If you work in the construction industry, you’ll already know that tax compliance comes with its own set of rules. Two of the most important ones are the Construction Industry Scheme (CIS) and the VAT reverse charge for building and construction services. Both can feel complicated, but understanding them is vital for staying compliant and keeping cash flow on track.
The Construction Industry Scheme (CIS) – a quick refresher
The CIS was introduced by HMRC to tackle tax evasion in construction. It sets out special rules for how payments to subcontractors must be handled.
Who it applies to: Contractors must register with HMRC and deduct tax from payments made to subcontractors for construction work. Subcontractors can also register to reduce the rate of tax deducted.
How it works:
Standard deduction: 20% from payments to registered subcontractors.
Higher deduction: 30% if the subcontractor isn’t registered.
Gross payment status: Some subcontractors can qualify to be paid in full (with no deductions) if they meet HMRC’s criteria.
These deductions are passed directly to HMRC and count towards the subcontractor’s tax and National Insurance bill.
The VAT Reverse Charge – tackling missing trader fraud
Since 1 March 2021, the VAT reverse charge has applied to many construction services that fall under CIS. It was designed to combat “missing trader” VAT fraud in the construction supply chain.
How it works: Instead of the supplier charging VAT and passing it to HMRC, the customer (contractor) accounts for the VAT on their VAT return.
The supplier invoices net of VAT, and the contractor both:
Accounts for the VAT as output tax, and
Reclaims it as input tax (subject to normal VAT rules).
This means no VAT cash passes between supplier and customer.
When the VAT reverse charge applies
The reverse charge applies when:
Both supplier and customer are VAT registered in the UK.
The work is within the scope of CIS.
The invoice is for construction services (not just materials).
The customer is not the end user (the business or organisation that actually uses the building or services).
If the customer is an end user or intermediary supplier, the supplier should be told in writing so VAT can be charged in the normal way.
Common pitfalls to avoid
Mixing up VAT and CIS – They’re separate rules, but they can apply to the same transaction. For example, you may need to deduct CIS tax and also apply the VAT reverse charge.
Not confirming end user status – Always check with your customer whether they are the end user before deciding how to invoice.
Cash flow surprises – Subcontractors may find they no longer receive VAT on their invoices, which can affect working capital.
Practical tips for businesses
Make sure your accounting software is set up for reverse charge transactions.
Keep clear records of CIS deductions and VAT treatment.
Double-check the status of subcontractors with HMRC’s CIS online service.
Review your contracts to see where reverse charge VAT applies.
Final thoughts
CIS and the VAT reverse charge add extra layers of complexity for contractors and subcontractors, but with the right systems in place, they don’t have to be a headache. Getting them wrong, however, can lead to HMRC penalties and cash flow issues.
If you’re unsure about how these rules apply to your projects, it’s always best to seek advice early.
👉 Our team can help you stay compliant, streamline your CIS reporting, and make sure your VAT treatment is correct.
Aim to keep at least 1–3 months' worth of essential expenses set aside. It takes time, but having that buffer means you can weather slow periods or surprise costs without panic.
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