What to put on a UK VAT invoice (and when a simplified one is fine)

Once you're VAT registered in the UK, every invoice you send becomes a tax document as well as a request for money. HMRC is fairly specific about what has to be on it — and less well known is that it also allows two shortcuts, the simplified invoice and the modified invoice, for the situations where the full version is overkill. Knowing which one actually applies to you saves you adding detail nobody asked for, or worse, leaving off something a client's accounts team is waiting for before they'll pay.

This is written specifically for VAT-registered small businesses. If you're not sure whether you need to register at all, our guide on UK invoice requirements covers the threshold and what a non-VAT invoice needs instead.

The default: a full VAT invoice

Unless one of the exceptions below applies, HMRC expects a "full" VAT invoice to include:

Your business name, address and VAT registration number.
A unique, sequential invoice number — never reused, never skipped.
The invoice date, and the tax point (the "time of supply"), which is usually the invoice date but can differ if goods or services were actually delivered on a different date.
The client's name and address.
A description of each item supplied, with the quantity and the unit price, excluding VAT.
The rate of any discount, if one applies.
The VAT rate charged on each item, shown separately where rates differ — most things are standard-rated at 20%, but some are reduced-rate, zero-rated or exempt, so check which applies to what you sell if you're not certain.
The total excluding VAT, the total VAT charged, and the total including VAT.

As a rule of thumb, if your invoice mixes items at different VAT rates, each rate needs to be broken out rather than folded into one blended figure. That's the detail that's easiest to get wrong doing it by hand in a spreadsheet, and the detail an accounts team is most likely to query.

When a simplified VAT invoice is enough

For retail-style supplies of £250 or less including VAT, HMRC allows a simplified VAT invoice instead, which only needs:

Your business name, address and VAT number.
The date of supply.
A description of the goods or services.
The VAT rate charged on each item.
The total price including VAT.

Notice what's missing: no invoice number is required, no client details, and no VAT amount shown separately from the total — just the rate. This mostly suits businesses selling in person or handling lots of small transactions (think a café, a market stall, or a tradesperson doing small call-out jobs). If most of your work is invoicing other businesses for larger amounts, you'll likely end up using the full format anyway, since clients generally expect the fuller breakdown regardless of whether the £250 threshold technically allows less.

When a modified VAT invoice applies

Less commonly used, a modified VAT invoice is for retail supplies over £250, and it's essentially the full invoice with one change: the total can be shown as VAT-inclusive rather than broken out line by line, as long as the VAT rate and the total VAT charged are both still shown. This exists mainly for retailers with till systems built around VAT-inclusive pricing — most service-based small businesses will never need it, but it's worth knowing it exists rather than assuming a £250+ sale automatically requires the fully broken-out version.

A quick way to decide which one you need

Selling to another business, invoicing for services, or the sale is over £250? Use the full VAT invoice.
A small retail-style sale of £250 or less, and you want to keep the paperwork minimal? A simplified invoice is allowed.
A retail sale over £250 where your pricing and till system work in VAT-inclusive totals? A modified invoice can work, provided the rate and VAT total are still shown.

When in doubt, the full invoice is never wrong — it's always acceptable even when a shortcut would technically do, which is exactly why most invoicing software defaults to it.

Mistakes that hold up payment either way

Charging VAT without your VAT number on the invoice. Some accounts systems will bounce it automatically.
A blended VAT figure on a full invoice with mixed rates, instead of each rate shown separately.
A tax point that doesn't match when the work was actually delivered — this matters more than it looks, since it determines which VAT return period the sale falls into.
Treating a simplified invoice as an excuse to skip invoice numbering altogether in your own records, even though HMRC doesn't require a number on that particular document. Your own bookkeeping still needs a trail.
Using a simplified or modified invoice out of habit for a B2B sale well over £250, where the client's finance team is expecting the full breakdown and will ask you to resend it.

Record keeping

HMRC generally expects VAT records — including copies of every invoice issued and received — to be kept for six years. If you're VAT registered, you're also likely required to keep digital records and file VAT returns through compatible software under Making Tax Digital rules, so it's worth double-checking your current setup actually qualifies rather than assuming a plain spreadsheet still does. Your accountant is the right person to confirm exactly what applies to your business.

Making this automatic

Working out which invoice format applies, then getting the rate breakdown and tax point right every time, is easy to get subtly wrong doing it by hand. InvoiceCharlie builds correctly formatted full VAT invoices automatically, with rate breakdowns and sequential numbering handled for you, so you're not reconstructing the rules from memory on every job.

If you just need one invoice right now, the free invoice generator will build a VAT-ready invoice with no account needed. For ongoing invoicing with numbering, reminders and online payment sorted automatically, your first 10 invoices are free, then never more than $12/month — and if you're also chasing payment on an existing invoice, our guide on getting invoices paid faster covers the habits that actually move the needle.