How to invoice as a freelancer in the UK: what to include and what to leave off

What a UK invoice must include

There is no official template, but gov.uk is specific about the contents. Every invoice you send needs:

• a unique invoice number
• your name or business name, address and contact details
• your client's company name and address
• a clear description of what you are charging for
• the date the work was done (the supply date)
• the date of the invoice itself
• the amounts charged, any VAT, and the total owed

Two extra rules depend on how you trade. If you are a sole trader, the invoice must show your own name as well as any business name you use, and if you do use a business name, an address where legal documents can be delivered to you. If you trade through a limited company, the full company name has to appear exactly as it does on the certificate of incorporation. You do not have to list your directors, but if you list one you have to list all of them.

That is the legal floor. You can read the source on gov.uk's invoicing guide.

What it should include as well

The legal list is what stops an invoice being rejected. These are the things that stop it sitting in someone's inbox.

• Their purchase order or reference number. Larger clients often will not pay anything without one. Ask for it when you agree the job, not when the invoice bounces.
• The name of the person who approved the work. Accounts teams pay faster when they do not have to find out who to ask.
• A due date, written as a date. "Due 6 November 2026" gets acted on. "Net 30" makes someone work it out, and they may count from the day they opened it.
• How to pay you. Bank details, a card payment link, or both. Every extra step between reading the invoice and paying it is a reason to do it tomorrow.
• Your payment terms and what happens if they are missed. One line is enough. More on that below.

Numbering your invoices

Each number must be unique and they should run in order. HMRC does not prescribe a format, so choose one that will still make sense in five years. A few that work:

• a plain sequence: 0001, 0002, 0003
• a prefix and sequence: INV-0042
• year and sequence: 2026-017

What does not work is restarting at 1 for each client, or skipping numbers when an invoice is cancelled. If you need to cancel one, issue a credit note against it rather than deleting it, so the sequence still has no gap. Gaps are what make an accountant ask questions.

Payment terms that actually get you paid

If you never agree a payment date with a business client, UK law sets one for you: the payment is late 30 days after they receive the invoice, or 30 days after you finish the work if that is later. When you do agree terms, business-to-business terms should usually be no longer than 60 days.

Thirty days is common, but nothing says you have to offer it. Plenty of freelancers use 14 days, and for small one-off jobs, payment on receipt is reasonable. The shorter your terms, the less money you are lending your clients for free.

A short, polite line at the bottom of the invoice sets expectations without sounding like a threat:

You will probably never need to enforce that line. It is there because a client who sees it tends to put your invoice in the pile that gets paid this week. If you do end up chasing, our guide to chasing an unpaid invoice takes you through it step by step.

Do you need to charge VAT?

Only if you are VAT registered. You must register once your taxable turnover goes over £90,000 in any rolling 12-month period, or if you expect it to go over £90,000 in the next 30 days on its own. That is a rolling year, not the tax year, which catches people out. The gov.uk VAT registration page has the current threshold.

If you are not registered, do not add VAT and do not write "VAT: £0.00" in a way that suggests you are. Simply leave it off.

If you are registered, your invoices become VAT invoices and need more on them: your VAT registration number, the VAT rate and amount for each line, and the total excluding VAT. Some freelancers register voluntarily below the threshold because their clients are VAT registered and can reclaim it anyway. Whether that makes sense for you is a question for an accountant, not a blog post.

Invoicing for hours, a fixed fee or a deposit

Hourly or day rate

List the dates or the tasks, the hours, the rate and the line total. Clients query hourly invoices far more than fixed ones, and the query is almost always "what was this for?" A line that says "Homepage layout revisions, round 2 - 3.5 hrs" answers it before it is asked. That only works if you log time as you go. Rebuilding a fortnight of hours from memory on invoice day tends to come out in the client's favour.

Fixed fee

One line per stage or deliverable is enough. If the quote was split into stages, mirror those stages on the invoice so the client can match one document to the other without thinking.

Deposits and stage payments

Raise the deposit as its own invoice, and show it as already paid on the final invoice so the balance is obvious. We wrote a separate guide on taking a deposit from clients, including how much is reasonable.

Expenses

If you are passing on costs, such as travel, stock photos, printing or a venue, put them on as separate lines at cost or with your agreed mark-up. Keep the receipts. A client is entitled to ask, and "I'll find it" is a bad look on a £14 train ticket.

Sending it, and keeping records

Send the invoice as a PDF or a link, never as an editable document. Send it on the day the work is delivered or the stage is signed off. Waiting until the end of the month adds a month to every payment.

Keep a copy of every invoice you issue. If you are self-employed, HMRC expects you to keep business records for at least five years after the 31 January filing deadline for that tax year. Limited companies generally need to keep records for six years.

It is also worth knowing about Making Tax Digital for Income Tax. From April 2026, sole traders and landlords with qualifying income over £50,000 must keep digital records and send HMRC quarterly updates through compatible software. The threshold drops to £30,000 from April 2027, and the government has said it will come down to £20,000 after that. Your invoicing tool does not need to be the software that files your returns, but your records need to get from one to the other without retyping. A system that exports cleanly to CSV does the job. HMRC's eligibility checker tells you whether and when it applies to you.

Templates versus invoicing software

A spreadsheet or document template is free and fine for a handful of invoices a year. It starts to cost you once you have several clients. You have to remember the next number. You have to work out what is overdue by reading a list. You have to copy hours from a separate timer by hand, and chase every late payment yourself.

Invoicing software exists to take those jobs off you. Panorivo's invoicing is one option, and it is free. A quote the client accepts becomes the invoice, so nothing is retyped. Logged hours and rebillable expenses drop onto it as line items. Your own numbering, VAT and terms are set once. The client can pay by card through your own Stripe account, by your PayPal link or by bank transfer, and overdue invoices get reminders without you deciding to send them. There are other good tools too. Whatever you use, the point is that the boring parts happen the same way every time.

If you are still on a spreadsheet and not sure it is worth moving, we wrote an honest comparison of Panorivo against a spreadsheet. For some people the spreadsheet wins.