Picture this: you've been in construction for years. You know about CIS deductions, you've filed your Self Assessment, you understand how VAT works. Then in March 2021, HMRC changed the rules — and overnight, the way VAT flows between contractors and subcontractors became completely different.

The VAT Domestic Reverse Charge (DRC) means that if you're a VAT-registered subcontractor working under CIS, you no longer charge VAT on your invoices. The contractor handles it instead. And if you're a contractor, you now have a new VAT obligation on every qualifying payment you make to your subs.

Most of the confusion — and most of the costly mistakes — come from one of three things: applying DRC when it shouldn't apply, not applying it when it should, or issuing invoices without the mandatory wording. This guide covers all of it.

What Is the VAT Domestic Reverse Charge?

Normally, when a VAT-registered business sells a service, it adds VAT to the invoice, collects it from the customer, and pays it over to HMRC on its next VAT return. The Domestic Reverse Charge flips this.

Under DRC, the subcontractor does not charge VAT. Instead, the contractor — the one receiving the supply — accounts for the VAT on their own VAT return. They report it as if they charged it to themselves, and then (assuming they're entitled to reclaim it) they reclaim it in the same return.

The net effect for the contractor is often nil — the VAT is paid and reclaimed in the same quarter. But the cash flow impact for subcontractors is real: they no longer collect and hold VAT between invoice date and VAT payment date. That buffer disappears.

When Does the Reverse Charge Apply?

DRC applies when all five of the following conditions are met. Miss one, and normal VAT rules apply.

1. Both parties are VAT-registered in the UK

   If the subcontractor is below the VAT threshold (£90,000 turnover in 2026/27) and not registered, there is no VAT to reverse charge. DRC only operates between registered businesses.

2. The work falls within CIS scope

   The supply must be one that is reportable under the Construction Industry Scheme. This covers most construction operations — groundwork, bricklaying, roofing, electrical, plumbing, plastering, and so on. Supply of materials-only or professional services such as surveying are generally excluded.

3. The services are standard-rated or reduced-rated for VAT

   Zero-rated supplies (e.g. certain new build residential construction) are not subject to DRC. Check HMRC VAT Notice 708 if your work may be zero-rated.

4. You are not an employment business supplying workers

   If you supply labour-only workers who work under the contractor's direction (a labour-only agency arrangement), DRC does not apply. The distinction matters if you use gang-style labour supply arrangements.

5. The customer is not an end user

   This is where most people get caught. If your contractor customer is building something they will occupy and use themselves (not sell on or let out commercially), they may be an end user — in which case normal VAT applies. End user status must be confirmed in writing by the customer.

If You're a Subcontractor: What Actually Changes

The practical change is simple but significant: you stop adding 20% VAT to your invoices for qualifying work. Your invoice shows the net amount only. No VAT charged. No VAT collected. No VAT to pay over to HMRC from that job.

What does a correct DRC invoice look like?

Three things that invoice must include:

• The net amount only — no VAT added to the total
• A statement of the VAT rate that would have applied (20% in most cases)
• The mandatory wording: "Reverse charge: customer to account for VAT to HMRC"

The Cash Flow Impact Is Real — Here's the Numbers

Before DRC, VAT worked like an interest-free loan from your contractors. You invoiced £3,000 + £600 VAT, collected £3,600, and had up to three months before you paid HMRC. That £600 sat in your account, available for materials, fuel, or wages. Multiply that across a full quarter of work, and many subcontractors were holding £3,000–£6,000 of HMRC's money at any given time — effectively a free working capital buffer.

Under DRC, that buffer disappears overnight.

The upside — and it is a real one — is that you may now be in a permanent repayment position. If your input VAT (materials, fuel, tools) exceeds your output VAT, HMRC owes you money every quarter. You can request monthly VAT returns to get that repayment faster rather than waiting 90 days. For a subcontractor spending £1,500/month on materials at 20% VAT, that's £300 back from HMRC every quarter — or £100/month if you switch to monthly filing.

If You're a Contractor: Your New VAT Obligation

When you receive a DRC invoice from a subcontractor, you do not pay VAT to the subcontractor. Instead, you account for it yourself on your VAT return — reporting it as both output tax (Box 1) and input tax (Box 4) in the same period.

For most VAT-registered contractors, the net cash impact is zero: the VAT in and the VAT out cancel each other out. But the reporting obligation is real, and getting the VAT return boxes wrong is one of the most common DRC compliance errors.

Which VAT Return Boxes Are Affected?

This is where many contractors make errors. Here is what goes where:

The Four Most Expensive DRC Mistakes

1. Charging VAT when you should be using DRC

If you apply standard VAT to an invoice that should use DRC, the contractor is entitled to refuse payment of the VAT element. You'll need to issue a credit note and a corrected invoice. If the VAT was already paid and accounted for incorrectly, both parties face compliance risk. This is the most common mistake, especially among subcontractors who weren't aware the rules changed.

2. Using DRC when you shouldn't — the end user error

If your contractor is an end user (confirmed in writing), you should charge them VAT normally. Applying DRC to an end user means they never account for the VAT — which means HMRC is owed money that nobody paid. That becomes your liability. Always verify end user status before issuing invoices.

3. Missing the mandatory invoice wording

A zero-VAT invoice without the reverse charge statement is not compliant. HMRC requires the words "Reverse charge: customer to account for VAT to HMRC" to appear on the invoice. Without it, the contractor may not know to account for the VAT — which could trigger an HMRC enquiry into both businesses.

4. Wrong VAT return boxes (contractor side)

Contractors sometimes add the subcontractor's net invoice value into Box 6 (as if it were their own sales). That is wrong. Box 6 is for your own outputs — sales you made. The sub's invoice goes into Box 7 only. Getting this wrong inflates your declared sales and can trigger unnecessary VAT assessments.

DRC and CIS Deductions — Two Completely Separate Things

This causes confusion more often than anything else. Here is the clear answer:

CIS deductions are calculated on the labour element of your invoice only — at 20% if you're registered, 30% if you're not. They are applied regardless of VAT treatment.

In the invoice example above (£2,400 labour + £600 materials = £3,000 total), the CIS deduction applies to £2,400 only — regardless of whether DRC or standard VAT applies. Materials are always excluded from CIS deductions.

When Does DRC Not Apply?

It is just as important to know when not to use it. Normal VAT rules apply in these situations:

• Either party is not VAT-registered
• The work is not within CIS scope (e.g. professional services, materials-only supply)
• The supply is zero-rated (e.g. certain new-build residential work)
• The customer has confirmed in writing they are an end user
• The customer has confirmed in writing they are an intermediary supplier who will not alter the building supply
• You are an employment business supplying workers (not completing construction work directly)

Your DRC Compliance Checklist

For subcontractors — before each invoice:

• Confirm the contractor is VAT-registered (ask for their VAT number)
• Confirm the work is CIS-reportable
• Confirm the contractor is not an end user (get it in writing)
• Issue the invoice showing net amount only — no VAT added
• Include the VAT rate that would have applied (20%)
• Include the mandatory wording: "Reverse charge: customer to account for VAT to HMRC"
• Clearly separate labour and materials on the invoice (CIS deduction applies to labour only)

For contractors — on your VAT return:

• Report the reverse charge VAT amount in Box 1 (output tax)
• Reclaim the same amount in Box 4 (input tax)
• Include the net value of the subcontractor's invoice in Box 7 only
• Do NOT include the subcontractor's net invoice in Box 6
• Apply the CIS deduction to the labour element of the invoice before payment
• Issue payment and deduction statements to subcontractors within 14 days of month end