Write invoices that actually get paid

Your invoice is a payment instruction, not a formality

Most freelancers treat invoices like admin. Something you do after the real work is done. But here's the thing — your invoice is the single most important document in getting paid. A clear, professional invoice with the right information gets paid faster than a vague one. Every time.

Let's look at what makes the difference.

What every UK freelance invoice must include

There are legal requirements. Miss any of these and your client has grounds to delay payment while they "clarify":

• Your name (or business name) and contact details
• Client's name and address
• Invoice number (sequential — INV-001, INV-002, etc.)
• Invoice date and due date
• Description of services — what you did, clearly stated
• Amount due including any VAT (if registered)
• Payment details — bank account, sort code, account number (or payment link)
• Payment terms — "Payment due within 14 days of invoice date"

If you're VAT registered, you also need your VAT number, the VAT rate, and the VAT amount shown separately.

Payment terms that work

The standard corporate payment term is 30 days. But you're not a corporation. You're a person who needs to pay rent. For freelancers, 14-day payment terms are perfectly reasonable and increasingly common.

State it clearly on the invoice: "Payment due within 14 days of invoice date."

Better yet, agree your payment terms in your contract before you start working. Then the invoice just confirms what was already agreed.

The late payment clause

Add this line to every invoice:

"Under the Late Payment of Commercial Debts (Interest) Act 1998, interest may be charged at 8% above the Bank of England base rate on invoices not paid within the agreed payment terms."

You rarely need to enforce it. But having it there in writing makes clients take your payment terms seriously.

When to send your invoice

The answer is almost always immediately. The day you deliver the work, send the invoice. Not next week. Not at the end of the month. Now.

Every day between delivery and invoicing is a day added to your payment timeline. If you deliver on Monday but don't invoice until Friday, you've already added 4 days to your wait.

For larger projects

Break payments into milestones:

• 30-50% deposit before you start
• 25-35% at midpoint (after first draft or key deliverable)
• Remaining balance on completion

This protects your cash flow and reduces the risk of non-payment on large projects.

What to do when you don't get paid

It happens. Here's the escalation:

• Day 1 after due date: Friendly reminder email. "Hi [name], just flagging that invoice [number] was due on [date]. Could you let me know when I can expect payment?"
• Day 7: Firmer follow-up. "This invoice is now 7 days overdue. Please arrange payment within the next 48 hours."
• Day 14: Formal notice. Reference your late payment clause and state that interest will begin accruing.
• Day 30+: Consider the Small Business Commissioner or small claims court for amounts up to £10,000.

Most clients pay after the first reminder. The ones who don't usually respond to the formal notice. Actual legal action is rare — but knowing the process gives you confidence.

Small things that make a big difference

• Include a payment link — clients who can pay in one click pay faster than clients who need to set up a bank transfer
• Number your invoices consistently — it looks professional and makes your records easier to manage
• Send a PDF — not a Word doc, not an email with amounts in the body. A proper PDF invoice.
• Follow up — a polite reminder on the due date is not rude. It's professional.

Getting paid isn't about luck. It's about having the right process. Start with a good invoice and the rest follows.