How VAT Invoices Work in the UK: A Complete Guide

What Is a VAT Invoice?

A VAT invoice is a legally required document that VAT-registered businesses must issue when they make a taxable supply of goods or services to another VAT-registered business, or when requested by any customer. It differs from a regular invoice in that it must include your VAT registration number, a breakdown of VAT charged, and specific date and identification information.

When your VAT-registered client receives a valid VAT invoice from you, they can use it to reclaim the VAT they paid as input tax — reducing their own VAT bill. This is why the format and content of a VAT invoice matter so much: an invalid invoice means your client can't reclaim their VAT, which they won't thank you for.

Who Needs to Issue VAT Invoices?

You must issue a VAT invoice if you are VAT-registered and make a supply to another VAT-registered business. The obligation applies from the date you became VAT-registered, not from when you expected to be registered.

You do not need to issue a VAT invoice to non-VAT-registered customers (e.g. private individuals) unless they specifically request one, though you must still account for the VAT in your returns.

VAT Registration Threshold

As of 2024, you must register for VAT in the UK when your taxable turnover exceeds £90,000 in any rolling 12-month period. Once registered, you must issue VAT invoices for all taxable supplies. You can also register voluntarily below this threshold — which allows you to reclaim VAT on business purchases, potentially beneficial if your costs are high.

What Must a UK VAT Invoice Include?

HMRC sets out the required content of a valid VAT invoice. A full VAT invoice must contain:

• A unique, sequential invoice number that forms part of a series
• Your VAT registration number (format: GB followed by 9 digits, e.g. GB123456789)
• Your business name and address
• Your customer's name and address
• The invoice date
• The tax point (also called "time of supply") — usually the date of delivery or payment
• A description of the goods or services supplied
• The quantity of goods or extent of services
• The unit price (excluding VAT)
• Any applicable discount
• The total amount payable, excluding VAT
• The rate(s) of VAT applicable
• The total VAT charged
• The total amount payable including VAT

Types of VAT Invoice

HMRC recognises three types of VAT invoice:

Full VAT Invoice

Required for all standard VAT-taxable supplies to other businesses. Contains all the mandatory fields listed above. This is the most common type used in B2B transactions.

Simplified VAT Invoice

Can be used when the supply is under £250 (including VAT). Does not need to show the customer's name and address or the net amount before VAT. Common in retail. Does not need a sequential number.

Modified VAT Invoice

Can be used for retail supplies where you want to show VAT-inclusive prices throughout. Must show the total including VAT rather than excluding VAT, but still requires your VAT number and all other mandatory fields.

UK VAT Rates

There are three VAT rates in the UK:

• Standard rate: 20% — applies to most goods and services
• Reduced rate: 5% — applies to domestic energy, children's car seats, mobility aids, and certain other specified items
• Zero rate: 0% — applies to most food, children's clothing, books, newspapers, and passenger transport, among others. Zero-rated supplies are technically taxable, so you still need to report them on your VAT return — they just carry a 0% rate

Exempt supplies (such as insurance, education, and financial services) are different from zero-rated — they are outside the VAT system entirely. If you supply only exempt goods or services, you cannot register for VAT.

The Tax Point: When Does VAT Apply?

The tax point is the date when a supply is treated as taking place for VAT purposes. It determines which VAT period a transaction falls into for your VAT return.

• Basic tax point: The date goods are delivered or services are completed.
• Actual tax point: Can be earlier if a payment is received or a VAT invoice is issued before the basic tax point. Can be later (up to 14 days after delivery) if you issue a VAT invoice within 14 days of the basic tax point.

For most service businesses, the tax point is when you raise the invoice, as long as you do so within 14 days of completing the work.

VAT on International Invoices

VAT rules get more complex when invoicing overseas clients. Key principles:

• Exports (goods): Generally zero-rated if the goods are exported outside the UK.
• Services to overseas businesses: Usually zero-rated under the "place of supply" rules — the UK supplier charges no VAT and the overseas business accounts for VAT in their own country.
• Services to overseas consumers: More complex — may still require UK VAT to be charged depending on the nature of the service.

If you regularly invoice international clients, consult an accountant or HMRC's published guidance. See also our guide on how to invoice international clients for practical considerations.

Keeping VAT Records

VAT-registered businesses must keep all VAT records (including copies of all VAT invoices issued and received) for at least 6 years. HMRC can inspect your records during a VAT inspection, so organised and complete records are essential.

Under Making Tax Digital (MTD) for VAT, businesses above the VAT threshold must keep digital records and submit VAT returns using compatible software. MTD has been mandatory for all VAT-registered businesses since April 2022.

Common VAT Invoice Mistakes

• Missing VAT number — the single most common error; makes the invoice invalid for VAT reclaim purposes
• Wrong VAT rate applied — especially on mixed-rate supplies; always verify the correct rate for each line item
• Tax point missing or incorrect — can cause issues with VAT period allocation
• Non-sequential invoice numbers — gaps in your invoice sequence can raise red flags in an HMRC inspection
• Charging VAT on exempt or zero-rated items — charging 20% VAT on a zero-rated service means you've overcollected and must pay it to HMRC

Summary

VAT invoices in the UK must meet specific legal requirements set by HMRC. The key additions to a standard invoice are your VAT registration number, the tax point, the VAT rate and amount, and a total both including and excluding VAT. You must issue VAT invoices if you're registered and supplying to other VAT-registered businesses. Maintain digital records for at least 6 years and comply with Making Tax Digital requirements. When in doubt about a specific supply, check HMRC's guidance or consult a tax professional.