How to invoice as a sole trader: what every invoice must include
A sole trader invoice does not need to look complicated, but it does need to be clear. A good invoice tells the customer who you are, what you supplied, what they owe, when to pay, and how to pay.
What a sole trader invoice should include
- A unique invoice number.
- Your business name or your own name if you trade under your personal name.
- Your business address and contact details.
- The customer's name and address.
- The invoice date.
- A clear description of the goods or services supplied.
- The date the goods or services were supplied, if different from the invoice date.
- The amount charged and payment terms.
Invoice numbering
Invoice numbers should be unique and sequential enough that you can explain the record later. They do not need to start at 1. Many sole traders use a format like 2025-001, 2025-002, and so on. Avoid reusing numbers or creating gaps without a note.
Payment terms
State when payment is due, for example 7 days, 14 days, or 30 days from the invoice date. Include bank details or a payment link. If you charge late payment interest or recovery costs, make sure your contracts and invoice wording are consistent with the rules.
Late payment rules
UK late payment legislation can let businesses claim statutory interest and fixed recovery costs on qualifying late commercial debts. In practice, many sole traders start with a polite reminder and then escalate. Clear invoice dates and terms make this easier.
VAT invoices
If you are not VAT registered, do not add VAT to your invoices. If you are VAT registered, your invoices need extra VAT information, including your VAT registration number, VAT rate, VAT amount, and totals. Use the VAT add/remove calculator to check net, VAT, and gross figures before sending.
Descriptions and evidence
Write descriptions that would make sense months later. “Consulting work” is weaker than “Website accessibility audit, phase 1, agreed 10 June 2025”. Good descriptions help with customer queries, Self Assessment records, and debt recovery.
When to issue invoices
Many sole traders invoice when work is completed, at agreed milestones, or monthly for ongoing retainers. If cash flow is tight, ask for deposits or staged payments before work starts. Your invoice timing should match your contract or written agreement.
Keep records for tax
Keep copies of invoices, credit notes, receipts, and bank payments. These records support your turnover figure, expenses, VAT position, and Self Assessment return. If you are affected by Making Tax Digital, digital record keeping becomes even more important.
Related guides
If your turnover is rising, read the £90,000 VAT registration guide. If you are preparing for digital record keeping, read Making Tax Digital for sole traders.
Official sources
GOV.UK invoice guidance is here: Invoices - what they must include. VAT invoice rules are here: VAT invoices.