What Is the Construction Industry Scheme (CIS)?
The Construction Industry Scheme (CIS) is a statutory withholding tax regime established under Chapter 3, Part 3 of the Finance Act 2004 (Sections 57 to 77) and governed by The Income Tax (Construction Industry Scheme) Regulations 2005 (SI 2005/2045). The scheme mandates that registered contractors in the UK construction sector must withhold income tax at source from payments made to subcontractors and remit those funds directly to HM Revenue & Customs (HMRC).
CIS applies to all mainstream construction contractors (businesses whose core activity is construction) as well as "deemed contractors" (large corporate entities, local authorities, or housing associations whose average annual expenditure on construction operations exceeds £3 million over the preceding 12 months under Section 59 FA 2004).
- Site preparation, groundworks, demolition, and clearance
- General building, bricklaying, joinery, and carpentry
- Plumbing, heating, ventilation, and electrical installation
- Internal finishing: plastering, painting, decorating, and tiling
- Scaffolding erection, plant operation, and structural repairs
- Professional architecture and structural engineering services
- Quantity surveying and building inspection
- Off-site manufacturing of materials, pre-fab components, or machinery
- Pure delivery of construction materials to site without installation
- Carpet fitting (unless integrated into major flooring installations)
The Three CIS Deduction Rates: 20%, 30%, and 0%
When a contractor takes on a subcontractor, Regulation 6 of SI 2005/2045 requires the contractor to verify the subcontractor with HMRC before making the first payment. HMRC verifies the subcontractor's Unique Taxpayer Reference (UTR) and National Insurance number, directing the contractor to apply one of three statutory rates:
| Deduction Rate | Verification Status | Who It Applies To | Statutory Basis |
|---|---|---|---|
| 20% Standard | Registered Subcontractor | Subcontractor registered with HMRC with an active Unique Taxpayer Reference (UTR). | FA 2004 s.61(1) |
| 30% Higher | Unregistered / Unverified | Subcontractors not registered for CIS, missing UTR, or verification failed. | FA 2004 s.61(2) |
| 0% Gross | Gross Payment Status | Subcontractors meeting HMRC turnover, business, and compliance tests. Contractor pays 100% gross. | FA 2004 s.63 |
Materials, Plant Hire & Consumables: Section 60 FA 2004
A critical rule of the Construction Industry Scheme is that CIS deductions cannot be made from materials. Under Section 60 of the Finance Act 2004, the contractor must first deduct the cost of materials and direct expenses before applying the 20% or 30% deduction rate to the remaining labour balance.
Bricks, timber, mortar, pipes, cabling, fixings, tiles, and boilers physically incorporated into the structure.
Scaffolding hire, mini-excavator hire, concrete mixers, portable generators, and access platforms hired for the contract.
Fuel consumed by on-site plant equipment (e.g. red diesel or white diesel), drill bits, saw blades, and specialist consumables.
The VAT Domestic Reverse Charge (DRC) for Construction
Since 1 March 2021, construction services fall under the VAT Domestic Reverse Charge under The Value Added Tax (Section 55A) (Specified Services and Excepted Supplies) Order 2019 (SI 2019/892). Designed to prevent "missing trader" carousel fraud, the DRC fundamentally changes how cash flows on construction invoices:
The DRC applies if all four of the following conditions are met:
- The supply of services and related materials is reported under CIS.
- The supply is taxed at standard (20%) or reduced (5%) VAT rate.
- Both the subcontractor and contractor are VAT-registered in the UK.
- The customer is NOT an "End User" or "Intermediary Supplier" who has confirmed their status in writing.
Subcontractors must state the exact VAT rate (e.g. 20%) and the amount of VAT that the contractor must pay to HMRC, but do not include this VAT in the total payment requested. The invoice must include the statutory legend:
Why Almost Every CIS Sole Trader Gets a Four-Figure Tax Refund
One of the most persistent realities for UK construction tradespeople is that registered CIS subcontractors almost always overpay tax during the year. Here is the mathematical reason why:
Contractors deduct 20% from your first day on site without applying your statutory £12,570 Personal Allowance.
Contractors cannot deduct your van running costs, tools, public liability insurance, or phone bills from payments.
Class 4 National Insurance is only 6% above £12,570, far lower than the 20% flat deduction taken at source.
• Gross Labour Invoiced: £45,000
• CIS Tax Deducted at 20% by Contractors: £9,000.00
• Legitimate Allowable Expenses (Van, Tools, Insurance): £7,500
• Net Taxable Trading Profit: £37,500 (£45,000 - £7,500)
• Tax-Free Personal Allowance: -£12,570
• Taxable Income: £24,930 (Taxed at 20% Basic Rate = £4,986.00)
• Class 4 National Insurance (6% of £24,930): £1,495.80
• Total Statutory Liability: £6,481.80
• Net HMRC Tax Refund: £9,000.00 - £6,481.80 = +£2,518.20 REBATE!
How to Claim Your CIS Tax Refund for Free (Step-by-Step)
Do not surrender 30% to 45% plus VAT of your hard-earned rebate to aggressive claims management agencies. Filing your claim directly on GOV.UK is completely free, highly secure, and ensures you retain 100% of your money.
Qualifying for CIS Gross Payment Status (0% Deduction)
If cashflow is a challenge, subcontractors can apply to HMRC for Gross Payment Status under Section 63 FA 2004. Once approved, contractors pay you in full without deducting 20% or 30%, allowing you to retain the cash and settle your tax and National Insurance via your annual SA100 return or Corporation Tax return.
Your business must carry out construction operations in the UK and operate through a dedicated UK commercial bank account.
Net construction turnover (excluding materials and VAT) of at least £30,000 for a sole trader, or £100,000 for a company (£30,000 per director).
Zero late tax returns, zero late PAYE/CIS submissions, and no outstanding tax liabilities with HMRC over the preceding 12-month period.