HMRC Invoice Requirements for UK Contractors: What Every Invoice Must Show

For VAT-registered contractors, issuing a compliant VAT invoice is not just a courtesy — it is a legal obligation. Your client's ability to reclaim the VAT you charged as input tax depends entirely on them holding a valid VAT invoice that meets HMRC's requirements. An invoice that is missing the supplier's VAT number, fails to show the VAT amount separately, or uses an incorrect date can be rejected by HMRC when the client comes to reclaim the VAT, creating a problem that comes back to you in the form of an unhappy client and potentially a HMRC enquiry into your own VAT accounting.

The Nine Mandatory Fields on a Full VAT Invoice

HMRC's VAT regulations specify nine pieces of information that must appear on a full VAT invoice. First, the name and address of the supplier — that is, the trading name and principal place of business of the business that made the supply. Second, the supplier's VAT registration number in the format GB followed by nine digits. Third, the invoice date, which must be the date the invoice is issued and which HMRC uses to determine the tax point — the date on which VAT becomes due. Fourth, a unique sequential invoice number that allows the invoice to be identified within the supplier's records. Fifth, the customer's name and address, identifying the recipient of the supply. Sixth, a description of the goods or services supplied sufficient to identify the nature of the supply. Seventh, the quantity of each description of goods supplied or the nature and extent of each service provided. Eighth, the unit price and the rate of VAT applicable to each item, along with the net value of the supply at each rate. Ninth, the total amount of VAT charged.

The Tax Point and Why It Matters

The tax point — sometimes called the time of supply — determines when VAT must be accounted for in your VAT return. For services, the basic tax point is when the service is performed. For goods, it is when the goods are removed or made available to the customer. However, the actual tax point can be moved by the issue of a VAT invoice or receipt of payment: if you issue a VAT invoice within fourteen days of the basic tax point, the invoice date becomes the actual tax point. If your client pays a deposit before the work is done, VAT is due on the deposit at the time of payment. For construction contractors with large projects spanning multiple VAT periods, the interaction between the basic tax point, invoice date, and payment receipt can have a material effect on which VAT return period a supply falls into, and getting it wrong can mean that VAT is declared late, attracting default surcharges.

Simplified Invoices for Supplies Under £250

For supplies whose total value (including VAT) does not exceed £250, HMRC permits the use of a simplified VAT invoice — sometimes called a less detailed tax invoice. A simplified invoice need only show the supplier's name and address, the supplier's VAT registration number, the invoice date, a description of the goods or services, and the total amount payable including VAT. It does not need to show the customer's name and address, the VAT amount separately, or the VAT rate, though many contractors include these details anyway for clarity. Simplified invoices are commonly used for till receipts, tradesperson invoices for small domestic repairs, and other high-volume low-value transactions where a full VAT invoice would be disproportionate. A customer can reclaim the VAT on a simplified invoice even without seeing the VAT amount broken out, provided the invoice is otherwise compliant.

Self-Billing Arrangements

In the construction sector, it is common for main contractors to operate self-billing arrangements with subcontractors, particularly under CIS. Under a self-billing arrangement, the main contractor (the customer) raises the invoice on behalf of the subcontractor and provides it to them with a copy for the subcontractor's records. This is a HMRC-approved arrangement but requires a formal written agreement between the parties specifying that the customer will raise the self-billed invoices, the supplier will not raise sales invoices for the same supplies, and the arrangement will be reviewed at least every twelve months. The self-billed invoice must show the subcontractor's name and VAT number, and must comply with all the usual VAT invoice requirements. Main contractors who operate self-billing but fail to have the required written agreement in place risk HMRC challenging the VAT invoices and potentially disallowing input VAT claims.

Invoices in Foreign Currency

For most UK contractors all invoices are in pounds sterling, but for those working on cross-border projects or invoicing international clients, invoices in foreign currency are permissible provided that the VAT amount is also shown in sterling. If the invoice is in US dollars or euros, the VAT must be converted to sterling at the relevant exchange rate and the sterling VAT amount shown clearly. The exchange rate used should be the Bank of England rate or, for businesses that use a different rate consistently, that rate — provided it is a consistent policy. The sterling VAT amount shown on the invoice is what the supplier accounts for in their VAT return, regardless of the exchange rate movements that may subsequently occur.

Record-Keeping Requirements

HMRC requires VAT-registered businesses to keep records of all VAT invoices issued and received for at least six years. For construction contractors, this interacts with the longer liability periods under the Building Safety Act and the Defective Premises Act, which effectively means invoice records for residential work should be kept for considerably longer. Records must be kept in a form that allows HMRC to verify the VAT declared on returns, and HMRC has the power to inspect records during a VAT visit or investigation. Digital records kept in a software platform are generally acceptable, provided they are accessible, legible, and cannot be altered without leaving a trace. Making Tax Digital for VAT already requires most VAT-registered businesses to keep digital VAT records and submit VAT returns using compatible software, so paper invoice records alone are no longer sufficient for VAT purposes.

How QuotCraft Ensures Invoice Compliance

QuotCraft generates VAT invoices that include all nine mandatory fields as a matter of course, drawing the supplier's VAT number, business name, and registered address from your account profile. The sequential invoice numbering system ensures that every invoice has a unique identifier, and the platform prevents gaps or duplicates in the number sequence. The tax point date is set to the invoice issue date by default, with the option to set a different tax point where the rules require it, such as for payments received in advance. For contractors who use the Domestic Reverse Charge, QuotCraft formats the invoice correctly by suppressing the output VAT charge and inserting the mandatory DRC statement. All issued invoices are archived in your QuotCraft account with a tamper-evident record, satisfying HMRC's digital record-keeping requirements and providing the audit trail necessary for both VAT compliance and the longer record-keeping obligations that apply to residential construction work.