Letter Before Action: What It Is and How to Write One in the UK

A letter before action is the formal letter you send to a debtor before starting a court claim. It sets out what is owed, why it is owed and the date by which you expect payment. If you are chasing an unpaid invoice, it is usually the last step before court, and getting it right protects both your claim and your costs.

This guide explains what a letter before action must contain, which pre-action rules apply, how long to give the debtor and what to do next. It is written for business owners in Manchester and across the UK who are owed money.

What Is a Letter Before Action?

A letter before action is a formal written demand for payment that warns the debtor you will issue court proceedings if the debt is not paid, or a sensible proposal is not made. You will also see it called a letter of claim or a letter before claim. In practice the terms mean the same thing.

It does three jobs. It tells the debtor exactly what you say they owe. It gives them a fair chance to pay, dispute the debt or propose a payment plan. And it shows a court later that you tried to resolve matters first. Many debtors pay once a clear letter arrives, because the next step is a county court claim, with costs and a possible judgment against them.

Is a Letter Before Action Legally Required?

No rule makes a claim invalid simply because no letter was sent. The practical position is different. The Civil Procedure Rules expect parties to follow pre-action steps before litigation, and a court can take your conduct into account when deciding who pays the costs. If you skip the letter, or send one that ignores the rules, the court can penalise you on costs even if you win the claim.

That makes the letter more than a formality. It is your evidence that you acted reasonably, and it is worth taking time over.

Which Pre-Action Rules Apply?

Which rules apply depends on who owes you the money.

If the debtor is an individual or sole trader

The Pre-Action Protocol for Debt Claims applies where a business is claiming a debt from an individual, including a sole trader. It is detailed. Your letter of claim must give up-to-date details of the debt, and you must enclose an information sheet, a reply form and a financial statement form, together with copies of key documents such as the agreement and a statement of account. The debtor has 30 days to respond. If they return the reply form, you must wait a further 30 days before starting proceedings, and you must allow extra time if they ask for more information or for time to get debt advice.

If the debtor is a limited company, LLP or partnership

Business to business debts, apart from those owed by sole traders, fall outside the Debt Claims Protocol. The Practice Direction on Pre-Action Conduct and Protocols applies instead. It is less prescriptive, but it still expects a clear letter of claim, enough information for the debtor to understand and respond to the claim, and a reasonable time to reply. Where no specific protocol applies, that is the standard to follow.

What to Include in a Letter Before Action

A good letter is clear enough that the debtor cannot say they did not understand it. Include the following.

• Your full name and address, and the debtor’s, using the registered name and address for a company.

• Why the money is owed: the contract, the invoice numbers and dates, and the goods or services supplied.

• The exact amount, with interest and any fixed recovery costs shown separately and calculated.

• The date the payment became due and your payment terms.

• A clear deadline for payment and how to pay, with bank details and a contact point.

• What you will do if there is no payment or proposal by that date.

• Copies of the contract, invoices and a statement of account, plus the information sheet, reply form and financial statement form where the Debt Claims Protocol applies.

Keep the tone firm and factual. A judge may read the letter later, so leave out anything you could not stand behind.

How Long Should You Give the Debtor to Reply?

For individuals and sole traders, the answer is fixed: 30 days under the Debt Claims Protocol. For other business debts, the practice direction expects a reasonable time. Many creditors allow 14 days for a straightforward unpaid invoice, and longer where the issues are complex, or the sum is large. Whatever period you choose, state it as a date rather than a number of days, so there is no argument about when it ends.

Interest and Compensation on Late Payment

If another business owes you for goods or services, you can usually add statutory interest and a fixed sum for recovery costs under the Late Payment of Commercial Debts (Interest) Act 1998. Statutory interest is 8% above the Bank of England base rate. You cannot claim it if your contract sets a different rate for late payment, so check your terms first and rely on one basis, not both. Our business contract drafting advice covers late payment clauses.

The fixed sum is £40 for debts up to £999.99, £70 for debts of £1,000 to £9,999.99 and £100 for debts of £10,000 or more. You can claim it once for each late payment. If no payment date was agreed, payment is late 30 days after the customer receives the invoice or you deliver the goods or services, whichever is later. Interest cannot normally be claimed where an invoice was paid late because of a genuine dispute.

Here is a worked example, using a base rate of 4% for illustration only. An invoice for £5,000 is 40 days late. Statutory interest is 12% a year, which is £600, or about £1.64 a day. Over 40 days that comes to about £65.75. Add the £70 fixed sum and you can claim about £135.75 on top of the invoice. Show your working in the letter, including the rate, the start date and the daily amount, because overstated figures damage your credibility.

How to Send the Letter and Keep Proof

Send it by first class or recorded post to the debtor’s last known address and keep proof of posting. Send it by email as well where your contract allows notices by email, or the debtor has used that address for business. Keep a copy of the letter, every enclosure and the proof of sending in one place. If the matter reaches a court, you will need to show when the letter went and what it contained.

What Happens After You Send It?

The debtor usually does one of four things.

• Pays in full. Confirm receipt in writing and close the matter.

• Proposes instalments. Weigh the offer, and put any agreed plan in writing, including what happens if a payment is missed.

• Disputes the debt. Ask for their reasons and evidence, then review your own paperwork. Many genuine disputes settle through negotiation or alternative dispute resolution such as mediation.

• Ignores the letter. Once your deadline passes, the next step is a county court claim. If the debtor does not respond to the claim, you can usually ask the court for a default judgment.

Court proceedings are handled by appropriately regulated litigation professionals, not by MAR Legal.

The Time Limit: A Letter Does Not Stop the Clock

Most simple contract debts, including unpaid invoices, can only be pursued in court within six years under the Limitation Act 1980, usually counted from the date payment fell due. Sending a letter does not stop that clock. Issuing a claim does. If an old invoice is approaching six years, deal with it first. Part payment, or a written acknowledgement of the debt from the debtor, can restart the period.

Letter Before Action, Statutory Demand or Court Claim?

Where a debt is clear, due and undisputed, there are three common routes. A letter before action is the lower-cost first step and is often enough. A statutory demand is a formal notice under the Insolvency Act 1986 that gives the debtor 21 days to pay or agree terms before you can apply to bankrupt an individual or wind up a company. It is not suitable where the debt is genuinely disputed. A court claim is how a disputed or unpaid debt is decided, and a judgment is obtained.

If the relationship matters and the invoice is only recently overdue, a polite payment reminder before any of these is a sensible first move.

Common Mistakes with Letters Before Action

• Vague amounts or missing evidence, so the debtor can claim not to understand the demand.

• Using the wrong rules or giving too short a deadline, especially for a sole trader.

• Overclaiming interest or claiming both contractual and statutory interest.

• An aggressive tone that reads badly if a judge sees the letter later.

• Ignoring a genuine dispute or a reasonable instalment offer.

• Going straight to court without a letter.

If You Have Received a Letter Before Action

Do not ignore it. Reply within the deadline and say whether you admit the debt, dispute it or have a counterclaim. If you dispute it, send the documents that support your position. If you are an individual, the reply form lets you ask for more information, time to get debt advice or time to pay. Ignoring a letter usually leads to a court claim and, for a company, can lead to a winding-up petition.

Final Thought

A letter before action works best when the facts are clear, and the figures are right. Gather the evidence, use the correct rules for your debtor and give a fair deadline. Done properly, it often settles the debt, and where it does not, it puts you in a stronger position.