How to Invoice as a Self-Employed Sole Trader in the UK

Sending your first invoice as a self-employed person can feel daunting, but it really doesn't need to be. Whether you're a plumber, electrician, freelancer, or any other sole trader, this guide covers everything you need to know about creating professional invoices in the UK.

Do Sole Traders Need to Send Invoices?

Yes. While there's no strict legal obligation for non-VAT-registered sole traders to issue invoices, it's strongly recommended. Invoices create a clear paper trail of your income, which you'll need when filing your Self Assessment tax return. They also make you look professional and help avoid payment disputes with clients.

If you are VAT registered, you're legally required to issue VAT invoices to other VAT-registered customers.

What to Include on a Sole Trader Invoice

Every invoice you send should include these details (see our full UK invoice checklist for more):

• Your name and business name (if you use a trading name)
• Your address and contact details
• The client's name and address
• A unique invoice number
• The invoice date
• A clear description of the work you've done or goods you've supplied
• The amount charged for each item or service
• The total amount due
• Your payment terms (when and how you want to be paid)
• Your bank details

Unlike limited companies, you don't need to include a company registration number. If you're not VAT registered, you don't need to show a VAT number either — though some sole traders add "Not VAT registered" at the bottom to avoid confusion.

Choosing an Invoice Number System

Your invoice numbers need to be unique and sequential. You can keep it simple — INV-001, INV-002, INV-003 — or use a system that includes the date or client, such as:

• INV-2602001 — the first invoice of February 2026
• SMITH-001 — first invoice for client Smith
• 001 — just a simple running number

The format doesn't matter as long as each number is unique and you can track the sequence.

Setting Payment Terms

Payment terms tell your client when and how to pay. Common options for UK sole traders include:

• Due on receipt — payment expected immediately
• 7 days — common for smaller jobs and regular clients
• 14 days — a popular middle ground
• 30 days — standard for larger commercial clients

Always agree payment terms with your client before you start the work, not after. Put it in writing — even a text or email confirmation is better than nothing.

Tip: the shorter your payment terms, the faster you generally get paid. If you're a tradesperson doing one-off jobs for homeowners, "due on receipt" or "7 days" is perfectly reasonable.

Do You Need to Charge VAT?

You only need to charge VAT if you're VAT registered with HMRC. You must register for VAT if your taxable turnover exceeds £90,000 in any 12-month period (as of 2025/26). Below that threshold, VAT registration is optional.

For more detail, see our guide on whether tradespeople need to charge VAT.

If you're VAT registered, your invoices must also include your VAT registration number, a breakdown of the VAT charged on each item, and the VAT rate applied (usually 20%).

When to Send Your Invoice

Send your invoice as soon as the work is complete — ideally the same day or the next working day. The longer you wait, the longer you wait to get paid. Some tradespeople wait weeks to invoice, which is essentially giving your clients an interest-free loan.

For larger jobs that take weeks or months, consider invoicing in stages. You might send an invoice at the end of each week, or at agreed milestones. This keeps your cash flow healthy and avoids having too much money tied up in unpaid work.

How to Send Your Invoice

Email is the standard method. Create your invoice as a PDF and attach it to an email with a brief message like:

Hi [Client],

Please find attached my invoice [number] for [brief description of work]. Payment is due by [date].

Bank details are on the invoice. Please let me know if you have any questions.

Thanks,
[Your name]

Always send invoices as PDFs — not Word documents or images. PDFs look professional, can't be accidentally edited, and open on any device.

What If a Client Doesn't Pay?

Late payments are unfortunately common for sole traders and small businesses in the UK. If a client doesn't pay on time, see our guide on how to chase late invoice payments.

Keeping Records

HMRC requires you to keep copies of all invoices you issue for at least 5 years after the 31 January submission deadline of the relevant tax year. You'll also need these records when Making Tax Digital (MTD) for Income Tax becomes mandatory for sole traders, which is being phased in from April 2026.

Keep copies digitally — either in a folder on your computer, in cloud storage, or using accounting software.

Create Your First Invoice Now

You can create a professional sole trader invoice for free using InvoiceJob. Fill in your details, add your line items, and download a PDF in under two minutes. No signup needed — and we've built it specifically for UK tradespeople, so it handles VAT, CIS, and UK formatting out of the box.