📌 Key Takeaways
- ✓CIS deductions apply only to the labor portion of an invoice, never to materials, plant hire, or VAT.
- ✓Standard registered CIS subcontractors face a 20% deduction, unverified subcontractors face 30%, and gross payment status subcontractors face 0%.
- ✓Under the VAT Domestic Reverse Charge (DRC), VAT-registered subcontractors do not charge VAT to VAT-registered contractors; the contractor accounts for it directly to HMRC.
- ✓CIS deduction is calculated on the net labor amount before VAT is considered.
- ✓Always provide a clear line-item breakdown separating labor, materials, CIS deduction, and VAT treatment on trade invoices.
1. What is the Construction Industry Scheme (CIS)?
The Construction Industry Scheme (CIS) is an HMRC tax retention mechanism designed to prevent tax evasion in the building trade. Under CIS, contractors deduct tax from payments to subcontractors and pass it directly to HMRC on account of the subcontractor’s eventual income tax and National Insurance liabilities.
CIS applies to almost all construction operations in the UK, including site preparation, bricklaying, electrical, plumbing, plastering, decorating, and demolition work.
The deduction rate depends on the subcontractor’s HMRC verification status: 0% for businesses with Gross Payment Status, 20% for standard registered subcontractors, and 30% for unverified subcontractors.
Contractors must verify each new subcontractor with HMRC before making payment to establish whether a 20% or 30% deduction rate applies.
2. CIS Deductions vs. VAT: The Crucial Differences
A frequent point of confusion is how CIS and VAT interact on an invoice. The fundamental rule is: CIS is an income tax advance payment; VAT is a consumer sales tax. They are computed completely separately.
Most importantly, CIS applies strictly to the net labor element of an invoice. Materials, consumables, fuel, equipment hire, and scaffolding are exempt from CIS deductions, provided their costs are genuinely incurred and itemized separately.
| Criteria | CIS Deduction | VAT (Value Added Tax) |
|---|---|---|
| Governing Tax Body | HMRC (Direct Taxes) | HMRC (Indirect Taxes) |
| Standard Rate | 20% (Registered) or 30% (Unregistered) | 20% (Standard) or 5% (Reduced) |
| Applicable Scope | Labor charges only | Whole supply (Labor + Materials) |
| Exempt Costs | Materials, tool hire, plant equipment | VAT exempt supplies only |
| Invoice Handling | Deducted from gross payout by contractor | Subject to VAT Domestic Reverse Charge |
3. The VAT Domestic Reverse Charge (DRC) in Construction
Since March 2021, the VAT Domestic Reverse Charge applies to most B2B supplies of construction services between VAT-registered and CIS-registered parties.
Under the reverse charge, the subcontractor does not charge or collect VAT from the contractor. Instead, the subcontractor invoices for the net service, stating the standard VAT rate (e.g. 20%) and adding a statutory reverse charge declaration. The contractor then accounts for both input and output VAT on their own quarterly VAT return.
This means as a subcontractor, you receive payment for your labor (minus CIS) plus materials, with zero VAT cash passing through your hands.
When DRC applies, your invoice must clearly state: "Reverse charge: Customer to pay the VAT to HMRC at the standard rate of 20%."
4. Worked Example: Step-by-Step Subcontractor Invoice
Consider a registered subcontractor completing a refurbishment project with £1,000 labor and £400 materials (VAT registered under DRC):
1. Net Labor: £1,000.00 | Net Materials: £400.00 | Total Net Invoice: £1,400.00.
2. CIS Deduction (20% of labor only): £1,000 × 0.20 = £200.00.
3. VAT Treatment (under DRC): 20% DRC applies (£280.00), not paid to subcontractor.
4. Payout Received: £1,000 (labor) - £200 (CIS) + £400 (materials) = £1,200.00 net cash payment from the contractor.
You can use our free UK VAT Calculator and Invoice Generator to draft professional, compliant construction invoices in seconds.
UK VAT Calculator
Calculate VAT additions, reversals, net-to-gross, and gross-to-net at standard (20%), reduced (5%), and zero rates.