CIS Tax Refunds – Are you owed money?

Every year, thousands of subcontractors and small contractors overpay tax under the Construction Industry Scheme (CIS) leading to unclaimed CIS tax refunds that could be worth thousands of pounds. If you work in construction, you probably have 20% or even 30% of your income deducted at source — often more than you owe once business expenses are included. That’s where a CIS tax refund comes in.

By claiming back overpaid tax through self-assessment or a company refund, you can recover money that’s rightfully yours. Timeframes vary; straightforward claims often complete within a few weeks, but HMRC processing can take longer.

This article explains how CIS tax refunds work, why overpayments happen, and how to make sure you get back every pound you’re owed.

What Is a CIS Tax Refund?

The Construction Industry Scheme (CIS) is how HMRC collects tax from construction subcontractors. Contractors deduct money from your payments and send it directly to HMRC.

CIS deduction rates are 20% for registered subcontractors, 30% if you’re not registered, and 0% if you hold gross payment status. You can check the official details in HMRC’s CIS guidance on deductions and payments.

These deductions count as advance tax payments, meaning that when you file your tax return, HMRC compares what you’ve already paid against what you actually owe. If too much tax has been deducted, you’re due a CIS tax refund.

Overpayments are common because subcontractors cover their own expenses, such as tools, fuel, protective clothing, materials, and insurance, all of which reduce taxable profit.

To understand more about how deductions work, see our article on CIS Deductions & Claiming Back: Unlocking Your Tax Refunds or refer to HMRC’s CIS refund guidance.

Why Subcontractors Often Overpay CIS Tax

CIS deductions are based on what you’re paid, not on your actual profit and that’s why many subcontractors end up giving HMRC too much.

Common reasons for CIS overpaid tax include:

• Unclaimed expenses – costs for fuel, travel, PPE, tools, and materials often go unrecorded.
• Incorrect deductions – contractors sometimes take too much CIS or use the wrong rate.
• No deduction statements – without official CIS statements, claims are delayed or miscalculated.
• Changing work patterns – seasonal or short-term jobs can mean deductions don’t match annual income.
• Late registration or updates – if you’re not registered, 30% may be deducted instead of 20%.

Even small errors can add up. A subcontractor earning £45,000 might have £9,000 deducted under CIS but owe only £6,000 after expenses, a £3,000 refund waiting to be claimed.

Accurate records and professional review make the difference between an average claim and a full refund.

How to Claim a CIS Tax Refund

The process depends on whether you’re self-employed or operating through a limited company but the goal is the same: to recover tax that’s already been deducted.

If you’re self-employed (sole trader):

• File your Self Assessment tax return for the tax year (6 April to 5 April).
• Include all income, CIS deductions, and allowable expenses.
• HMRC will calculate your total tax liability and issue a refund if you’ve overpaid.
• Refunds are paid directly to your bank once the return is processed.

If you’re a limited company:

• Report CIS suffered through your PAYE each month on the Employer Payment Summary (EPS) so HMRC can set it against PAYE/NIC liabilities.
• If CIS suffered exceeds those liabilities, request a repayment or set-off at year end via your business tax account (or through your agent).
• For full instructions, see HMRC’s guide to claiming CIS refunds for limited companies.

To prevent delays, always double-check that:

• Your Unique Taxpayer Reference (UTR) is correct.
• All CIS deduction statements are complete.
• The figures on your return match what HMRC already holds.

A complete and accurate claim speeds up repayment and avoids unnecessary HMRC queries.

What You Can Claim For

A successful CIS repayment claim depends on claiming every legitimate expense that reduces your taxable profit. Many subcontractors miss out simply because they don’t keep full records.

You can normally claim for:

• Travel and mileage to and from work sites.
• Tools and equipment used for your trade.
• Protective clothing (PPE) and uniforms.
• Materials and consumables paid for personally.
• Public liability insurance and professional cover.
• Accountancy fees related to CIS returns.

All these costs reduce your taxable income, increasing the refund you’re due.

Keep receipts and invoices for every item, including digital copies. HMRC can request evidence before processing a claim. For tailored advice on maximising deductions and ensuring full compliance, see our tax compliance and planning services.

CIS Refunds for Limited Companies vs Sole Traders

How you claim your CIS tax refund depends on whether you work as a sole trader or through a limited company. The principles are similar, but the process differs.

Sole traders and self-employed subcontractors

• Claim CIS refunds through the annual Self Assessment.
• Include income, deductions, and allowable expenses.
• HMRC pays refunds directly to your nominated bank account once your return is processed.

Limited companies and contractors

• CIS deductions from payments received throughout the year are reported monthly on CIS returns and the EPS.
• HMRC offsets these against PAYE, VAT, or Corporation Tax before paying any remaining balance.

If you’re repeatedly deducted at 30%, register for CIS immediately to switch to 20% and improve cash flow. See HMRC’s guidance for CIS subcontractors.

If you qualify for gross payment status, contractors pay you without deductions and you settle tax through your own returns.

In all cases, accurate records and matching CIS statements are essential.

If you operate through a company or are unsure how to claim, our construction industry accounting specialists can manage the process and ensure your repayment is processed quickly and correctly.

Avoiding Mistakes and Delays

Most CIS refund delays happen because of missing paperwork or incorrect figures. HMRC cross-checks everything against contractor submissions, so even small discrepancies can hold up your claim.

Avoid common issues by checking:

• All CIS statements match the figures submitted by your contractors.
• UTR and National Insurance details are correct on every return.
• Expenses are backed by invoices or receipts — not estimates.
• Bank details on your tax return match HMRC records.
• Agents you use are reputable and HMRC-registered.

Be wary of “fast refund” services that promise inflated repayments. HMRC has warned about CIS refund scams targeting subcontractors. Only claim what you can prove, otherwise, repayments may be delayed or reclaimed later.

HMRC warns that false or exaggerated CIS refund claims can trigger penalties and repayment demands. Always use a qualified accountant or HMRC-registered tax agent, and avoid anyone promising unusually large refunds or charging high percentage-based fees.

Getting professional support helps avoid errors and ensures your refund is calculated accurately the first time.

How Nichols & Co Can Help

CIS tax refunds are one of the most common areas where construction workers lose money, not because they’re ineligible, but because claims are incomplete or delayed.

At Nichols & Co, we help subcontractors and contractors recover every pound they’re owed, quickly and correctly. Our team reviews your CIS statements, checks expenses, and prepares accurate submissions that pass HMRC checks without delay.

Whether you work as a sole trader or through a limited company, we can:

• Calculate overpaid tax and prepare full repayment claims.
• Handle HMRC correspondence on your behalf.
• Ensure compliance with CIS and self-assessment requirements.

Our construction industry accountants and tax compliance specialists make the refund process straightforward and stress-free.

If you think you’ve overpaid tax under the CIS, contact us today to get your refund started.

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Disclaimer: This article has been prepared by Nichols & Co to provide general information on CIS tax refunds and related tax compliance topics. It is not intended to be, and should not be relied upon as, legal or financial advice. Professional advice tailored to your circumstances should always be sought before taking action.