenses: You may have incurred allowable expenses such as on tools, protective clothing, fuel, travel costs, and insurance which can reduce your taxable income.
- Personal Allowance: For the 2026/27 tax year, the standard Personal Allowance is £12,570, although the amount available can be reduced depending on a person’s income and circumstances. Allowable business expenses can also affect the taxable profit used to calculate the final tax position.
Once HMRC evaluates your total income, allowable expenses, and personal allowance, it often becomes apparent that you have overpaid, meaning you are due a rebate.
Practical Example of a CIS tax Rebate
Suppose a self-employed subcontractor has CIS deductions taken throughout the tax year.
When their Self Assessment return is completed, their final position is calculated using their total business income, allowable expenses and other relevant circumstances. The CIS deductions already suffered are then credited against the Income Tax and National Insurance due.
If the CIS deductions are greater than the final amount due, the difference may be repayable by HMRC. If the deductions are lower than the final liability, further tax may instead be payable.
The size of any CIS rebate therefore depends on the individual subcontractor’s actual income, expenses, deductions and wider tax circumstances.
When Can You Claim Your CIS Rebate?
For a sole trader, CIS deductions are normally dealt with through the Self Assessment tax return for the relevant tax year. A tax year ends on 5 April, and the return can be submitted once the tax year has ended and the information needed to complete it is available.
If the completed Self Assessment calculation shows that too much tax has been paid after CIS deductions are taken into account, HMRC may repay the overpayment. Processing times can vary, particularly where HMRC needs to carry out additional checks.
Limited companies follow a different process because CIS deductions suffered are generally reported through the company’s payroll scheme and Employer Payment Summary rather than through an individual Self Assessment return.
What Information Do You Need to Make a Claim?
To successfully claim your CIS rebate, you will need to gather a few important documents and details:
- CIS deduction statements from all contractors who paid you during the tax year.
- A comprehensive record of your allowable expenses (e.g., tools, fuel, travel, insurance, uniforms).
- Your Unique Taxpayer Reference (UTR) number.
Ensuring all your documents are accurate and organised will help speed up the process.
In Summary: Claiming CIS Deductions Correctly
CIS deductions are advance payments towards a subcontractor’s eventual tax and National Insurance position. Whether those deductions result in a refund depends on the individual’s final tax calculation.
For sole traders, CIS deductions are generally entered through Self Assessment alongside business income and allowable expenses. If the deductions exceed the final amount due, HMRC may repay the difference.
Keeping accurate CIS deduction statements, income records and evidence of allowable expenses can make it easier to complete the return correctly and support any repayment that becomes due.
Need Help With CIS Deductions or a Tax Return?
If you are a self-employed subcontractor and need help reporting CIS deductions through Self Assessment, our team can support you with your tax return and relevant records.
For broader guidance on CIS registration, deduction rates and gross payment status, read our Construction Industry Scheme guide. If you run a construction business and need ongoing accounting support beyond an individual CIS refund, see our construction accountants service.
