How to Write a Valid VAT Invoice (And What HMRC Requires)
Once you are VAT registered, most sales to other VAT-registered businesses need a proper VAT invoice — and getting the format wrong is not just a paperwork nicety. An invoice missing required details can stop your customer reclaiming the VAT you charged them, which quickly becomes a relationship problem as well as a compliance one.
What a full VAT invoice must include
- A unique, sequential invoice number.
- The date of issue and the date of supply (the tax point), if different.
- Your business name, address and VAT registration number.
- Your customer's name and address.
- A description of the goods or services supplied.
- The quantity and rate for each item, the VAT rate applied, and the total excluding VAT for each rate.
- The total VAT charged and the total amount payable including VAT.
- Any discount offered, if applicable.
Simplified invoices for smaller retail sales
For retail supplies of £250 or less including VAT, a simplified invoice is usually acceptable, needing fewer details — broadly your details, the date, a description of the goods, and the VAT rate and amount, without needing the full customer details a larger invoice requires.
When you do not need to issue a VAT invoice
You generally do not need to issue a VAT invoice for sales that are entirely exempt or zero-rated, or for retail sales to a customer who has not asked for one. If a VAT-registered customer requests an invoice, however, you should provide one even for a small sale.
Multiple VAT rates on one invoice
If a single invoice covers goods or services at different VAT rates — say some standard-rated and some zero-rated items — the invoice must show each rate's net total and VAT amount separately, not just a single blended figure. This is one of the more common errors on invoices from businesses selling a mixed range of products.
Keeping records
VAT invoices you issue and receive must generally be kept for at least six years, and under Making Tax Digital they need to be reflected in digital records that feed your VAT return, not just filed away as paper copies.
Practical next steps
- Check your invoice template includes every required element before your next VAT-registered sale.
- Use sequential invoice numbering with no gaps, even across different customers.
- Apply the simplified invoice rules correctly for retail sales under £250 rather than over-complicating small transactions.
- Store issued and received VAT invoices for the required retention period, in a format you can retrieve if HMRC asks.
