Use case

Letters Before Action for Unpaid Invoices

Last updated: June 2026

A Letter Before Action (LBA) is the formal, final written demand you send a customer before starting court proceedings over an unpaid invoice. It sets out the debt, what is owed, and a deadline to pay or respond. It is a standard step in UK pre-action conduct — sending a clear LBA before issuing a claim is expected by the courts.

What is a Letter Before Action?

A Letter Before Action — sometimes called a letter before claim or a final demand — is a written notice telling a debtor that you intend to take court action unless they pay the outstanding invoice or respond by a stated date. It is the last step before you issue a claim, and it gives the other side a fair, documented chance to settle.

The English courts expect parties to try to resolve a dispute before going to court. A clear, professional LBA shows you have followed that expectation. It is not a court document and it does not by itself create any debt or judgment — it is a structured demand that puts the position in writing.

What should a Letter Before Action include?

A well-prepared LBA leaves no room for confusion about who owes what, and why. The essentials usually are:

ElementWhat it covers
Your detailsWho is making the claim, and your contact details for payment and correspondence.
The debtorThe correct legal name of the debtor — the limited company or the sole trader / individual.
The debtThe invoice number(s), date(s), amount(s), and what the money is for.
Interest and costsAny statutory interest and fixed compensation you intend to claim, set out clearly.
What you wantA clear demand to pay or respond, and where and how to pay.
The deadlineA reasonable deadline to pay or reply, appropriate to the type of debtor.
Next stepA statement that you may start court proceedings if there is no payment or response.
Supporting evidenceReference to, or copies of, the invoice and the records that support the debt.

Company debtor or sole-trader debtor — do the rules differ?

Yes. The pre-action rules depend on who the debtor is, and this changes the deadline you should give.

If the debtor is a limited company (a business-to-business debt), you generally follow the Practice Direction on Pre-Action Conduct and Protocols. There is no fixed reply period, but a reasonable deadline — commonly at least 14 days — is typical before issuing a claim.

If the debtor is an individual or sole trader, the Pre-Action Protocol for Debt Claims applies. That protocol is more prescriptive: it expects a specific letter of claim with prescribed information and forms, and it generally gives the debtor 30 days to respond before you start a claim.

Getting the debtor type right matters. Sending a 14-day company-style letter to a sole trader, or skipping the protocol information an individual debtor is entitled to, can undermine your position. Check Companies House or your contract if you are unsure whether you are dealing with a company or an individual.

How does WolfX help you prepare an evidence-backed LBA?

WolfX is software for UK B2B businesses. It helps you organise an overdue invoice into an evidence-backed recovery workflow and prepare a Letter Before Action draft from your own records. You bring the invoice, the contract or purchase order, delivery or sign-off evidence, and your reminder history; WolfX helps you assemble them into a structured, consistent demand.

The Evidence Vault lets you store and reference the records behind the debt, so the figures in your letter — the principal, any interest, and any fixed compensation — trace back to source documents. WolfX prompts you to confirm the debtor type so the draft reflects the right pre-action approach for a company or an individual. The output is a draft for you, your team, a solicitor, or your compliance reviewers to check before anything is sent.

What happens after you send an LBA?

Once the letter goes out, you wait for the deadline. The debtor may pay in full, dispute the debt, propose a payment plan, ask for documents, or simply not respond. Keep a record of what happens — every reply, payment, and missed deadline is part of the evidence trail.

If the debt is paid, the matter is resolved. If it is disputed, you may need to exchange information and try to narrow the issues. If the deadline passes without payment or a genuine response, court proceedings may be the next step. WolfX can also help you prepare a Court Readiness Pack — an organised bundle of the evidence behind the claim — to support internal, solicitor, or pre-action review. A Court Readiness Pack is not a court filing and is not an official or certified court document.

What does WolfX not do?

WolfX is not a law firm, a solicitor, a court, a regulated debt collector, or a payment processor, and it does not provide legal advice. It does not guarantee that you will recover the debt. It does not file court claims on your behalf, it does not collect payments from debtors directly, and it does not currently send physical post. It helps you prepare and organise the evidence and documents — the decision to send the letter or start a claim is yours, and you should take your own advice where you need it.

WolfX is software for evidence-backed invoice recovery workflows. WolfX is not a law firm, debt collection agency, court, or payment processor. This site provides general information, not legal advice.

Sources

Frequently asked questions

Is a Letter Before Action legally required?

There is no single statute that says you must send one, but the courts expect parties to try to resolve a dispute before issuing a claim. For individual and sole-trader debtors the Pre-Action Protocol for Debt Claims expects a letter of claim, and for company debtors the Practice Direction on Pre-Action Conduct applies. Sending a clear LBA shows you have followed that expected conduct.

How long does a debtor have to respond to an LBA?

It depends on the debtor. For a limited company under the Practice Direction on Pre-Action Conduct there is no fixed period, but a reasonable deadline — commonly at least 14 days — is typical. For an individual or sole trader, the Pre-Action Protocol for Debt Claims generally allows 30 days to respond before you start a claim.

Can I send a Letter Before Action myself?

Yes. A business can send its own Letter Before Action. WolfX helps you prepare an evidence-backed draft from your records; you, your team, or your solicitor review it before it goes out. WolfX does not provide legal advice — take your own advice if your situation is complex or disputed.

Does WolfX send the letter for me?

No. WolfX helps you prepare and organise the LBA and the supporting evidence, but it does not currently send physical post, file court claims, or collect payments from debtors. Sending the letter and any next step is your decision.

Check whether your overdue invoice is ready for a Letter Before Action.