VAT for CIS: Construction Reverse Charge Guide (2026)
VAT works differently in construction than in almost any other UK industry. Since 2021, most VAT-registered subcontractors no longer charge VAT to VAT-registered contractors at all u2014 instead, the contractor accounts for it directly to HMRC. Getting this wrong is one of the most common VAT mistakes small construction businesses make. This guide from Filing Accounts UK explains exactly how VAT works under the Construction Industry Scheme (CIS), using only verified facts from official HMRC guidance.
At Filing Accounts, we help construction businesses manage VAT, CIS, and Corporation Tax together. Official guidance is available at GOV.UK: VAT domestic reverse charge for building and construction services.
CIS and VAT Are Two Separate Systems
It’s worth being clear from the outset: the Construction Industry Scheme (CIS) and the VAT domestic reverse charge are two different rules that happen to overlap.
- CIS is an Income Tax deduction scheme. Contractors deduct money from a subcontractor’s payments (usually 20% for registered subcontractors, 30% if unregistered) and pass it to HMRC as an advance payment toward the subcontractor’s tax bill.
- The VAT domestic reverse charge uses CIS’s definition of “construction operations” to decide when it applies, but it’s a completely separate VAT accounting rule, not part of CIS itself.
A business can be within CIS without the VAT reverse charge applying to every transaction, and vice versa u2014 which is exactly why this area causes so much confusion.
What Is the VAT Domestic Reverse Charge?
Introduced on 1 March 2021 to combat VAT fraud in construction supply chains, the reverse charge shifts responsibility for accounting for VAT from the supplier (subcontractor) to the customer (contractor). Under normal VAT rules, a supplier charges VAT, collects it, and pays it to HMRC. Under the reverse charge, the supplier doesn’t charge VAT at all u2014 instead, the customer accounts for both the VAT due (output tax) and the VAT reclaim (input tax) on their own VAT return. For a contractor entitled to full VAT recovery, the net effect on that transaction is zero.
When Does the Reverse Charge Apply?
The reverse charge applies when all of the following are true:
- The supply is a “specified service” u2014 broadly, a CIS construction operation
- Both the supplier and the customer are VAT registered
- Both parties are registered for CIS, and the payment is reported within CIS
- The service is charged at the standard or reduced VAT rate (not zero-rated)
- The customer is not an end user u2014 i.e. they intend to make a further onward supply of construction services, rather than using the work for themselves
If any of these conditions isn’t met, normal VAT rules apply instead, and the supplier should charge VAT as usual.
Services Covered by the Reverse Charge
- Constructing, altering, repairing, extending, or demolishing buildings and structures
- Civil engineering works
- Installing heating, lighting, and air-conditioning systems
- Painting and decorating
- Scaffolding erection and dismantling
What’s Excluded
- Zero-rated construction, such as building new homes for sale u2014 normal zero-rating continues unchanged
- Professional services such as architecture, surveying, or consulting, when supplied independently of construction operations
- Workers supplied by employment businesses
- Standalone security system installation
The End User and Intermediary Exception
An end user is a customer who receives construction services for their own use, rather than passing them on as part of a further supply u2014 for example, a business having work done on its own head office. If your customer is an end user, normal VAT rules apply, and you should charge VAT as usual, not use the reverse charge.
Crucially, you can only treat a customer as an end user if they’ve confirmed this to you in writing u2014 an email or a note in the contract is sufficient. Without written confirmation, you must treat the customer as though they are not an end user, and apply the reverse charge if the other conditions are met.
How to Invoice Under the Reverse Charge
When the reverse charge applies, your invoice must:
- Include all the normal information required on a VAT invoice
- Clearly state that the reverse charge applies u2014 wording such as “reverse charge applies” or “customer to account for VAT to HMRC”
- Show the VAT rate and the VAT amount due (or clearly state the rate if the exact amount can’t be shown)
- Not include VAT in the total amount charged to the customer
If the invoice covers both reverse charge and non-reverse charge supplies, the whole invoice is generally treated as subject to the reverse charge.
How It Affects Your VAT Return
If You’re the Supplier (Subcontractor)
You don’t charge or collect VAT on reverse charge supplies, so none appears as output tax on your return for those sales. You can still reclaim input VAT on your own business purchases and materials as normal.
If You’re the Customer (Contractor)
You record both the output VAT due and the corresponding input VAT reclaim on the same return, using your accounting software’s dedicated reverse charge code for the transaction.
Impact on VAT Schemes
The reverse charge doesn’t sit well with some simplified VAT schemes:
- Cash Accounting Scheme: cannot be used for supplies subject to the reverse charge.
- Flat Rate Scheme: reverse charge sales aren’t included in your flat rate turnover, and you can’t reclaim input VAT under this scheme u2014 for subcontractors doing significant reverse charge work, this often makes the Flat Rate Scheme far less beneficial, and switching to standard VAT accounting is worth reviewing.
Cash Flow: A Key Consideration for Subcontractors
Before the reverse charge, subcontractors collected VAT from contractors and held onto it until their quarterly VAT payment was due u2014 a genuine, if temporary, cash flow benefit. Under the reverse charge, subcontractors no longer collect this VAT at all, which can turn a business into a permanent VAT repayment claimant (owed money by HMRC rather than owing it). If this applies to you, consider switching to monthly VAT returns instead of quarterly, so repayments come through faster rather than being tied up for months at a time.
Reverse Charge Checklist
| Check | Required? |
|---|---|
| Both parties VAT registered | Yes |
| Both parties registered for CIS, payment within CIS | Yes |
| Service is standard or reduced rate | Yes (not zero-rated) |
| Customer is not an end user | Yes u2014 confirmed in writing if they are |
| Invoice states reverse charge applies | Yes |
| VAT included in invoice total | No u2014 must be excluded |
Common Mistakes to Avoid
Charging VAT When the Reverse Charge Should Apply
This is the single most common error and can cause real confusion for both parties’ VAT returns if not corrected promptly.
Assuming a Customer Is an End User Without Written Confirmation
Without it in writing, you must apply the reverse charge if the other conditions are met u2014 you cannot simply assume end-user status.
Staying on the Flat Rate Scheme Without Reviewing It
Businesses with significant reverse charge income often find the Flat Rate Scheme no longer works in their favour once these sales are excluded from flat rate turnover.
Not Reviewing Cash Flow Impact
Subcontractors who don’t plan for the loss of VAT held between collection and payment can be caught out by a sudden cash flow gap.
Frequently Asked Questions
Does the reverse charge apply to all construction work?
No. It only applies to standard or reduced-rate CIS construction services between two VAT-registered, CIS-registered businesses, where the customer isn’t an end user.
What if my customer says they’re an end user?
Get this confirmed in writing, then charge VAT normally instead of applying the reverse charge.
Can I still reclaim VAT on my purchases under the reverse charge?
Yes. The reverse charge only affects how you account for VAT on the specific sales it applies to u2014 your ability to reclaim input VAT on business purchases is unaffected.
Does reverse charge income count towards the VAT registration threshold?
The value of reverse charge sales doesn’t count in the same way as normal taxable turnover for registration purposes u2014 worth checking your specific position if you’re close to the VAT threshold.
What happens if I apply the reverse charge incorrectly?
It can create errors on both parties’ VAT returns and lead to confusion or unexpected VAT bills u2014 always check with an accountant if you’re unsure.
Need Help With CIS and VAT? Talk to Filing Accounts UK
The interaction between CIS and the VAT domestic reverse charge trips up even experienced construction business owners. At Filing Accounts, we help small construction businesses set up correct invoicing, choose the right VAT scheme, and stay compliant across CIS, VAT, and Corporation Tax.
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