A sole trader invoice should include your business details, your customer's details, a unique invoice number, the work completed, the amount due, VAT if relevant, payment terms, and your bank details.
What to include on your invoice
Keep the invoice clear enough that the customer can approve and pay it without asking extra questions.
- Your trading name, contact details, and business address.
- The customer's name, address, and email where possible.
- A unique invoice number and invoice date.
- A payment due date or clear payment term, such as 7 or 14 days.
- A plain-English description of the work, materials, call-out fees, and extras.
- Subtotal, VAT if applicable, and the final total due.
- Bank details and a payment reference instruction.
Use descriptions customers understand
Good descriptions reduce back-and-forth. "Replace kitchen tap, including fittings" is stronger than "plumbing work". "Boiler service and safety check" is stronger than "labour".
Do you need VAT on the invoice?
If your business is VAT registered, show your VAT number and make the VAT amount clear. If you are not VAT registered, do not add VAT. SayInvoice lets you save your normal VAT setting, then override it when a particular job needs different wording.
Invoice numbers and dates
Use a numbering system you can keep using. It does not need to be complicated, but every invoice should have its own number so you, your customer, and your accountant can find it later. Many sole traders use a short prefix, then a running number such as SI-001, SI-002, and SI-003.
The invoice date is the date you issue the invoice. The due date is when you expect payment. Putting both on the PDF makes the payment expectation much clearer than sending a message that simply says "please pay when you can".
Common invoice mistakes to avoid
Most invoice problems are not dramatic. They are small gaps that slow payment down because the customer is unsure what they are being charged for or how to pay.
- Using vague descriptions such as "work completed" instead of clear job lines.
- Forgetting to include bank details or a payment reference.
- Changing invoice numbers manually and accidentally creating duplicates.
- Adding VAT when you are not VAT registered.
- Sending the invoice days later, once the job details are harder to remember.
Make the invoice easy to pay
A professional invoice should remove friction. Put the total due, payment terms, bank details, and payment reference somewhere the customer can see quickly. If you work for repeat customers, keeping the wording consistent also helps them recognise your paperwork and pay faster.
Example voice note for a sole trader invoice
That kind of note gives the app enough structure to create a useful draft. You can still edit the wording, change the price, add VAT if needed, and check the customer details before sending.
Frequently asked questions
Can a sole trader send invoices without a company number?
Yes. A sole trader does not have a limited company number. Use your trading name or your own name, your business contact details, and clear payment information.
Should I include my home address?
Your invoice should include business contact details. If you are unsure what address to use, check with your accountant so your paperwork matches how your business is set up.
Can I send invoices by WhatsApp?
Yes, if the customer is happy to receive it that way. A PDF is better than a plain message because it looks more professional and is easier to save, forward, and match to payment.
How SayInvoice makes this faster
Save your business details, bank details, payment terms, invoice prefix, and VAT preference once. After that, speak the job into your phone, check the draft, and send a clean PDF by WhatsApp or email.