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How to Chase Unpaid Invoices UK: Email Templates & Legal Steps (2026 Guide)
Published: 8 March 2026 · For UK freelancers, sole traders, and small business owners
You did the work. You sent the invoice. The due date passed. Now you're staring at your inbox wondering whether to send another "just checking in" email or hire a debt collector.
You're not alone. Late payment affects 62% of UK freelancers, with the average small business owed £22,000 in overdue invoices at any given time (FSB, 2025). It's the single biggest cash flow killer for self-employed people.
This guide gives you a 5-stage escalation system — from friendly reminder to legal action — with copy-paste email templates at each stage. The goal: get paid without burning the relationship, but with teeth if you need them.
Before You Start: Know Your Rights
UK law is actually very much on your side when it comes to late payment. Most freelancers don't know this:
Your Legal Rights Under the Late Payment of Commercial Debts (Interest) Act 1998
- Statutory interest: You can charge 8% + Bank of England base rate (currently 4.5%) = 12.5% annual interest on overdue invoices
- Fixed compensation:
- Debts up to £999.99 → £40 compensation
- Debts £1,000 - £9,999.99 → £70 compensation
- Debts £10,000+ → £100 compensation
- Reasonable recovery costs: You can claim the cost of chasing the debt (professional fees, etc.)
You don't need a contract clause for this. These are statutory rights that apply automatically to all B2B transactions. Having it in your contract helps, but even without one, the law is on your side.
Use our late payment interest calculator to work out exactly how much you're owed including statutory interest.
The 5-Stage Escalation System
The key principle: start friendly, get progressively more formal. Most invoices get paid in stages 1-2. Stages 3-5 are your insurance policy.
| Stage | When | Tone | Success Rate |
|---|
| 1. Friendly Reminder | 1-3 days overdue | Casual, helpful | ~60% |
| 2. Firm Follow-Up | 7 days overdue | Professional, direct | ~25% |
| 3. Formal Notice | 14 days overdue | Formal, references terms | ~10% |
| 4. Final Demand (LBA) | 21-28 days overdue | Legal language, deadline | ~4% |
| 5. Legal Action | 35+ days overdue | Court proceedings | ~1% |
Key insight: 85% of late invoices get resolved with a simple reminder. The person forgot, lost the email, or their accounts payable cycle is slow. Don't go nuclear on day one.
Stage 1: The Friendly Reminder (1-3 Days Overdue)
When to send: 1-3 days after due date
Goal: Remind without making it awkward. Give them an easy way to respond.
Subject: Invoice [NUMBER] — quick payment check
Hi [NAME],
Hope you're well. Just a quick one — invoice [NUMBER] for £[AMOUNT] was due on [DATE]. Wanted to check it's been received and there aren't any issues on your end.
I've reattached it below for convenience.
If it's already in the payment queue, please ignore this — I know these things can take a few days to process.
Any questions at all, just let me know.
Best,
[YOUR NAME]
Why this works: It's not accusatory. It gives them an out ("if it's already in the queue"). It reattaches the invoice (solving the "I can't find it" excuse). And it's short — busy people respond to short emails.
Stage 2: The Firm Follow-Up (7 Days Overdue)
When to send: 7 days after due date (if no response to Stage 1)
Goal: Make it clear you're tracking this. Reference payment terms. Request a specific date.
Subject: Invoice [NUMBER] — payment now overdue (£[AMOUNT])
Hi [NAME],
Following up on my email from [DATE OF FIRST REMINDER]. Invoice [NUMBER] for £[AMOUNT] is now [X] days past the due date of [DUE DATE].
Could you let me know when I can expect payment? If there's an issue with the invoice or the work, I'm happy to discuss — but I do need to get this resolved.
Per our agreed terms, payment was due within [PAYMENT TERMS] days. I'd appreciate confirmation of a payment date by [DATE — 3 days from now].
Invoice attached again for reference.
Thanks,
[YOUR NAME]
What's changed: The subject line now says "overdue." You're asking for a specific payment date, not just checking in. You've referenced the agreed terms. The tone is still professional but the urgency has increased.
Stage 3: The Formal Notice (14 Days Overdue)
When to send: 14 days after due date
Goal: Put on record that you're aware of your statutory rights. Mention interest. Set a hard deadline.
Subject: OVERDUE: Invoice [NUMBER] — formal payment notice
Dear [NAME],
I am writing to formally notify you that invoice [NUMBER] for £[AMOUNT], dated [INVOICE DATE] with a due date of [DUE DATE], remains unpaid. This invoice is now [X] days overdue.
Previous reminders were sent on [DATES OF PREVIOUS EMAILS].
Under the Late Payment of Commercial Debts (Interest) Act 1998, I am entitled to charge statutory interest of 8% plus the Bank of England base rate on overdue commercial debts, as well as fixed compensation of £[40/70/100].
I would prefer to resolve this without exercising those rights. Please arrange payment of the outstanding £[AMOUNT] within 7 days — by [SPECIFIC DATE].
If there is a dispute regarding the work or the invoice amount, please contact me immediately so we can resolve it.
I look forward to hearing from you.
Kind regards,
[YOUR NAME]
[YOUR BUSINESS NAME]
[YOUR ADDRESS]
⚠️ Important: From this stage onward, switch from "Hi [first name]" to "Dear [full name]." Use your full business details. This creates a paper trail that's useful if you eventually need to take legal action.
Stage 4: The Final Demand / Letter Before Action (21-28 Days Overdue)
When to send: 21-28 days after due date
Goal: Final warning before legal proceedings. Courts expect to see this letter before you file a claim.
Subject: Letter Before Action — Invoice [NUMBER] (£[AMOUNT])
Dear [FULL NAME / COMPANY NAME],
LETTER BEFORE ACTION
I write regarding the outstanding payment of invoice [NUMBER] for £[AMOUNT], dated [INVOICE DATE], which was due for payment on [DUE DATE] and is now [X] days overdue.
Despite previous correspondence on [LIST DATES], payment has not been received and no satisfactory explanation has been provided.
The outstanding amount is:
Original invoice: £[AMOUNT]
Statutory interest (12.5% p.a., [X] days): £[CALCULATED AMOUNT]
Fixed compensation: £[40/70/100]
Total now due: £[TOTAL]
I hereby give you 14 days from the date of this letter — that is, until [SPECIFIC DATE] — to make payment of the total amount of £[TOTAL].
If payment is not received by this date, I will commence legal proceedings through the County Court without further notice. The court filing fee (£[AMOUNT]) and any additional costs will be added to the claim.
I strongly advise you to seek independent legal advice if you intend to dispute this claim.
Payment should be made to:
[BANK DETAILS]
Yours faithfully,
[YOUR FULL NAME]
[YOUR BUSINESS NAME / TRADING NAME]
[YOUR FULL ADDRESS]
[DATE]
Why send this even if you're not sure about going to court: A Letter Before Action is the single most effective debt recovery tool for freelancers. Most debtors pay when they receive one because they know you're serious. The cost of ignoring it (court fees, judgment on their credit record) outweighs the invoice amount.
Stage 5: Legal Action (35+ Days Overdue)
If the Letter Before Action doesn't work, you have real options. They're simpler and cheaper than most people think.
Option A: Money Claim Online (Small Claims Court)
For debts up to £10,000 in England and Wales:
- File your claim at moneyclaim.gov.uk
- Court fee ranges from £35 (claims up to £300) to £455 (claims £5,001-£10,000)
- The defendant has 14 days to respond
- If they don't respond, you get a default judgment (automatic win)
- If they dispute it, there's a hearing (usually informal, no lawyers needed)
- Court fees can be added to your claim
| Claim Amount | Court Fee |
|---|
| Up to £300 | £35 |
| £300.01 - £500 | £50 |
| £500.01 - £1,000 | £70 |
| £1,000.01 - £1,500 | £80 |
| £1,500.01 - £3,000 | £115 |
| £3,000.01 - £5,000 | £205 |
| £5,000.01 - £10,000 | £455 |
Option B: Statutory Demand (Debts Over £750)
For undisputed debts over £750, you can serve a Statutory Demand. If the debtor doesn't pay within 21 days, you can petition for their bankruptcy (individuals) or winding-up (companies). This is nuclear — but incredibly effective for companies that are clearly able to pay but choosing not to.
Option C: Mediation
For debts where the relationship matters (ongoing client you want to keep), mediation through a service like the Small Business Commissioner is free and can resolve disputes without court.
Prevention: How to Stop Late Payments Before They Happen
The best invoice chasing system is one you never need to use. Here's what actually prevents late payment:
1. Take a Deposit Before Starting Work
30-50% upfront is industry standard for freelance work. Anyone who refuses to pay a deposit is telling you something about how they'll treat the final invoice.
2. Use Milestone Billing
Break projects into stages with a payment at each milestone. Never let the outstanding amount get so large that you can't afford to walk away.
3. Set Clear Payment Terms (Net-14, Not Net-30)
Net-30 is standard but often means you get paid in 45-60 days. Net-14 with automated reminders dramatically improves payment speed.
4. Include Late Payment Terms in Your Contract
Even though statutory interest applies automatically, having it in your contract makes clients take it seriously. Something like:
"Payment is due within 14 days of invoice date. Late payments will incur statutory interest at 8% plus the Bank of England base rate, plus fixed compensation of £40-£100 as provided by the Late Payment of Commercial Debts (Interest) Act 1998."
5. Send Invoices Immediately
The clock starts when you send the invoice, not when you finish the work. Send it the same day you deliver.
6. Automate Reminders
Set up automatic email reminders at: 3 days before due date, on due date, 1 day after, 7 days after. Most invoicing software handles this. Our payment reminder generator creates professional reminder sequences you can copy into your email client.
Statutory Interest Calculator
Need to calculate exactly how much you're owed? Our Late Payment Interest Calculator works it out automatically — just enter the invoice amount, due date, and today's date.
Example: A £2,000 invoice that's 60 days overdue accrues approximately £41 in statutory interest (12.5% annual rate) plus £70 fixed compensation = £2,111 total owed.
💼 Get the Complete Invoice Chasing Toolkit
This guide covers the essentials, but if you want the full system:
Our Getting-Paid Toolkit (£19) includes 12 professional email templates (covering every scenario from friendly reminders to formal demand letters), contract clauses, a payment terms generator, and a complete late payment recovery playbook.
For a lighter-touch solution, the Invoice Email Pack (£7) gives you 12 ready-to-use email templates for every stage of the invoice lifecycle.
Frequently Asked Questions
Can I charge interest on unpaid invoices if it's not in my contract?
Yes. The Late Payment of Commercial Debts (Interest) Act 1998 gives you statutory rights to charge interest and claim compensation on late B2B payments. You don't need a contract clause — it's the law. Having it in your contract simply makes clients more likely to pay on time.
How long should I wait before escalating?
Follow the timeline in this guide: friendly reminder at 1-3 days, firm follow-up at 7 days, formal notice at 14 days, Letter Before Action at 21-28 days. Most invoices get paid within the first two stages.
Will taking a client to court damage the relationship?
A client who refuses to pay for work you've completed has already damaged the relationship. Small claims court is designed for exactly this situation — it's fast, affordable, and doesn't require a solicitor.
What if the client disputes the work?
If there's a genuine dispute about the quality or scope of work, courts expect you to attempt resolution before filing. Respond to their concerns in writing, offer to fix any genuine issues, and keep a record of everything. A dispute is only valid if they raised it before or when the invoice was due — not weeks later when you start chasing payment.
Should I use a debt collection agency?
For small invoices (under £1,000), the cost of a debt collector often exceeds what you'd recover. Small claims court is usually cheaper and more effective. Debt collectors can be useful for larger amounts or when you've exhausted other options.
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