Quick answer
What does an invoice need to include?
Send it as soon as the agreed stage of the job is done. GOV.UK says every invoice must include:
- A unique invoice number
- Your business name, address and contact details
- Your customer's name and address
- A clear description of what you're charging for
- The date of the work, and the date of the invoice
- The amount and total (plus VAT, if you're VAT registered)
Sole traders: show your own name and any business name you use. If you trade under a business name, also give an address where legal documents can be sent to you. Limited companies: use the company's full registered name, and if you name any directors, name them all.
The jargon
The words you'll come across, in plain English.
- Invoice: the bill you send a customer for work done.
- Invoice number: a unique number for each invoice, usually in order, so each one can be tracked.
- Deposit: money paid up front, often for materials or to hold a date.
- Stage payment: a part payment due when a set stage of a bigger job is finished.
- Payment terms: when the invoice must be paid, like within 14 days.
- VAT invoice: an invoice with extra VAT details. Needed when both you and your customer are VAT registered.
- Overdue: an invoice that's gone past its due date unpaid.
Before you start
What should I agree about payment before starting?
Agree it before it gets awkward:
- Any deposit or stage payments
- What triggers each invoice
- When it's due
- How they can pay
- How changes are agreed
- What happens if there's a dispute
- Any late payment terms
Same day invoicing
How do I make sure I get paid on time?
Remove every reason to pay late:
- Have their details ready before you start.
- Note any agreed changes as you go.
- Send the invoice as soon as the stage is done, checked against the quote.
- Check the bank details on it before sending.
- Keep proof you sent it.
- Track every invoice: sent, due, paid, part paid or disputed.
- Chase as soon as it's overdue.
Bank detail scams
How do I protect my customers from bank detail scams?
Treat any change of bank details as high risk. Scammers send fake emails pretending to be you, with new bank details.
Do this
Your bank details stay the same, and any change is confirmed by phone on a number they already know.
Not this
A new account in an unexpected email, with the customer rushed to pay it.
If your bank details change, tell customers through a route they already trust. Never rely on an email alone.
Sources
Where this guide comes from.
Checked against these official pages on 27/10/2026. Next check due 27/01/2027. Rules and figures can change sooner, so check the official page again before making a tax, legal or money decision, and ask a qualified adviser about your own situation.
FAQs
Frequently asked questions.
Can I invoice before the work?
Yes, for an agreed deposit or stage payment. The invoice should match what was agreed.
Do I need invoice numbers?
Yes. GOV.UK says every invoice needs a unique number.
Can I use my personal bank account?
Use an account for the business, and check the details are right.
What if they dispute part of it?
Note exactly what's disputed, show your evidence, and get advice before separating the amounts.
Should I take a deposit?
It can pay for materials and hold the date, as long as the amount, timing and refund terms are fair and clear.
Should the invoice match the quote?
Yes. It should be easy to match to the quote and any agreed changes, with no new or vague charges.
Do I need a VAT invoice?
Only if you're VAT registered and your customer is too. It needs extra details, listed on GOV.UK.
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