How to Invoice as a Sole Trader in the UK 2026
Going self employed as a tradesperson is one of the best decisions you can make — more control, better money, and no one telling you what to do.
But if you’ve come from employment, invoicing can feel like a minefield at first.
What do you include? How do you number them? Do you need to charge VAT? What happens if someone doesn’t pay?
This guide answers all of it — clearly, in plain English, with 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?
As a sole trader in the UK your invoices must include the following by law:
- 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 at least a 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
If you are VAT registered you must also include:
- Your VAT registration number
- The VAT rate applied
- The VAT amount charged
- The total including and excluding VAT
If you are 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 your records organised and makes it easy to track which invoices have been paid.
The simplest approach is a sequential number starting at 001:
- INV-001
- INV-002
- INV-003
Some sole traders prefer to include the year for extra clarity:
- 2026-001
- 2026-002
Either works fine. The important thing is that no two invoices ever share the same number.
What Payment Terms Should You Use?
Payment terms tell your customer when you expect to be paid.
The most common terms for UK tradespeople are:
Payment within 14 days — standard for most domestic jobs Payment within 30 days — common for commercial or larger contracts Payment on completion — useful for smaller jobs where you want paying on the day
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
You have a few options:
Email as PDF — the most common approach. Create your invoice in Word or Google Docs, save as PDF, and email it directly to your customer. Clean, professional, and easy to track.
Invoicing software — tools like Zoho Invoice (free) or Tradify let you create and send invoices directly from an app, track whether they’ve been opened, and send automatic payment reminders. Saves significant time if you’re sending multiple invoices a week.
Post — rarely used now but occasionally required for older customers or certain contracts. Always send recorded delivery if posting invoices.
When Should You Send Your Invoice?
As soon as the job is done.
Most tradespeople wait until the end of the week or even the end of the month to send invoices — and then wonder why they’re always waiting to get paid.
The moment a job is finished, send the invoice. Even if you’re still on site. Tools like Tradify let you do this from your phone in minutes before you’ve even packed your tools away.
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 for VAT voluntarily before hitting the threshold — this can be beneficial if most of your customers are VAT registered businesses themselves. Speak to an accountant if you’re unsure whether this applies to you.
How to Keep Track of Your Invoices
Keeping on top of which invoices have been paid, which are outstanding, and which are overdue is one of the most important habits you can build as a sole trader.
At minimum, keep a simple spreadsheet with:
- Invoice number
- Customer name
- Amount
- Date sent
- Date paid
- Outstanding balance
If you’re sending more than a handful of invoices a month, invoicing software makes this effortless. Tools like Zoho Invoice or Tradify track all of this automatically so you always know exactly where you stand.
📄 Related: What Should a Tradesperson Invoice Include?
Common Invoicing Mistakes to Avoid
Forgetting to include payment terms — always include a due date. Without one, customers have no urgency to pay.
Using the same invoice number twice — keep a running log and never duplicate numbers.
Not keeping copies — save every invoice you send. You’ll need them for your Self Assessment tax return.
Waiting too long to send — invoice on the day, every time.
Not following up — if an invoice is overdue, chase it. Politely but promptly. Most late payments are down to forgetfulness rather than bad intent.
Not sure which invoicing tool to use? Our roundup of the best invoicing software for UK tradespeople compares all the main options.
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.
Ready to take your invoicing to the next level?
🔧 Best Free Invoice Templates for UK Tradespeople 2026 — download a free professional template and get started today.
🏆 How One Glasgow Bodyshop Used AI Tools to Dominate Local Search — real results from a real UK trade business.
TradeStack HQ helps UK tradespeople find the best tools to run smarter businesses. We only recommend tools we’d genuinely use ourselves.