The VAT domestic reverse charge for building and construction services took effect on 1 March 2021, and it moved responsibility for accounting for VAT from the supplier to the customer on most construction supplies within the Construction Industry Scheme [1]. HMRC introduced the measure to tackle missing trader fraud, where a supplier charged VAT, collected it from a customer, then disappeared without paying it over [9]. For any business paying or supplying construction labour, the rule reshaped how VAT flows through the supply chain.
The reverse charge is not a CIS deduction, and the two are often confused. CIS governs the income tax withheld from a subcontractor's labour payment, while the reverse charge governs which party accounts for VAT on the same invoice [3]. The scope of the two schemes overlaps closely, which is why they share the "CIS reverse charge" shorthand, but the mechanics are separate.
This article sets out who must apply the reverse charge, which services fall inside and outside it, the end user and intermediary supplier exemptions, the 5% rule, how to invoice correctly, and how the charge is reported on the VAT return. It also covers the cash flow effect on subcontractors and the errors that most often trigger HMRC correction.
Key takeaways
- The VAT domestic reverse charge applies to most standard-rated and reduced-rated construction supplies between two VAT-registered businesses reported under CIS.
- Under the reverse charge the customer accounts for the VAT, and the supplier issues an invoice showing no VAT charged but stating the reverse charge applies.
- The charge does not apply to end users or intermediary suppliers, provided they confirm their status in writing.
- Where reverse charge work is 5% or less of the total invoice value, normal VAT rules can apply to the whole supply.
- Subcontractors lose the cash flow benefit of holding output VAT, and many move to monthly VAT returns to recover input tax faster.
What the CIS reverse charge is
The domestic reverse charge is a VAT accounting mechanism, not a new tax. On a standard supply, the supplier charges VAT, collects it from the customer, and pays it to HMRC. Under the reverse charge, the supplier charges no VAT on the invoice, and the customer accounts for both the output VAT and the corresponding input VAT on its own VAT return [1]. The customer becomes liable to account to HMRC for the VAT on the purchase rather than paying it to the supplier [2].
The rule exists because construction has long carried a high level of VAT fraud. By removing the point at which cash VAT changes hands between businesses, HMRC removed the opportunity for a fraudulent supplier to collect VAT and vanish [9]. The measure was announced well in advance and its start date was moved twice before it finally applied from 1 March 2021 [9].
How it links to CIS
HMRC deliberately tied the reverse charge to the Construction Industry Scheme to give businesses a scope they already understood. The general rule is that supplies which come under CIS usually come under the construction reverse charge, and supplies which do not come under CIS do not come under the reverse charge [1]. A contractor that already reports a payment through CIS should therefore expect the reverse charge to apply to the VAT on that same payment [3].
The two schemes are not identical in every respect, so the alignment is a strong guide rather than an absolute rule. The reverse charge only reaches supplies that are standard-rated or reduced-rated for VAT, whereas CIS reaches payments regardless of their VAT treatment [2]. A business new to the wider scheme should read the mechanics of payroll for construction and CIS before layering the VAT rules on top. A business handling both schemes correctly needs to check the VAT liability of each supply as well as its CIS status. Firms that manage construction payments alongside PAYE often centralise this in payroll software for SMEs that keeps CIS and payroll records in one place.
When the reverse charge applies
The reverse charge applies only when a set of conditions is met at the same time. HMRC sets out the tests that a supply must pass before the charge bites, and if any single test fails, the supplier charges VAT in the normal way [1]. The table below summarises the conditions.
| Condition | Reverse charge applies when |
|---|---|
| VAT registration | Both supplier and customer are UK VAT registered |
| CIS reporting | The payment is reported within the Construction Industry Scheme |
| VAT rate | The supply is standard-rated or reduced-rated (not zero-rated) |
| Service type | The service is a specified construction service |
| Customer status | The customer is not an end user or intermediary supplier |
All of these conditions must hold together [1]. The most common trigger is a subcontractor supplying labour to a contractor who will use that work in an onward construction supply, because in that chain the customer is neither the final consumer nor an end user [6].
Services covered
The reverse charge covers most building and construction work. It includes constructing, altering, repairing, extending, demolishing or dismantling buildings or structures, whether they are permanent or not, along with works forming part of the land such as walls, roadworks, power lines and drainage [4]. Installation of heating, lighting, air conditioning, ventilation, drainage and similar systems also falls within scope, as does internal cleaning carried out during construction work [4].
Materials supplied with those services follow the treatment of the labour. Where a supplier provides construction services and also supplies materials used in that work, the whole supply, materials included, falls under the reverse charge [7]. A supply of materials on their own, with no construction service attached, is not caught [7].
Services excluded
Several categories of work sit outside the reverse charge even when they take place on a construction site. Professional and advisory services are the largest exclusion: the work of architects, surveyors, and consultants in building, engineering, interior or exterior decoration and landscape design is outside the charge [4]. The manufacture and delivery of materials, drilling for oil or gas, and the installation of security systems are also excluded [4].
Zero-rated construction is a separate and important exclusion. Because the reverse charge only affects supplies that carry VAT, a zero-rated supply, such as the construction of a new dwelling, has no VAT to account for and is therefore outside the charge [8]. A supplier working on a new build should confirm the zero-rating in VAT Notice 708 before deciding the reverse charge does not apply [10].
The end user and intermediary exemptions
The reverse charge is designed to run through a chain of construction businesses and to stop at the customer who consumes the work. That customer is the end user, and supplies to an end user are excluded from the charge [5]. The exemption is what keeps the charge from reaching a business that is simply having work done for its own use rather than reselling it.
End users
An end user is a business, or a group of businesses, that is VAT and CIS registered but does not make onward supplies of the construction services it receives [5]. A property developer having its own head office refurbished is a typical example, because the refurbishment is consumed by the business rather than sold on [1]. The reverse charge does not apply to a supply to an end user once the end user has told its supplier in writing that it holds that status [5].
The written notification is the operative step. Until the customer confirms in writing that it is an end user, the supplier is expected to apply the reverse charge, because the supplier cannot know the customer's intended use of the work [1]. A prudent supplier keeps that confirmation on file to support its decision to charge VAT normally [2].
Intermediary suppliers
An intermediary supplier is a VAT and CIS registered business connected or linked to an end user, which buys construction services and supplies them on to that end user without material alteration [1]. To be connected or linked, the intermediary must either hold a relevant interest in the same land as the end user, for example as landlord and tenant, or be part of the same corporate group [1]. Intermediary suppliers are treated in the same way as end users, so supplies to them are excluded from the reverse charge once status is confirmed in writing [2].
The two exemptions share the same practical rule: the customer, not the supplier, carries the knowledge of its own status, so the customer must declare it. A supplier that receives no written statement treats the customer as a normal reverse charge customer [1]. Accountants managing this across several construction clients often standardise an end user statement template so no supply is misclassified, a discipline supported by a multi-client payroll dashboard that keeps each client's CIS and VAT status on record.
The 5% rule
Mixed invoices, where some work falls under the reverse charge and some does not, are common on real jobs. The 5% rule exists to spare businesses from splitting every invoice into taxable fragments. Where the reverse charge element of a supply is 5% or less of the total value of the invoice, the whole supply can be treated under normal VAT rules [1].
The rule works in one direction only. It allows a small reverse charge element to be absorbed into a mainly normal supply, but it does not allow a small non-reverse-charge element to be absorbed into a mainly reverse charge supply [2]. Where reverse charge work makes up more than a trivial share of the invoice, the reverse charge applies to the reverse charge element as usual. HMRC also allows businesses in a regular relationship to agree that the reverse charge applies to all their supplies for simplicity, rather than testing each invoice against the 5% threshold [2].
Invoicing and VAT return reporting
The reverse charge changes both the invoice a supplier issues and the boxes each party completes on the VAT return. Getting the invoice wording right is the supplier's responsibility, and getting the return entries right falls on both parties.
What the invoice must show
A reverse charge invoice must make clear that the customer is responsible for the VAT. It must state that the reverse charge applies, using wording such as "reverse charge: customer to account for VAT to HMRC", and it must show the VAT rate or the amount of VAT due, even though that VAT is not added to the total the customer pays [1]. The invoice total the customer settles therefore excludes the VAT [2].
The reverse charge does not change the CIS treatment shown on the same document. A subcontractor's invoice still shows the labour element from which CIS is deducted, and the CIS deduction is calculated on the payment excluding VAT [11]. A single invoice can therefore carry both a CIS deduction line and a reverse charge VAT statement, which is why the two rules are so easily conflated [3]. The deduction itself is then reported to HMRC through the contractor's monthly CIS returns, which run on their own separate deadline.
The VAT return boxes
The reverse charge splits the VAT reporting between supplier and customer. The table below shows where each party records the transaction on the VAT return.
| Party | Box 1 (output VAT) | Box 4 (input VAT) | Box 6 (sales) | Box 7 (purchases) |
|---|---|---|---|---|
| Supplier | No output VAT entered | Not affected | Net value of the sale | Not affected |
| Customer | Output VAT on the purchase | Input VAT reclaimed (subject to normal rules) | Not affected | Net value of the purchase |
The supplier must not enter any output tax in box 1 for reverse charge sales, but does enter the net value of those sales in box 6 [2]. The customer enters the output VAT it must account for in box 1, then reclaims the same VAT as input tax in box 4 to the extent it is entitled to recover it, so for a fully taxable business the two entries net to nil [2]. This self-cancelling entry is why the reverse charge is sometimes called notional VAT.
The cash flow effect on subcontractors
The reverse charge has a direct effect on subcontractor cash flow, and it is the change most subcontractors feel first. Before the charge, a subcontractor collected VAT from its customer and held that cash until the VAT was due to HMRC, giving it a temporary working capital benefit [9]. Under the reverse charge the subcontractor no longer receives that VAT at all, so the gross value of incoming payments falls [1].
Many subcontractors also find themselves in a net repayment position, because they still pay VAT on their own purchases but no longer collect output VAT on their sales [2]. A business regularly in repayment can apply to submit monthly rather than quarterly VAT returns to recover input tax sooner and smooth its cash position [1]. Subcontractors already operating close to their margins should model the change before it bites, because the working capital effect can be larger than the CIS deduction itself. Sole traders taking on their first labour-only subcontractors can find the interaction of CIS and VAT particularly demanding, and a clear record of each payment, held in one place such as payroll software for sole traders, reduces the risk of a miscalculation.
Common errors and how to avoid them
The reverse charge generates a predictable set of mistakes, and HMRC's guidance is built around them. The most frequent is charging VAT on a supply that should carry the reverse charge, which leaves the customer paying VAT it should have self-accounted for and the supplier holding VAT it should never have collected [2]. The mirror error, applying the reverse charge to a supply to an end user who has confirmed its status, is equally common [5].
A second cluster of errors comes from status confirmation. A supplier that applies normal VAT because it assumed the customer was an end user, without holding the written confirmation, cannot support that treatment if HMRC checks [1]. Keeping the end user or intermediary statement on file is the simplest protection [2]. A third error is misreading the CIS boundary, since a payment outside CIS is also outside the reverse charge, and treating a non-CIS payment as reverse charge work misstates both invoices [3]. Businesses that report CIS and VAT through connected systems remove much of this risk, and platforms embedding UK payroll through an HMRC-recognised payroll API can align CIS reporting with the wider compliance record automatically.
Conclusion
The CIS reverse charge is best understood as a plumbing change rather than a tax change: the same VAT is due, but a different party accounts for it, and the cash that once moved between businesses no longer does. For contractors, the discipline is checking each supply against the conditions and holding the written statements that support any exemption. For subcontractors, the real work is planning around the cash flow the charge removes.
As construction supply chains grow more digital, the businesses that cope best are those whose CIS, VAT and payroll records sit together rather than in separate ledgers reconciled by hand. Aligning those records is where the reverse charge stops being a monthly puzzle and becomes a settled part of the process.
FAQs
Is the CIS reverse charge the same as a CIS deduction?
No. A CIS deduction is income tax withheld from the labour element of a subcontractor's payment and paid to HMRC by the contractor. The reverse charge is a VAT accounting rule that moves responsibility for VAT from the supplier to the customer. Both can appear on the same invoice, but they are separate obligations with separate rules, and the CIS deduction is calculated on the payment excluding VAT.
Does the reverse charge apply to zero-rated construction work?
No. The reverse charge only applies to supplies that are standard-rated or reduced-rated for VAT. Zero-rated construction, such as building a new dwelling, has no VAT to account for, so the reverse charge does not apply. A supplier working on a new build should confirm the zero-rating under VAT Notice 708 before treating the supply as outside the charge.
How does a customer confirm it is an end user?
The customer must tell its supplier in writing that it is an end user or an intermediary supplier. There is no prescribed form, but the statement should be clear and dated, and the supplier should keep it on file. Until the supplier receives that written confirmation, it should apply the reverse charge, because it cannot otherwise know how the customer will use the work.
What is the 5% rule on a mixed invoice?
Where the reverse charge element of an invoice is 5% or less of the total invoice value, the whole supply can be treated under normal VAT rules, which avoids splitting small amounts. The rule only works to absorb a small reverse charge element into a mainly normal supply, not the reverse. Businesses in a regular relationship can also agree to apply the reverse charge to all their supplies to avoid testing each invoice.
