What to Do When a Client Doesn't Pay a UK Invoice: Step-by-Step Recovery Guide

Late payment is the single biggest threat to UK freelancers, sole traders, and small business cash flow. According to Federation of Small Businesses (FSB) studies, over 50,000 UK small enterprises fold every year solely due to chronic delayed billing.

If you sent an invoice with 30-day terms and the due date has passed with radio silence from your client, panic is the wrong response — action is. In the UK, small businesses enjoy powerful statutory legal protections under the Late Payment of Commercial Debts (Interest) Act 1998. Here is your chronological, step-by-step roadmap to recovering unpaid money without burning professional bridges unnecessarily.

Your UK Statutory Rights: Interest & Compensation

Under British law, you do not need a custom contract clause to penalize late corporate payers. As long as the transaction is business-to-business (B2B), the law automatically grants you:

1. Statutory Interest: Charged at 8% plus the Bank of England base rate. If the base rate is 5%, your annual statutory interest rate is 13%. This accrues daily from the day after the due date.
2. Fixed Statutory Compensation Fees: Under Section 5A of the Act, you are entitled to charge a fixed compensation penalty to cover administrative debt recovery:
   • £40 for debts up to £999.99
   • £70 for debts between £1,000 and £9,999.99
   • £100 for debts of £10,000 or more
3. Reasonable Recovery Costs: If your actual debt collection costs exceed the fixed compensation, you can claim the additional costs from the debtor.

The 4-Stage Recovery Escalation Timeline

Stage 1: Days 1–7 Overdue (The Polite Inquiry)

Invoices are often delayed by mundane accounting oversight rather than malice — an AP clerk was on holiday, a PO number was missing, or an email was filtered to spam.

• Send a polite email attaching the original PDF invoice generated via InvoiceFast UK.
• Subject line: "Invoice #INV-2041 — Friendly reminder (Overdue)".
• Confirm they have the correct bank details: Sort Code, Account Number, and Confirmation of Payee (CoP) name.

Stage 2: Day 14 Overdue (The Formal Notice of Statutory Terms)

If two weeks pass with no payment or explanation, escalate from polite customer service to formal credit control:

• Email the finance director or business owner directly.
• Explicitly reference the Late Payment of Commercial Debts (Interest) Act 1998.
• Example wording: "As our invoice #INV-2041 is now 14 days overdue, please note that under the Late Payment of Commercial Debts Act 1998, we reserve our statutory right to claim £70 in compensation and 13% annual interest accruing daily. Please confirm payment by Friday to avoid additional statutory charges."

Stage 3: Day 30 Overdue (Letter Before Action - LBA)

A Letter Before Action (LBA) is the final pre-litigation step required under the UK Pre-Action Protocol for Debt Claims:

• Send via recorded signed-for postal delivery and email.
• Specify the exact debt breakdown: original invoice amount, £40–£100 statutory compensation fee, and itemized daily interest.
• Give a strict deadline (typically 7 to 14 days) to settle in full before County Court proceedings are filed.

Stage 4: Day 45+ Overdue (Money Claim Online / Small Claims Court)

If the LBA is ignored, take legal action through Money Claim Online (MCOL), HM Courts & Tribunals Service's official digital small claims portal for debts up to £100,000 in England and Wales:

• Court filing fees are low (typically £35 to £455 depending on claim size) and are added to the debtor's bill upon judgment.
• Over 80% of commercial debtors pay immediately upon receiving an official court notice to avoid a County Court Judgment (CCJ), which ruins corporate credit ratings and prevents them from securing business loans or merchant accounts.

How to Protect Your UK Cash Flow Going Forward

• Always specify payment terms: In InvoiceFast, select the Net 30 or Net 14 term button with one click.
• Include your bank Faster Payments info: Display your 6-digit Sort Code and 8-digit Account Number prominently in the Notes field so clients have zero excuses.
• Add a statutory warning in your invoice footer: "Payment terms: Net 30. We exercise our statutory right to claim interest and compensation under the Late Payment of Commercial Debts (Interest) Act 1998 on late payments."