If you're a sole trader — plumber, electrician, builder, carpenter, decorator — you need to invoice your customers. That much is obvious. But what actually needs to be on a sole trader invoice? And what's the difference between a sole trader invoice and a limited company or VAT-registered invoice?
This guide covers exactly what your invoice needs, walks through a real example, flags the mistakes that delay payments, and gives you a free template you can use straight away.
Sole Trader vs VAT-Registered: What's the Difference?
The good news: if you're not VAT registered (i.e. your turnover is below the £90,000 VAT threshold), your invoicing requirements are simpler. You don't need a VAT number. You don't need to show a VAT breakdown. You just show the total amount.
The key differences:
| Invoice Element | Sole Trader (Non-VAT) | VAT Registered |
|---|---|---|
| Your name/business name | Required | Required |
| Address | Required | Required |
| Invoice number | Recommended | Required |
| VAT number | Not needed | Required |
| VAT breakdown (net/VAT/gross) | Not needed | Required |
| Description of work | Required | Required |
| Total amount | Required | Required (with VAT split) |
Even though invoice numbers aren't technically “required” for non-VAT sole traders, always use them. They make your life infinitely easier when chasing payments or doing your tax return.
What Your Sole Trader Invoice Needs
Here's the full list, with notes on each:
- Your full name or trading name. “Mike Roberts” or “MR Electrical Services” — whichever you use professionally.
- Your address.Your registered business address. If you work from home, that's your home address.
- Your phone number and email.So the customer can contact you if there's a query.
- Your customer's name and address. Full name, property address where the work was done.
- A unique invoice number. Sequential: INV-0001, INV-0002, etc. Simple and impossible to confuse.
- The invoice date. When you issued it, not when you did the work.
- A clear description of the work.Not “electrical work” but “Install 3x double sockets in kitchen extension, supply and fit consumer unit upgrade from 6-way to 10-way.”
- The total amount.In GBP. If you break out labour and materials separately, even better — it builds trust.
- Payment terms.“Due within 7 days” or “Due on receipt.” Plus the actual due date.
- Your bank details. Account name, sort code, account number, and a payment reference.
Tired of doing this manually? mNudge handles it on WhatsApp.
Example Sole Trader Invoice
MR Electrical Services
Mike Roberts
22 Chapel Street, Bristol BS1 5JD
07700 900456 | mike@mrelectrical.co.uk
INVOICE
INV-0012
Date: 14 April 2026
Invoice To:
Mr James Chen
45 Woodland Drive, Bristol BS9 1QT
Payment terms: Due within 7 days of invoice date
Due date: 21 April 2026
Pay by bank transfer: M Roberts / 30-90-12 / 87654321
Reference: INV-0012
Thank you for your business. Late payment interest may be charged at 8% above the Bank of England base rate on overdue invoices.
Notice: no VAT number, no VAT breakdown, no company registration number. Because Mike is a sole trader below the VAT threshold, none of that is needed. Clean and simple.
Common Mistakes on Sole Trader Invoices
We've seen thousands of tradesperson invoices. These mistakes come up again and again:
- No payment terms or due date.This is the single biggest cause of late payments. If the invoice doesn't say when to pay, the customer assumes “whenever.”
- No invoice number.You can't chase “that invoice from last month” effectively. Numbers make everything traceable.
- Using the wrong date. The invoice date should be when you issue the invoice, not the job date. This matters for calculating when payment is due and for your tax return.
- Vague descriptions.“Building work — £2,400” invites questions. “Kitchen extension: lay 12sqm floor tiles, fit skirting, paint walls (2 coats) — labour £1,600, materials £800” does not.
- Missing bank details.If the customer has to message you asking “how do I pay?” you've already lost two days.
- Charging VAT when not registered.If you're not VAT registered, you cannot add VAT to your invoices. This is illegal and can result in penalties from HMRC.
Keeping Records for Your Tax Return
As a sole trader, you're required to keep records of all your income for your Self Assessment tax return. Every invoice you issue is a record of income. Keep copies of everything — either digital PDFs or paper copies — for at least five years. HMRC can ask to see them.
Sequential invoice numbers make this straightforward. At the end of the tax year, you can see at a glance: INV-0001 through INV-0047, total income £X. Done.
Or Skip the Template Entirely
Templates are a good starting point. But they're still admin. You still have to open a document, fill in every field, save it as a PDF, send it, and then remember to chase it if they don't pay.
mNudge lets you skip all of that. Just tell it what the job was:
You (WhatsApp voice note):
“Bill James Chen, 595 quid, installed three double sockets in his kitchen extension and upgraded the consumer unit at 45 Woodland Drive.”
mNudge creates a professional PDF invoice with your business details, the right invoice number, a clear description, payment terms, and a one-tap payment link. It sends it to your client on WhatsApp. If they don't pay on time, mNudge chases automatically.
No template. No laptop. No filling in fields. No remembering to chase. Just describe the job, confirm the details, and get paid.