How to Invoice as a Freelancer in the UK

Invoicing is one of those freelance tasks that sounds simple but has real rules behind it — especially in the UK. Get it right and clients pay faster. Get it wrong and you could face delays, disputes, or HMRC headaches.

This guide covers everything you need to know.

What Must Be on a UK Freelance Invoice?

HMRC has clear requirements for what a valid invoice must include:

Your name and address (or your business name if trading as one)
Client's name and address
Invoice number — a unique sequential number (e.g. INV-001)
Invoice date
Description of services — what you did, how many hours or units
Amount charged — clearly broken down
Total amount due
Payment due date

If you're VAT-registered, you also need to include:

Your VAT registration number
The VAT rate applied
The VAT amount
The total including VAT

Do You Need to Charge VAT?

Only if you're VAT-registered. You must register for VAT if your taxable turnover exceeds £90,000 in a 12-month period (as of 2024/25). Below that threshold, VAT registration is optional — many freelancers choose not to register to keep invoicing simpler.

If you're not VAT-registered, simply don't include VAT on your invoices. No need to explain it to clients.

Payment Terms

"Payment terms" means when you expect to be paid. Common terms:

Immediate — due on receipt
Net 7 — due within 7 days
Net 30 — due within 30 days

Most UK freelancers use Net 14 or Net 30. For new clients or large projects, asking for a 50% deposit upfront is entirely normal.

Under the Late Payment of Commercial Debts (Interest) Act 1998, you're legally entitled to charge interest on late payments from UK businesses — currently 8% above the Bank of England base rate. It's worth mentioning this on your invoice as a polite deterrent.

How to Get Paid Faster

Send the invoice the same day you finish the work — don't wait a week
Make payment easy — include your bank details or a payment link
Follow up promptly — a polite reminder on the due date is normal and expected
Use clear invoice numbers — makes it easy for accounts teams to process

Creating Your Invoice

You can create professional, PDF-ready invoices instantly at Billdrop — no account needed. It handles VAT, discounts, multiple currencies, and lets you download a clean PDF in one click.

No spreadsheets. No fiddly Word documents. Just fill in the form and download.