If you're self-employed as a sole trader, the invoice is the document that gets you paid and keeps your records straight for Self Assessment. There's no special template you're forced to use, but there are details HMRC expects to see, and a few habits that make the difference between getting paid in a week and chasing for two months. Here's exactly how to invoice as a sole trader in the UK.
What must a sole trader put on an invoice?
Every sole trader invoice must show a clear set of details so the customer knows who's billing them, for what, and how much. If you're not VAT registered, GOV.UK's invoicing guidance requires the following:
| Detail | What to include |
|---|---|
| Unique invoice number | A sequential number that follows on from the last, no gaps |
| Your name | Your full legal name (e.g. Jane Smith) |
| Your trading name | Any business name you trade under, if you use one |
| Your address | A contact address where documents can be reached |
| Customer details | The customer's name and address |
| Description | A clear description of what you're charging for |
| Dates | The date the goods/services were supplied and the date the invoice is issued |
| Amount due | The total the customer owes |
The point that trips up new sole traders is the name. As a sole trader you and the business are legally the same person, so your own name has to appear even if you trade under something catchier. If you set up as "Bright Sparks Electrical", the invoice should show "Jane Smith trading as Bright Sparks Electrical" or "Jane Smith" alongside the business name. You can read the full rules on setting up as a sole trader on GOV.UK.
Do I need to charge VAT as a sole trader?
Only if you're VAT registered. You must register for VAT once your taxable turnover passes £90,000 in any rolling 12-month period, or if you expect to cross it in the next 30 days. Below that you can register voluntarily, but most small sole traders don't. The current rules are on GOV.UK's VAT registration page.
If you're not registered, you simply don't add VAT and you don't show a VAT number. If you are registered, your invoice becomes a full VAT invoice and needs extra lines: your VAT number, the VAT rate per item, the total excluding VAT, the total VAT, and the total including VAT. The detail on what a VAT invoice must include is on GOV.UK, and we cover the practical side in do I need to charge VAT in the UK?. If you handle VAT regularly, our UK VAT features keep the rates and totals correct automatically.
A quick note on terms people mix up: a proforma is a "this is what it'll cost" estimate, not a demand for payment, and no VAT is reclaimable from it. An invoice is the actual request for payment. A receipt proves the customer has paid. If you ever need all three, see proforma vs invoice vs receipt.
How should I number my invoices?
Number them in a single unbroken sequence so each invoice is unique and traceable. HMRC wants sequential numbers with no gaps. The simplest approach is a running count: 0001, 0002, 0003. Many sole traders prefer a prefix that makes the numbers readable at a glance, for example:
INV-2026-001,INV-2026-002(year plus counter)JS-0001,JS-0002(initials plus counter)2026-04-001(year, month, counter)
What matters is consistency. Don't restart the count when you feel like it, don't skip numbers, and don't reuse one. If you cancel an invoice, keep the number on record and issue a credit note rather than deleting it. A tidy numbering scheme also makes your year-end Self Assessment far easier because you can see at a glance that nothing is missing. Invoify's invoice numbering handles the format and auto-increment for you so you never end up with a duplicate or a gap.
Setting payment terms and getting paid
State your payment terms clearly on every invoice. There's no legal default you have to use, but you need to tell the customer how long they have. Common terms are:
| Term | Meaning |
|---|---|
| Due on receipt | Pay immediately |
| Net 7 / Net 14 | Pay within 7 or 14 days |
| Net 30 | Pay within 30 days (common for B2B) |
Spell out the date money is due, not just "30 days", and include how to pay: your bank name, sort code, account number, and a reference (usually the invoice number). The clearer this is, the fewer excuses a slow payer has.
If a business customer pays late, you have a statutory right to charge interest under the Late Payment of Commercial Debts (Interest) Act 1998. Statutory interest is the Bank of England base rate plus 8%, and you can add a fixed compensation amount per invoice:
| Debt size | Fixed compensation |
|---|---|
| Under £1,000 | £40 |
| £1,000 to £9,999.99 | £70 |
| £10,000 or more | £100 |
The base rate used is the one in force on 30 June (for debts due July–December) or 31 December (for debts due January–June), so check the live Bank of England base rate before you calculate. We walk through the maths in how to calculate late payment interest in the UK, and Invoify's late payment interest tool works it out for you. This statutory right applies to B2B debts; consumer customers are treated differently.
A worked example
Here's how it fits together. Say you're Jane Smith, a self-employed graphic designer trading as "Bright Sparks Design", not VAT registered. You've just finished a logo project for a local café.
| Field | Value |
|---|---|
| Invoice number | INV-2026-014 |
| From | Jane Smith t/a Bright Sparks Design, 12 Mill Lane, Leeds LS1 4AB |
| To | The Corner Café Ltd, 8 High Street, Leeds LS2 7HK |
| Date supplied | 2 June 2026 |
| Date issued | 5 June 2026 |
| Description | Logo design and brand guidelines |
| Amount | £650.00 |
| Payment terms | Net 14 — due by 19 June 2026 |
| Pay to | Bank: Example Bank, Sort code: 00-00-00, Account: 12345678, Ref: INV-2026-014 |
That's a complete, compliant non-VAT invoice. No VAT line, because Jane isn't registered. If she were, she'd add her VAT number and the VAT breakdown described above. Need a starting point? Grab a free HMRC-compliant UK invoice template and adapt it.
Tips to get paid faster
The mechanics of an invoice are only half the job. Getting the cash in is the other half, and a few habits make a real difference:
- Invoice the same day. The payment clock only starts once the invoice lands. Don't let invoices pile up to the end of the month.
- Keep terms short and explicit. "Due by 19 June 2026" beats "payable within a reasonable time" every time.
- Make paying effortless. Put your bank details and reference right on the invoice. Friction loses you days.
- Send polite reminders on a schedule. A nudge a day before the due date, then at +1, +7 and +14 days, gets most invoices paid without an awkward phone call.
- State your late payment policy. Mentioning that statutory interest may apply tends to move B2B invoices up the queue.
Reminders are the highest-leverage habit because they happen automatically once set up. Invoify's payment reminders send the chasers for you on whatever schedule you choose, and our guide on setting up reminders shows how to configure them.
Putting it together
Invoicing as a sole trader comes down to a handful of rules done consistently: show your legal name plus any trading name, number every invoice in one unbroken sequence, set a clear due date, only charge VAT if you're registered, and chase late payers using the rights you're owed. Get those right and your Self Assessment records take care of themselves, because every invoice is already clean and accounted for.
When you'd rather not hand-build each invoice, Invoify's invoice editor puts your name, numbering, terms and payment details in place automatically and is free to start — see what's included on the pricing page.