CIS Tax Rebate UK: How Much Can Construction Workers Claim Back?

Most CIS construction workers are overtaxed at source by their contractors — and are owed a significant rebate from HMRC. Our average CIS client gets £2,500 back. This guide explains how CIS tax works, what expenses you can claim, and how Accounted4Tax gets you the maximum refund.

What Is CIS Tax and How Does It Work?

The Construction Industry Scheme (CIS) is a system operated by HMRC where contractors deduct tax from subcontractors' payments before paying them. Rather than receiving your full invoice amount, contractors deduct either 20% (if you are registered for CIS) or 30% (if you are not registered) from your labour payments and send this directly to HMRC.

This deduction is not your final tax bill — it is simply an advance payment towards your tax liability for the year. In most cases, the amount deducted is more than you actually owe, which means you are entitled to a CIS tax rebate from HMRC.

How Much Can CIS Workers Claim Back?

The amount you can reclaim depends on your total income for the year, your allowable business expenses, and the total CIS tax deducted by your contractors. At Accounted4Tax, our average CIS client receives £2,500 back from HMRC — and many receive significantly more when all allowable expenses are properly identified and claimed.

The key to maximising your CIS rebate is making sure every single allowable expense is included in your Self Assessment tax return. This is where using a specialist CIS accountant makes an enormous difference compared to filing yourself.

What Expenses Can CIS Subcontractors Claim?

As a self-employed CIS subcontractor, you can offset a wide range of allowable business expenses against your income, which directly reduces the amount of tax you owe and increases your rebate. Common claimable expenses include:

• Tools, equipment and plant hire used for your work

• Specialist clothing, safety equipment and PPE

• Vehicle costs including fuel, insurance, servicing and repairs (business use proportion)

• Travel to temporary workplaces — but not your regular place of work

• Mobile phone bills (the business use proportion)

• Public liability insurance and other trade insurances

• Training courses directly related to your construction work

• Accountancy fees — including the cost of Accounted4Tax preparing your return

• Business bank charges and relevant subscriptions

Many CIS workers filing their own returns miss entire categories of expenses — particularly vehicle costs, travel, and equipment — which can cost them hundreds or even thousands of pounds.

When Can I Claim My CIS Tax Rebate?

The UK tax year runs from 6th April to 5th April. Once the tax year ends on 5th April, you can file your Self Assessment tax return for that year and claim your CIS rebate. HMRC typically processes refunds within 4 to 6 weeks of the return being submitted.

There is no reason to wait until the January deadline — the earlier you file, the earlier your money arrives. At Accounted4Tax, we prepare and submit CIS returns promptly after the tax year ends to get your refund to you as quickly as possible.

Do I Need a UTR Number to Claim My CIS Rebate?

Yes — to claim your CIS tax rebate you must be registered for Self Assessment with HMRC and have a UTR (Unique Taxpayer Reference) number. If you do not yet have a UTR number, Accounted4Tax handles UTR registration for you. We submit your registration to HMRC, monitor the process, and let you know as soon as your UTR arrives.

What Do I Need to Provide to Claim My Rebate?

To prepare your CIS tax return, we will need:

• Your CIS payment and deduction statements from all contractors you worked for during the year

• Details of any other income you received during the year

• A list of your business expenses, or bank statements so we can identify them

• Your UTR number and National Insurance number

• Your bank account details so HMRC can send your refund directly to you

You can send everything to us via email or WhatsApp — we make the process as simple as possible.

What Is the Difference Between Gross and Net CIS Status?

When you register for CIS, HMRC assigns you a payment status. Gross payment status means your contractors pay you in full with no tax deducted. Net payment status means contractors deduct 20% from your labour payments — the standard position for most subcontractors.

To qualify for gross payment status, you need to meet certain HMRC criteria around turnover, business banking, and tax compliance history. Accounted4Tax can advise whether you qualify and help you apply if appropriate.

Making Tax Digital and CIS Workers

From April 2026, CIS workers whose total self-employment income exceeds £50,000 will need to join Making Tax Digital for Income Tax. Rather than one annual Self Assessment return, you will file quarterly updates to HMRC using approved software. Accounted4Tax offers MTD plans from £24 per month and handles all submissions for you.

Start Your CIS Tax Return With Accounted4Tax

Do not leave money on the table. Our average CIS client gets £2,500 back. Start your CIS Self Assessment tax return from £99, or book a free consultation and we will explain exactly how much you are likely to receive back and how the process works. Call us on 07563 811938 or WhatsApp us today.