How to Write a Final Demand Letter for B2B Debt (With Free UK Template)

If you are reading this, your internal credit control process has likely hit a brick wall. You have sent the polite reminders, you have made the awkward phone calls, and the debtor’s accounts department is either feeding you generic excuses or ignoring you entirely.

When a commercial invoice crosses from being "late" to becoming a "bad debt," the time for polite negotiation is over. It is time to issue a Final Demand Letter, often referred to in UK legal terms as a Letter Before Action (LBA).

In my 15 years of managing corporate ledgers and overseeing B2B debt recovery, I have seen thousands of demand letters. The harsh reality is that a poorly drafted letter will be thrown straight into the debtor’s bin. However, a legally robust, professionally formatted LBA is often the exact shock to the system required to jolt a debtor into paying immediately.

In this guide, I will walk you through the legal requirements of a commercial final demand in the UK, how to leverage statutory late fees, and provide a free, copy-and-paste template you can use today.

Why B2B Demand Letters are Different

It is vital to understand that commercial debt recovery operates under different rules than consumer debt. If you are a business pursuing another business (a Limited Company, LLP, or registered sole trader acting in a commercial capacity), you are not bound by the same restrictive consumer protection protocols.

However, the UK courts still expect you to behave reasonably. Under the Ministry of Justice’s Practice Direction on Pre-Action Conduct, you must give the debtor a final, clear opportunity to settle the matter or dispute the debt before you initiate formal legal proceedings.

The Golden Rule: Never Make an Empty Threat

The most common mistake UK SMEs make is writing a letter that says, "If you do not pay, we may consider taking further action." To a serial late payer, "may consider" translates to "we are not going to do anything."

Your Final Demand must be an ultimatum. It must state clearly that if payment is not received in cleared funds by an exact date, you will escalate the matter to a third-party debt collection agency or commence legal proceedings. Crucially, you must be prepared to follow through.

Leveraging The Late Payment Act 1998

When writing your final demand, you should explicitly invoke your rights under the Late Payment of Commercial Debts (Interest) Act 1998. If your B2B contract does not have a specific late payment clause, this Act allows you to legally add the following to your debtor's outstanding balance:

• Statutory Interest: Charged at 8% plus the Bank of England base rate, calculated daily.
• Fixed Compensation: You can charge £40 for debts under £1,000; £70 for debts under £10,000; and £100 for debts of £10,000 or more, per overdue invoice.
• Reasonable Recovery Costs: You can legally warn the debtor that if you are forced to instruct a commercial debt collection agency, their commission costs will be added to the debtor's total liability.

Free UK B2B Final Demand Letter Template

Copy the text below onto your official company letterhead. Fill in the bracketed information. Send the letter via email AND via Royal Mail Signed For (Recorded Delivery) so you have proof of receipt.

What to Do When the Letter is Ignored

In a perfect world, the letter above will land on the desk of a Financial Director, they will realise you mean business, and the funds will be wired that afternoon. However, if your deadline expires and the money is not in your account, you must act immediately. Do not send another warning.