What is CIS Tax Deduction?

If you work in the UK construction industry as a contractor or subcontractor, you’ve likely heard of CIS – the Construction Industry Scheme. One of the main parts of this scheme is CIS tax deduction. This guide will help you understand what CIS tax deduction means, who it applies to, and how it works in practice.
What is CIS Tax Deduction?
CIS tax deduction refers to the tax taken off payments made by contractors to subcontractors for construction work. Under the Construction Industry Scheme, contractors must deduct money from subcontractors’ pay and pass it to HMRC. These deductions count as advance payments towards the subcontractor’s tax and National Insurance.
Who Does CIS Tax Deduction Apply To?
CIS tax deduction applies to both contractors and subcontractors who work in the UK construction industry. A contractor is someone who pays subcontractors for construction work, and a subcontractor is someone who gets paid for carrying out that work. CIS covers most construction activities, including building, repairs, demolition, and site preparation.
How Much is Deducted Under CIS?
The amount deducted under CIS depends on the subcontractor’s registration status with HMRC:
– 20% if the subcontractor is registered with CIS
– 30% if the subcontractor is not registered
The deduction is made from the labour cost only. It does not apply to materials or VAT if the subcontractor is VAT-registered.
When and How are CIS Deductions Made?
CIS deductions are made by the contractor every time they pay a subcontractor for work. The contractor must:
- Verify the subcontractor with HMRC
- Deduct the correct CIS tax
- Provide a payment and deduction statement to the subcontractor
- Pay the deducted amount to HMRC monthly
This process ensures the correct amount of tax is collected in advance.
How to Reclaim or Offset CIS Deductions
If you’re a self-employed subcontractor, you can reclaim your CIS deductions through your Self Assessment tax return. If you run a limited company, you can offset the deductions against your PAYE and National Insurance bill using the HMRC online portal. It’s important to keep records of all CIS statements received from contractors.
CIS Tax Deduction Example
Let’s say you’re a registered subcontractor and agree to carry out work worth £1,000 in labour. The contractor will:
– Deduct 20% of £1,000 = £200
– Pay you £800
– Send £200 to HMRC on your behalf
You’ll receive a CIS deduction statement showing this, which you can use to reclaim the £200 when filing your tax return.
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Common Mistakes to Avoid with CIS Tax Deduction
Here are a few common CIS mistakes and how to avoid them:
– Not verifying subcontractors – always check with HMRC before making payments
– Using the wrong deduction rate – confirm whether the subcontractor is registered
– Missing payment deadlines – submit deductions and pay HMRC on time
– Not issuing deduction statements – subcontractors need this for tax returns
Do You Need to Register for CIS?
Yes. Contractors must register with HMRC before they hire subcontractors. Subcontractors can also register to receive a lower deduction rate (20% instead of 30%). Registration can be done online or by contacting HMRC directly. Being registered ensures smoother payments and helps reduce the tax burden.
Conclusion: Stay Compliant with CIS Deductions
CIS tax deduction plays an important role in the UK construction industry. Understanding how it works helps both contractors and subcontractors stay on the right side of HMRC. Make sure you’re registered, apply the correct rates, and keep proper records to stay compliant and avoid penalties.
FAQs About CIS Tax Deduction
Do I still pay tax if CIS is deducted?
Yes. CIS deductions are advance payments. You still need to file a tax return and may need to pay more tax or claim a refund depending on your total income.
Can I claim back CIS deductions?
If you’re self-employed, you can claim back CIS through your Self Assessment. If you’re a limited company, you can offset it against PAYE liabilities.
What work is covered by CIS?
Most construction work including building, repairs, decorating, demolition, and site preparation.
Do materials get CIS deducted?
No. CIS deductions apply only to labour costs. Materials and VAT (if applicable) are excluded.

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