How to Invoice as a Sole Trader in the UK 2026
Gone self-employed and not sure how invoicing works? What to include, how to number them, whether you need to charge VAT, what to do if someone doesn’t pay – this guide answers all of it in plain English, no accountant jargon.
Do Sole Traders Need to Send Invoices?
Yes – and for good reason. An invoice is your legal record that a service was provided and payment is owed. It protects you if a customer disputes a job, and it’s essential for keeping your accounts in order at tax time. HMRC requires you to keep records of all income and expenses as a sole trader. Your invoices are a core part of that.
What Must a Sole Trader Invoice Include?
- The word “Invoice” clearly at the top
- A unique invoice number – sequential, e.g. INV-001, INV-002
- The date the invoice was issued
- Your full name or business name
- Your address or contact address
- Your customer’s name and address
- A clear description of the work carried out
- The amount charged for each item or service
- The total amount due
- Your payment details – bank name, sort code, account number
- Your VAT registration number
- The VAT rate applied
- The VAT amount charged
- The total including and excluding VAT
If you’re not yet VAT registered – which most sole traders aren’t until they hit the £90,000 threshold – you don’t need to include any VAT information.
How to Number Your Invoices
Every invoice needs a unique reference number. This keeps records organised and makes it easy to track which have been paid.
Simple sequential numbering
INV-001 INV-002 INV-003
With year for extra clarity
2026-001 2026-002 2026-003
Either format works fine. The important thing is that no two invoices ever share the same number.
What Payment Terms Should You Use?
Always include your payment terms on every invoice. Without them, customers have no clear deadline and late payments become much harder to chase. Under the Late Payment of Commercial Debts Act, you’re also legally entitled to charge interest on overdue invoices from other businesses – worth mentioning in your terms.
How to Send an Invoice as a Sole Trader
Email as PDF
The most common approach. Create in Word or Google Docs, save as PDF, email directly. Clean, professional, and easy to track.
Invoicing software
Tools like Jobber let you create and send invoices from an app, track if they’ve been opened, and send automatic payment reminders.
On site from your phone
Jobber lets you invoice the moment a job is complete – from your phone before you’ve packed your tools away. Fastest route to getting paid.
By post
Rarely used but occasionally required for older customers or certain contracts. Always send recorded delivery if posting invoices.
When Should You Send Your Invoice?
The moment the job is done – send the invoice. Most tradespeople wait until the end of the week or month, then wonder why they’re always waiting to get paid. The faster you invoice, the faster you get paid. It really is that simple.
Do You Need to Charge VAT?
Only if you are VAT registered. You must register for VAT once your taxable turnover exceeds £90,000 in a 12-month period. Until then, you do not charge VAT and do not need to include it on your invoices.
Some sole traders choose to register voluntarily before hitting the threshold – beneficial if most of your customers are VAT-registered businesses themselves. Speak to an accountant if you’re unsure.
How to Keep Track of Your Invoices
At minimum, keep a simple spreadsheet with invoice number, customer name, amount, date sent, date paid, and outstanding balance. If you’re sending more than a handful of invoices a month, invoicing software makes this effortless – Jobber tracks all of this automatically so you always know exactly where you stand.
Common Invoicing Mistakes to Avoid
What trips most sole traders up
- No payment terms – always include a due date. Without one, customers have no urgency to pay.
- Duplicate invoice numbers – keep a running log and never reuse a number.
- Not keeping copies – save every invoice. You’ll need them for your Self Assessment return.
- Waiting to send – invoice on the day, every time. Don’t batch them up.
- Not following up – if an invoice is overdue, chase it. Most late payments are forgetfulness, not bad intent.
Jobber lets you send professional invoices from your phone the moment a job is complete – with automatic payment reminders, online payments, and full job tracking in one app.
Try Jobber Free for 14 Days →The Bottom Line
Invoicing as a sole trader doesn’t need to be complicated. Get your template set up properly once, include all the required details, send it the same day every job is done, and follow up if payment doesn’t arrive on time. Do those four things consistently and you’ll have far fewer cash flow headaches than most self-employed tradespeople.
Frequently Asked Questions
Every sole trader invoice must include: the word “Invoice” at the top; a unique sequential invoice number; the date issued; your full name or business name and address; the customer’s name and address; a description of the work carried out; the amount charged; the total amount due; and your payment details (bank name, sort code, account number). If you are VAT registered, also include your VAT number, the VAT rate, the VAT amount, and totals both including and excluding VAT. Non-VAT-registered sole traders must not charge VAT.
Only if you are VAT registered. The registration threshold is £90,000 taxable turnover in a rolling 12-month period. Below this threshold, you do not charge VAT and must not include it on your invoices. Above this threshold (or if you have voluntarily registered), you must charge VAT at the applicable rate (usually 20% standard rate) and include your VAT registration number on every invoice. Charging VAT when you are not registered is illegal. Some sole traders choose to register voluntarily before the threshold if most of their customers are VAT-registered businesses – speak to an accountant about whether this makes sense for you.
Use a simple sequential system starting from 001: INV-001, INV-002, INV-003 – or include the year for clarity: 2026-001, 2026-002. The only rule is that every invoice must have a unique number and you must never reuse a number. Sequential numbering makes it easy to spot gaps (missed invoices), track payment status, and locate specific invoices quickly. HMRC expects your invoices to be in order when they review your records. Invoicing software like Jobber handles numbering automatically, eliminating any risk of duplicates.
The same day the job is finished – not at the end of the week or month. Every day between completing a job and sending the invoice is a day that delays your payment. Send it the moment you finish. Customers who receive an invoice immediately after a job are also more likely to pay quickly – the work is fresh in their mind and the amount isn’t a surprise. Invoicing software like Jobber lets you send from your phone on site before you’ve even packed your tools away.
Always specify a concrete due date rather than just “payment due on receipt” (which is legally vague). For most domestic jobs: 14 days from invoice date is standard. For larger commercial contracts: 30 days (the UK legal default for B2B transactions where nothing else is agreed). For small jobs: “payment on completion” is reasonable. You can also include a late payment clause noting that overdue invoices from other businesses may incur statutory interest of 8% above the Bank of England base rate under the Late Payment of Commercial Debts Act – this encourages prompt payment without being confrontational.
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