How to Invoice as a Sole Trader UK: A Complete Guide

As a sole trader in the UK, sending invoices is how you get paid. But what exactly should a sole trader invoice include? What are the legal requirements? And how do you make sure clients pay on time?

This guide covers everything you need to know.

Do Sole Traders Have to Invoice?

Yes — if you're self-employed or running a business as a sole trader, you should issue invoices for any goods or services provided. An invoice is both a payment request and a legal record of the transaction.

HMRC expects you to keep records of all invoices you issue as part of your self-assessment tax obligations.

What Must a UK Sole Trader Invoice Include?

There's no single legal template for sole trader invoices, but HMRC recommends including:

1. The word "Invoice" — makes it clear this is a payment request
2. A unique invoice number — for your own records and the client's accounting
3. Your name (or trading name) and address — your legal name as a sole trader, or your business trading name
4. Your contact details — email and/or phone
5. The client's name and address — the person or business being billed
6. Invoice date — when the invoice was issued
7. Description of goods or services — what you did or supplied
8. Amount charged — per item or as a total
9. Total amount due — including any VAT if you're VAT-registered
10. Payment due date — when you expect to be paid
11. Payment details — your bank account (sort code + account number), or other payment methods

VAT on Sole Trader Invoices

If you are NOT VAT-registered (most sole traders earning under £90,000/year):

• Do not charge VAT on your invoices
• Do not include a VAT number
• Simply show the net price as the total

If you ARE VAT-registered:

• Show your VAT registration number
• Break out the net amount, VAT amount, and gross total
• Use the correct VAT rate (standard 20%, reduced 5%, or zero-rated)

Most sole traders starting out don't need to register for VAT until turnover exceeds the VAT threshold (£90,000 as of 2026).

Sole Trader Invoice vs Limited Company Invoice

The main differences:

| Feature | Sole Trader | Limited Company | |---------|-------------|-----------------| | Name on invoice | Your personal name (or trading name) | Company registered name | | Company number | Not required | Must include registered company number | | Registered address | Not required | Must include registered office address | | Legal liability | Personal | Company (separate legal entity) |

As a sole trader, you trade under your own name unless you've registered a trading name with HMRC.

Invoice Numbering for Sole Traders

Your invoice numbers should be:

• Unique — no two invoices should share the same number
• Sequential — makes it easy to track what's been sent
• Simple — e.g. INV-001, INV-002, or 2026-001, 2026-002

You can start at any number — there's no legal requirement to begin at 001. Using the year (e.g. 2026-001) helps organise records year by year.

Payment Terms for Sole Traders

Common options:

• Due on receipt — immediate payment
• Net 7 — within 7 days
• Net 14 — within 14 days (recommended for most freelancers)
• Net 30 — within 30 days (standard for corporate clients)

The default under UK law (Late Payment of Commercial Debts Act 1998) is 30 days if no terms are agreed. Specifying shorter terms puts you in control.

How to Chase Late Payments as a Sole Trader

1. Send a polite reminder 1–2 days after the due date
2. Follow up by phone if email goes unanswered
3. Send a formal overdue notice referencing the invoice number and amount
4. Charge statutory interest — you're legally entitled to 8% above the Bank of England base rate
5. Use a debt recovery service or small claims court for persistent non-payers

For detailed guidance, see our guide: How to Chase an Invoice in the UK

Keeping Invoice Records

As a sole trader, HMRC requires you to keep records of:

• All invoices issued
• All business expenses
• Bank statements

You must keep these records for at least 5 years after the Self Assessment deadline for that tax year.

How to Create a Sole Trader Invoice

You can create a professional invoice quickly with Billdrop:

1. Go to billdrop.app
2. Fill in your details and your client's details
3. Add your line items
4. Choose a template (Classic, Modern, or Minimal)
5. Download as PDF — no account needed

Billdrop auto-increments your invoice numbers, handles VAT calculations, and lets you save your details as a draft for next time.

Summary

As a sole trader in the UK, a valid invoice should include your name, the client's name, a unique invoice number, the date, a clear description of work, the amount, and your payment details. Keep VAT off your invoices unless you're VAT-registered, and always state your payment terms clearly.

Billdrop is a free invoice generator built for UK freelancers and sole traders. Create and download invoices in seconds — no sign-up required.