How to Invoice as a Sole Trader in the UK

This covers what goes on a sole trader's invoice and why, with a worked example for a trade job. If you want the wider picture of running jobs, invoices, payments and expenses day to day, see our guide to managing jobs, invoices and expenses as a sole trader. This is general guidance, not tax or legal advice, so speak to an accountant if you're unsure about your own situation.

Do you need to invoice as a sole trader?

GOV.UK's guidance on invoicingis specific about when an invoice is a legal requirement: if both you and your customer are registered for VAT, so the sale is a business to business transaction between two VAT-registered parties, you must issue a VAT invoice. Outside that situation, there's no single rule that forces you to send a formal invoice for every job.

In practice, almost every sole trader should send one anyway. You need records of all your sales and income for your Self Assessment return, and an invoice is the clearest way to show a customer what they owe, get paid on time, and prove what was agreed if there's ever a dispute. Skip it, and you'll find it harder to get paid promptly and harder to keep the records HMRC expects, even though the law doesn't force you to for most private jobs.

What a sole trader invoice must include

GOV.UK sets out what a business invoice must include: in short, who's charging whom, a clear description of the work, the relevant dates, and the amount owed. As a sole trader there's one addition to that: you need to show your own name as well as any trading name you use, and if you trade under a business name, an address where legal documents can be delivered to you, which is usually just your business address.

The worked example below shows where each of those details actually goes on a real invoice, along with a few things that aren't required by law but make a real difference to getting paid, such as a proper due date and a payment reference.

Example: a tradesperson's invoice

Here's a worked example for a made-up electrician who isn't VAT registered. The layout is simple on purpose: nothing here needs software to produce, just the details set out clearly.

Payment due within 14 days, by 28 October 2026. Please pay by bank transfer to the details below and use INV-0038 as the reference.

Dan's details show his own name as well as his trading name, in line with the sole trader rule above, and the same address doubles up as the one legal documents could be sent to. There's no VAT line because he isn't VAT registered, so he shouldn't add one or call this a VAT invoice. If he were registered, the invoice would need a VAT amount and total, covered in the VAT section below.

Numbering your invoices

Use a simple, unique sequence, such as INV-0001, INV-0002 and so on, and never reuse a number even if an invoice is cancelled. Carrying the same sequence on from one year to the next, rather than restarting at 1 every January, makes it easier to spot a gap later and matches how most invoicing software numbers things by default.

If you spot a mistake after sending an invoice, don't go back and edit the one you sent. Keep a note in your own records that it's void, and send a new invoice with the next number in the sequence, referencing the one it replaces. For a small error like a wrong quantity this is enough; if you're VAT registered and need to formally correct a VAT invoice, your accountant can advise on issuing a credit note instead.

Payment terms and late payment

You can set your own payment terms. Common choices are 7, 14 or 30 days, payment on completion, or a deposit before you order materials with the balance due on completion. Whatever you choose, put it on the invoice as an actual date rather than just a number of days, and agree it with the customer before you start the work, not after you've sent the bill.

If you haven't agreed a payment date, GOV.UK's default is that the customer should pay within 30 days of getting your invoice or receiving the work, whichever is later. If you're invoicing another business rather than a private customer, the law onlate commercial payments also gives you the right to charge statutory interest and fixed compensation on top of what you're owed.

If an invoice goes unpaid, start with a friendly reminder giving the invoice number, the amount and your bank details. If that doesn't work, a firmer written reminder setting out what happens next is the usual follow-up. GOV.UK explains thecourt process for claiming money you're owed if it comes to that, though most invoices get sorted well before it does.

If you're VAT registered

Sole traders register for VAT once their taxable turnover goes over the current threshold of £90,000 in any rolling 12-month period, or if they expect to go over it in the next 30 days. You can also register voluntarily below that threshold, which some sole traders do if most of their customers are VAT-registered businesses that can reclaim the VAT anyway.

Once registered, a full VAT invoice needs more than what's shown above. Among other things, it must show your VAT registration number, the rate of VAT applied to each item, the total amount excluding VAT, and the total VAT charged, shown in pounds sterling, though that's not the complete list. For smaller sales of £250 or less, where the customer agrees, you can issue a simplified invoice instead, showing your details, the date, a description, and the VAT-inclusive total and rate for each item, without needing to break out every figure separately.

VAT invoicing has its own detailed rules on wording, timing and record keeping, and the examples above aren't exhaustive.GOV.UK's VAT guide (Notice 700) sets out the complete current requirements, and it's worth checking with your accountant once you register, since getting a VAT invoice wrong can affect what you and your customer can both reclaim.

Common invoicing mistakes

A few things trip up most sole traders at some point. Leaving the due date off an invoice means it's never actually overdue, because nothing was agreed in the first place. Editing an invoice after it's been sent, rather than cancelling it and issuing a new one, makes your records harder to follow and looks worse if HMRC ever asks questions. Once you start trading under a business name, it's easy to forget the extra naming and address detail GOV.UK requires. And a payment reference that doesn't match the invoice number turns a five-second bank check into a guessing game.

It's also easy to let invoices pile up until the end of the month. Sending one the same day you finish a job, while the details are fresh and the customer is pleased with the work, gets you paid faster than any amount of chasing afterwards.

Paper, spreadsheet or invoicing app

A duplicate invoice book works, but you're relying on your own memory to get the numbering and the legally required details right every time, and there's no easy way to search it later. A spreadsheet template fixes the consistency problem and costs nothing, as long as you set it up properly once and don't let the formulas drift. Invoicing or job management apps build the required fields in for you, number invoices automatically, and usually send them straight to the customer by email.

Our guide to managing jobs, invoices and expenses goes into this choice in more detail, including where Making Tax Digital for Income Tax comes in if it applies to you.

Where GoWorkr fits

GoWorkr is a business admin app for UK sole traders and tradespeople, available now on the App Store. It keeps customers, jobs, invoices and payments together, so you can send a properly numbered invoice straight from a job and see what's been paid without keeping a separate spreadsheet. It's an admin app, not accounting software: GoWorkr doesn't file tax returns, doesn't submit Making Tax Digital updates to HMRC, and doesn't take card payments from your customers.

Frequently asked questions

Do I legally have to send an invoice as a sole trader?

Only in the specific case GOV.UK sets out: when both you and your customer are VAT registered. Outside that, there's no blanket legal requirement, but you still need records of your income, and an invoice is the normal way to request payment and prove what was agreed.

What happens if I don't put a due date on an invoice?

Without an agreed date, GOV.UK's default is 30 days from when the customer gets the invoice or the work, whichever is later. It's simpler, and clearer for the customer, to just put an actual date on the invoice itself.

Can I invoice without a business bank account?

Yes. Sole traders aren't legally required to have a separate business bank account, so you can invoice and get paid into a personal account. Keeping business money separate still makes your records much easier to check, and some banks don't allow business use of a personal account, so it's worth asking yours.

What if I make a mistake on an invoice I've already sent?

Don't edit it. See numbering your invoices above for how to correct it properly instead.

Do I need to put VAT on my invoices if I'm not VAT registered?

No. If you're not VAT registered, don't add a VAT line or call it a VAT invoice. You only need to show VAT once you've registered, currently required once your taxable turnover goes over £90,000 in a rolling 12-month period.