A surprising number of tradespeople still send invoices that are missing basic information. Not because they're careless, but because nobody ever taught them what a proper invoice should look like.
The result? Delayed payments. Customers who “lost” the invoice. Arguments about what was agreed. All of this is avoidable with a clean, professional invoice that has everything on it.
Here's exactly what you need to include, why it matters, and the mistakes that trip people up.
What Every UK Invoice Must Include
HMRC doesn't legally require non-VAT-registered sole traders to issue invoices in a specific format. But if you want to get paid on time and keep your records straight, your invoice should include all of the following:
1. Your Business Details
Your full name (or trading name), address, phone number, and email. If you're VAT registered, include your VAT number.
Tired of doing this manually? mNudge handles it on WhatsApp.
2. Your Client's Details
Their name and address. For commercial clients, include their business name. This matters if you ever need to chase formally.
3. Invoice Number
A unique sequential number. INV-0001, INV-0002, etc. This is how both you and your customer identify the invoice. Never reuse a number.
4. Invoice Date
The date you issued the invoice. Not the date you did the work (though you can include that separately as a job date).
5. Description of Work
Be specific. “Plumbing work” is vague. “Replaced hot water cylinder and fitted 2x isolation valves at 14 Oak Lane” is clear and leaves no room for dispute.
6. Amount Due
The total in GBP. If VAT registered, show the net amount, VAT amount, and gross total separately. For labour-and-materials jobs, it's good practice to break these out.
7. Payment Terms
When is payment due? “Due within 7 days” or “Due on receipt” are common. Whatever you agreed at the quoting stage — put it on the invoice.
8. Payment Due Date
Spell it out: “Payment due by 21st April 2026.” Don't make your customer do the maths.
9. Bank Details
Account name, sort code, and account number. If you accept other payment methods, list those too. The easier you make it to pay, the faster you get paid.
Example Invoice Walkthrough
Here's what a proper tradesperson's invoice looks like. Nothing fancy — just clear and complete:
Dave Wilson Plumbing
12 Station Road, Leeds LS1 4AP
07700 900123
dave@davewilsonplumbing.co.uk
INVOICE
INV-0047
Date: 14 April 2026
Bill To:
Mrs Sarah Thompson
8 Meadow Close, Leeds LS6 2NR
Payment terms: Due within 7 days
Due date: 21 April 2026
Bank transfer to: D Wilson / 20-30-45 / 12345678
Reference: INV-0047
Clean. Professional. Everything the customer needs to pay you without asking a single question.
Common Invoice Mistakes
These are the ones we see most often from tradespeople. Any one of them can delay your payment:
- No payment terms.If you don't say when payment is due, the customer decides. And their answer is always “later.”
- No invoice number.Makes it impossible to reference in follow-ups. “That invoice I sent last month” doesn't cut it.
- Vague descriptions.“Work carried out” tells the customer nothing. Be specific about what you did and where.
- Missing bank details.You'd be amazed how many invoices don't include payment information. The customer then has to ask, which adds days.
- Sending it late. An invoice sent a week after the job feels less urgent than one sent the same day. Speed matters.
- No specific due date.“Due within 14 days” is fine, but also write the actual date. “Due by 28th April” is harder to ignore.
- Unprofessional format.A scribbled note or a plain-text WhatsApp message doesn't command the same respect as a proper PDF. Perception matters.
VAT vs Non-VAT Invoices
If you're below the VAT threshold (£90,000 as of 2026), your invoice doesn't need a VAT number or VAT breakdown. Just show the total amount.
If you are VAT registered, your invoice must include your VAT registration number, and you need to show the net amount, VAT rate (usually 20%), VAT amount, and gross total separately. HMRC are specific about this.
Skip the Template Entirely
Templates are useful. But you still have to open a document, fill in the fields, save it as a PDF, and send it. That's 10 minutes of admin per invoice — minimum. When you're doing three jobs a day, that adds up.
With mNudge, you skip all of that. Send a WhatsApp voice note or text message describing the job: “Bill Sarah Thompson, 865 quid for replacing a hot water cylinder and fitting isolation valves at 8 Meadow Close.”
mNudge turns that into a professional PDF invoice with all the required fields, sends it to your client on WhatsApp with a one-tap payment link, and automatically chases if they don't pay on time.
No template. No laptop. No admin. Just describe the job, confirm the details, and get paid.