In this article
Every UK invoice must contain a unique identification number, your business name, address and contact details, the customer's name and address, a description of what you are charging for, the supply date, the invoice date, the amount charged and the total owed. Sole traders and limited companies each require some more info, as do VAT invoices.
That's the legal minimum, but it isn't the same list as the one that gets your invoice paid, and this piece covers both.
The short version
- Nine fields are required on every invoice, whatever your business structure.
- Sole traders must give their own name and a service address. Limited companies must use the full name on the certificate of incorporation.
- Name one director and you must name all of them.
- A full VAT invoice carries fifteen or so further particulars, set out in regulation 14 of the VAT Regulations 1995.
- The supply date is required on every invoice, not only VAT ones, and it is not the invoice date.
- Payment method changes speed more than any field does: 72.7% of Apple Pay payments arrive on or before the due date, against 57.9% for bank transfer (Adfin platform data).
The short answer
A compliant UK invoice needs the nine fields in the next section. Anything beyond that is either a requirement of your business structure, a requirement of VAT registration, or a choice you're making about how easy your invoice is to pay.
What every UK invoice must include
GOV.UK sets out the minimum for any invoice, VAT registered or not:
- A unique identification number
- Your company name, your address and your contact information
- The company name and address of the customer you are invoicing
- A clear description of what you are charging for
- The date the goods or service were provided, known as the supply date
- The date of the invoice
- The amount or amounts being charged
- The VAT amount, if applicable
- The total amount owed
Two of these are worth pausing on.
The supply date is separate from the invoice date, and it's required on every invoice, not only on VAT ones. The two get conflated constantly. If you invoice in April for work you delivered in March, both dates belong on the document and they're different.
The unique identification number is a requirement rather than a convention. If you restart your numbering per client or per year you create duplicates across your ledger, and that matters to HMRC and matters again when somebody tries to match a payment to your invoice.
The details depending on your business structure
| If you are | You must also include |
|---|---|
| A sole trader | Your own name, any business name you trade under, and an address where legal documents can be delivered if you use a business name |
| A limited company | The full company name exactly as it appears on your certificate of incorporation |
One rule catches limited companies out. If you put any director's name on your invoices, you must include the names of all of them.
N.B. There is no obligation to name directors at all
When do you need a VAT invoice?
If you're VAT registered and your customer is too, you need a full VAT invoice. The particulars are set out in law rather than in guidance, in regulation 14 of the VAT Regulations 1995. On top of the standard fields it has to show:
- A sequential number based on one or more series which uniquely identifies the document
- The time of supply, and the date of issue
- Your name, your address and your VAT registration number
- The customer's name and address
- A description sufficient to identify what was supplied
- For each line: the quantity, the rate of VAT and the amount payable excluding VAT
- The gross total payable excluding VAT
- The rate of any cash discount
- The total VAT chargeable, in sterling
- The unit price
Where a margin scheme, the reverse charge or a free zone applies, the invoice has to say so.
You've got 30 days to issue it. A VAT invoice must be provided within 30 days of the time the supply is treated as taking place, unless HMRC has allowed longer by direction. Those 30 days run from the tax point, not from the day you get round to raising it.
There's a shorter version, though it depends on what kind of business you are and not on the size of the sale.
Under regulation 16, a retailer only has to issue a VAT invoice when a customer who is a taxable person asks for one. When one is asked for, it can be a less detailed invoice if the supply including VAT is £250 or less and the invoice includes no exempt supplies. So it's a concession for shops with tills, and a small invoice on its own doesn't qualify you for it.
So if you're not a retailer, every VAT invoice you issue is a full one, whatever it's for. A consultancy billing £200 needs the complete set of particulars.
The fields that are not required but change whether you get paid
Nothing below is a legal requirement, but each one can make it more likely that you're paid faster.
| Field | Why it earns its place |
|---|---|
| Payment terms in words | "Payment due within 14 days" is unambiguous. A due date alone leaves the terms to be inferred |
| A named contact, not a role | accounts@ is a queue. A named person is accountable |
| A way to pay on the invoice itself | A PDF is a document. A link is an action |
| The purchase order or reference the customer needs | Larger finance teams will not pay without it, and finding that out on day 30 costs a month |
| Your bank details and your VAT number together | Saves an email |
Invoice errors that delay payment
Usually it's in the small details: a missing supply date, a company name that doesn't match the certificate of incorporation, one director named and the others left off. Any of these make your invoice disputable and can make it unusable for your customer's VAT recovery, which turns a payment problem into a correspondence problem.
The commercial failures cost more, and they happen on invoices nobody is arguing about. Your invoice can carry every required field and still take 60 days, because it landed in an inbox nobody checks, or reached somebody with no authority to approve it, or asked for a bank transfer to be typed in by hand.
The timing data shows why that's expensive. Across Adfin, the median customer-initiated payment arrives 53 hours after the request, and 42.9% arrive inside 24 hours (Adfin platform data). The window is short: once somebody has actually seen your request you're usually paid inside a day or two, and after that the invoice can sit for weeks. So a week spent in the wrong inbox is a week added to the end of your cycle, not the start of it.
Common questions
What must a UK invoice legally include? A unique identification number, your business name, address and contact information, the customer's name and address, a description of what you are charging for, the supply date, the invoice date, the amounts charged, the VAT amount if applicable, and the total owed. Sole traders add their own name and a service address. Limited companies must use the full name on the certificate of incorporation.
Is the supply date the same as the invoice date? No. The supply date is when the goods or service were provided, the invoice date is when you raised the document, and both are required. They are frequently the same day and frequently not.
Do I have to put my company registration number on an invoice? Not by the invoicing rules. A limited company must use its full registered name, and company details including the registration number are required on business letters and websites, so most firms carry the number on invoices as well.
Do I need to name my directors? No, but if you name one you must name all of them.
Does an invoice have to be a PDF? No. There is no required format. What matters is that the required information is present and that you keep a copy.
Can I invoice without being VAT registered? Yes. You raise a standard invoice with the nine required fields and no VAT line. You must not charge or show VAT until you are registered.
Sources
- legislation.gov.uk — VAT Regulations 1995, regulation 14 (accurate as of August 2026)
- legislation.gov.uk — VAT Regulations 1995, regulation 16 (accurate as of August 2026)
- GOV.UK — invoices, what they must include (accurate as of August 2026)
- GOV.UK — VAT Trader Records manual, VATREC6010 (accurate as of August 2026)
- GOV.UK — VAT Trader Records manual, VATREC16042 (accurate as of August 2026)
Reviewed by the Adfin team. This article explains how invoicing works and is not tax or legal advice. Requirements are correct as of August 2026; check current HMRC guidance before relying on them. Last updated August 2026.
