What Is a VAT Invoice? UK Guide to VAT Invoice Requirements

What Is a VAT Invoice?

A VAT invoice is a document issued by a VAT-registered business that records a taxable sale. It differs from a regular invoice because it includes specific VAT details — the supplier's VAT registration number, the applicable tax rate, and a breakdown of the net amount, VAT amount, and gross total.

The purpose of a VAT invoice is to enable the buyer to reclaim the VAT they have been charged as input tax on their VAT return. Without a valid VAT invoice, the buyer cannot make this claim.

Three Types of VAT Invoice

HMRC recognises three types of VAT invoice, each with different requirements:

1. Full VAT Invoice

Required for most B2B transactions. Must include all mandatory fields (see below). There is no upper limit on the invoice amount.

2. Simplified VAT Invoice

Can be used when the total amount including VAT is £250 or less. Requires fewer fields — useful for retail and small transactions.

3. Modified VAT Invoice

Used for retail sales over £250 where the customer is not VAT-registered. Shows VAT-inclusive prices rather than separate net and VAT amounts.

Required Fields on a Full VAT Invoice

A full VAT invoice must include the following:

1. Supplier's name and address
2. Supplier's VAT registration number
3. Invoice date (also called the tax point or date of supply)
4. Unique invoice number — sequential, with no gaps
5. Customer's name and address
6. Description of goods or services
7. Quantity of goods or extent of services
8. Unit price excluding VAT
9. Total net amount (before VAT)
10. VAT rate applied to each item
11. Total VAT amount
12. Gross total (net + VAT)

If different items on the same invoice have different VAT rates (e.g. standard rate and zero rate), you must show the net amount and VAT amount separately for each rate.

Simplified VAT Invoice Fields

For transactions totalling £250 or less (including VAT), you only need:

• Your name and address
• Your VAT registration number
• The date
• A description of the goods or services
• The total amount including VAT
• The VAT rate

You do not need to show the customer's details, the net amount, or the VAT amount separately.

When Must You Issue a VAT Invoice?

The rules depend on who your customer is:

• B2B (to another VAT-registered business) — you must issue a VAT invoice within 30 days of the supply date
• B2C (to an individual or non-VAT-registered business) — you only need to issue a VAT invoice if the customer requests one

Even if you do not have to issue a VAT invoice, you still need to record the VAT on the sale in your VAT records.

VAT Rates in the UK

There are three VAT rates in the UK:

Some supplies are exempt from VAT entirely (e.g. financial services, education, health services). Exempt supplies do not need to appear on a VAT invoice, but you should note them separately if they appear alongside taxable supplies.

Common VAT Invoice Mistakes

• Showing VAT when you are not registered — this is illegal. If you are not VAT-registered, do not include a VAT number or charge VAT.
• Wrong VAT rate — check whether your supply qualifies for the reduced or zero rate before invoicing
• Missing the tax point — the invoice date should match the date of supply. If they differ, note both dates.
• Not issuing within 30 days — late VAT invoices can trigger penalties from HMRC
• Incorrect VAT number — always verify your VAT number is correct on the invoice. A single digit error can cause problems for your customer's VAT reclaim.

Create a VAT Invoice

Our UK VAT invoice generator includes all HMRC-required fields and calculates VAT automatically at the correct rate.