If you work under the Construction Industry Scheme (CIS), there is a strong chance you have paid more tax than you owe. Under CIS, contractors deduct tax from your pay before it reaches you, often without considering your full personal allowance or allowable expenses.
A CIS refund lets you reclaim this overpaid tax. Understanding when you can claim is essential, as timing affects both how quickly you receive your money and the process you need to follow.
This guide explains when you can claim a CIS refund, how the process differs depending on your working status, and what to consider before making a claim.
How Do CIS Deductions Work?
Under CIS, contractors deduct tax from payments made to subcontractors and send it directly to HMRC.
The standard deduction rates are:
- Twenty percent for registered subcontractors
- Thirty percent for subcontractors who are not registered.
These deductions are taken before you are paid and do not factor in your personal allowance, business expenses, or other tax reliefs. As a result, many subcontractors end up paying more tax than they should.
A CIS refund allows you to recover this overpayment.
When Can You Claim a CIS Refund?
In most cases, you can claim a CIS refund after the end of the tax year, which runs from 6 April to 5 April.
However, some people may be able to claim during the tax year, depending on their circumstances.
The correct timing depends on:
- Whether you are a sole trader or a limited company
- Whether you are still working under CIS
- How much tax has been deducted compared to what you owe.
Claiming a CIS Refund Through Self-Assessment
For most sole traders, the standard way to claim a CIS refund is through a Self-Assessment tax return.
After the tax year ends, you submit your return showing:
- Your total income
- Allowable business expenses
- CIS tax deductions from your statements
HMRC then calculates your true tax liability. If you have paid too much tax, a refund is issued.
Online returns are usually processed faster, with refunds often arriving within two to six weeks. Paper returns take longer to process.
Can You Claim a CIS Refund During the Tax Year?
In some situations, you do not have to wait until the tax year ends.
You may be able to make an in-year claim if:
- You stop working in construction.
- Your CIS deductions are much higher than your expected tax liability.
Individuals usually claim using form CIS40, while companies may use form R38.
HMRC typically requests supporting evidence such as Payment and Deduction Statements and bank records. Processing times vary, but in-year claims can sometimes result in quicker refunds.
CIS Refunds for Sole Traders
Sole traders normally claim CIS refunds through their annual Self-Assessment return.
You declare your income, expenses, and CIS deductions, and HMRC calculates whether you have overpaid tax.
Refund amounts depend on earnings and expenses but can be substantial, especially for workers with high allowable costs. Keeping clear and accurate records throughout the year helps prevent delays and complications.
CIS Refunds for Limited Companies
Limited companies reclaim CIS deductions differently.
Instead of using Self-Assessment, CIS deductions are offset against the company’s PAYE and National Insurance liabilities through payroll reporting.
Each month, payroll submissions are made to HMRC. If CIS deductions exceed what the company owes in PAYE and NICs, a refund can be requested at the end of the tax year.
Making sure all PAYE and Corporation Tax responsibilities are up to date helps avoid delays.
First-Time CIS Refund Claims
First-time claims often take longer to process.
HMRC may conduct additional checks, including verifying identity, registration status, and business records. Having your Unique Taxpayer Reference and CIS statements ready can help speed up the process.
Delays for first-time claims are common and do not usually mean there is a problem.
Seasonal and Cash Flow Considerations
For many subcontractors, CIS refunds are an important part of managing cash flow.
Some prefer to wait until the end of the tax year for a larger refund, while others use in-year claims to improve cash flow during quieter periods.
The right approach depends on your financial situation and future. If cash flow is tight, it may be worth considering your options before the tax year ends.
Common CIS Refund Delays
Refunds can be delayed for several reasons, including:
- Missing or incorrect CIS statements
- Mismatches between your records and contractor submissions
- Additional HMRC verification checks
- Late or incomplete tax returns
Keeping accurate records and submitting claims on time reduces the risk of delays.
At GM Accountants & Tax Consultants, our team of qualified accountants can support and guide you with CIS Tax returns and other tax matters, at competitive and affordable prices. For CIS Subcontractors We have special offer you do not need to pay until you get your refund. Please feel free to contact us for expert advice. If you are unable to visit our office, we can arrange a video call at a time that suits you. For further information, email us at admin@gmtaxconsultants.co.uk or call us on 020 3773 4123.
Disclaimer:
The information provided in this blog is for general informational purposes only and does not constitute professional accounting or tax advice. As individual circumstances may vary, readers are advised to contact us directly for advice tailored to their specific financial or tax situation.
