How to Invoice as a Sole Trader in the UK (2026 Guide)

To invoice as a sole trader in the UK, you create a document that shows your name and any trading name, your address and contact details, the client's name and address, a unique sequential invoice number, the invoice date, a clear description of what you supplied, and the total amount due. You only charge VAT if you are VAT-registered. That is the whole job in one sentence, but the details around VAT, HMRC record-keeping, and getting paid on time are where most sole traders trip up. This guide walks through all of it in plain UK English so your invoices are compliant and you actually get paid.

If you would rather skip the formatting headache, you can create a UK invoice free in 60 seconds with our free UK invoice generator — no signup, and every required field is already laid out for you.

What a UK sole trader invoice must include

There is no single government-issued invoice template, but HMRC and standard UK business practice expect every invoice to carry a specific set of details. Leave one out and a client may have a legitimate reason to delay payment, or you may struggle to evidence the income later. A compliant sole trader invoice includes:

• Your name and any trading name — your own legal name as the sole trader, plus a business or trading name if you use one (for example, "Jane Smith trading as Smith Design").
• Your address and contact details — a business or correspondence address and a way to reach you, such as an email or phone number.
• The client's name and address — the individual or company you are billing.
• A unique, sequential invoice number — each invoice needs its own number that follows on from the last (such as 0001, 0002, 0003). Sequential numbering is what keeps your records auditable.
• The invoice date and the supply (tax) date — the date you issue the invoice and the date the goods or services were supplied. They are often the same, but not always.
• A clear description of the goods or services — enough detail that the client knows exactly what they are paying for.
• The amount(s) and the total due — the price per line where relevant, and the final total the client owes.

The word "invoice" should appear clearly on the document, and it is good practice to add your payment terms and bank details so the client can pay without chasing you for them.

VAT: do you need to charge it?

This is the single biggest point of confusion for sole traders, so let us be precise.

If you are NOT VAT-registered

Most new and smaller sole traders are not VAT-registered, and that is completely fine. If you are not registered, you do not charge VAT and you do not show a VAT number on your invoice. Adding a VAT line or a VAT number you do not have is a serious error — never put VAT on an invoice unless you are genuinely registered. Your invoice simply shows the amount for your work and the total due.

The £90,000 VAT registration threshold

You must register for VAT once your taxable turnover exceeds the £90,000 threshold measured on a rolling 12-month basis. This is not your tax-year total — it is the running total of the previous 12 months, checked at the end of every calendar month. The threshold remains at £90,000 for 2026. If your rolling 12-month turnover goes over £90,000, you must notify HMRC within 30 days of the end of the month in which you crossed it. You must also register if you expect to exceed £90,000 in the next 30 days alone.

Tip: keep an eye on your rolling 12-month turnover every month once you are growing. Crossing £90,000 without noticing can leave you owing VAT you never collected from clients.

If you ARE VAT-registered

Once you are registered, your invoices become VAT invoices and must show more detail. A VAT invoice must include:

• Your VAT registration number.
• The VAT rate applied per line — the standard rate is 20%, though some goods and services are reduced-rate, zero-rated or exempt.
• The net amount — the total before VAT.
• The VAT amount — shown as its own separate figure.
• The gross total — the net plus the VAT, which is what the client pays.

The key principle is separation: net, VAT, and gross must each appear as their own line so the client (and HMRC) can see exactly how the total was built. Here is the shape of a simple VAT invoice total:

Line	Amount
Net (subtotal before VAT)	£1,000.00
VAT at 20%	£200.00
Gross total due	£1,200.00

Whether you are registered or not, you can create your invoice free with no signup and the generator handles the maths so the net, VAT, and gross always add up.

HMRC record-keeping: how long to keep invoices

Your invoices are not just for getting paid — they are evidence for your Self Assessment tax return. HMRC requires sole traders to keep their business records, including copies of invoices issued and received, for at least five years after the 31 January Self Assessment submission deadline of the relevant tax year.

In practice that means: if you file your 2024–25 return by 31 January 2026, you must keep the supporting records until at least the end of January 2031. If you file late — more than four years after the deadline — different rules apply and you may need to keep records longer. Keeping clean, sequentially numbered invoices makes this painless. If HMRC ever queries your figures, you can produce the exact invoice behind any number on your return.

Payment terms and getting paid on time

A compliant invoice is only half the battle. The other half is cash actually landing in your account. Slow payment is one of the biggest pressures on UK sole traders, and most of it is preventable with a few habits.

Set clear payment terms

State your terms on every invoice so there is no ambiguity. Common options include:

• Due on receipt — payment expected immediately.
• Net 7, Net 14 or Net 30 — payment due within 7, 14, or 30 days of the invoice date.

If you do not agree a term in advance, the law provides a default — but it is always better to state your own terms up front so the client knows the deadline before the work starts.

Charge late-payment interest when you need to

When a business client pays late, you have a statutory right to charge interest on overdue commercial invoices, plus a fixed sum to cover recovery costs. You do not have to use it on every late payment, but mentioning your right to statutory interest in your terms is a quiet, professional nudge that encourages clients to pay on time.

Make it easy to pay you

The faster and simpler the payment route, the sooner you get paid. Practical levers:

• Put your bank details on the invoice so a bank transfer takes seconds.
• Offer card or digital payment via services such as Stripe, GoCardless, or PayPal for clients who prefer them.
• Invoice promptly — send the invoice the moment the work is done, not weeks later. The clock to payment only starts when the invoice arrives.
• Send polite reminders — a short, friendly reminder a day or two after the due date recovers most late invoices without any awkwardness.

A quick step-by-step

1. Open the free UK invoice generator and add your name and trading name.
2. Add your address and contact details, then the client's name and address.
3. Give the invoice a unique sequential number and set the invoice and supply dates.
4. Describe the goods or services and enter the amount per line.
5. If you are VAT-registered, add your VAT number and the 20% rate so net, VAT, and gross show separately. If you are not registered, leave VAT off entirely.
6. Add your payment terms and bank details, then download and send it.
7. Save a copy for your records and keep it for at least five years.

That is everything a UK sole trader invoice needs. When you are ready, create a UK invoice free in 60 seconds — no signup required, and keep more guides like this handy on the InvoiceSonic blog.

Frequently asked questions

Do I need to put a VAT number on my invoice as a sole trader?

Only if you are VAT-registered. If your taxable turnover is below the £90,000 threshold and you have not voluntarily registered, you must not show a VAT number or charge VAT. Once you are registered, your VAT number is required on every invoice.

What is the UK VAT registration threshold in 2026?

The VAT registration threshold is £90,000 of taxable turnover measured on a rolling 12-month basis, and it remains at £90,000 for 2026. You must notify HMRC within 30 days of the end of the month in which you exceed it, or sooner if you expect to exceed it within the next 30 days.

How long do I have to keep my invoices?

HMRC requires sole traders to keep business records, including invoices, for at least five years after the 31 January Self Assessment deadline for the relevant tax year. Some records, such as those for capital assets, may need to be kept longer.

Do I need to number my invoices?

Yes. Each invoice needs a unique number that runs in sequence (0001, 0002, 0003, and so on). Sequential numbering keeps your records auditable and makes it easy to match any figure on your tax return back to the original invoice.

What should I do if a client pays late?

Send a polite reminder shortly after the due date — that recovers most late invoices. For overdue commercial invoices you also have a statutory right to charge interest plus a fixed recovery sum, which is worth referencing in your payment terms to encourage prompt payment.