How to Handle a Customer Who Won't Pay as a Tradesman UK: Letters, Small Claims and Prevention

Non-payment is one of the most stressful situations a self-employed tradesman faces. Whether it is a customer disputing the invoice, going silent after the job, or outright refusing to pay, the outcome hits your cash flow and your livelihood directly. The problem is more common than it should be: sole traders and small trade businesses have less leverage than large companies and are often seen as soft targets by customers who want to delay or avoid payment.

The good news is that UK law is firmly on the side of the tradesman when the work has been done and agreed. You have legal tools available, from statutory interest charges under the Late Payment of Commercial Debts Act 1998 to a straightforward online small claims court process that does not require a solicitor. Most payment disputes resolve well before court because customers do not want the permanent mark of a county court judgment (CCJ) on their credit record.

This guide covers the steps to take when a customer does not pay, in order, from the initial chase through to formal legal action. It also covers the prevention side, including how contracts, deposits, and stage payments protect you before problems arise. For a strong foundation on the paperwork side, the guide to writing a tradesman quote and the tradesman contract template guide are worth reading alongside this one.

Step 1: Send a Formal Invoice and Payment Reminder

Before taking any formal action, confirm that you have sent a clear, itemised invoice with your payment terms stated. This sounds obvious, but a surprising number of payment disputes arise because the invoice was not clear about when payment was due, what it was for, or how to pay. A well-structured invoice should include your name and address or business name, your contact details, the customer's name and address, a unique invoice number, a description of the work completed, the amount due, the payment due date, and your bank details for payment.

If you have not set a specific payment due date, 7 days or 14 days from the invoice date is standard for trade work. Some tradesmen use 30 days, which is fine for larger commercial clients but is unnecessarily long for domestic jobs where you have just completed the work and the customer is living in the property. The shorter the payment window, the less time a difficult customer has to come up with reasons to delay.

Once the payment date has passed without payment, send a polite but firm reminder. Do not assume the worst immediately: many non-payment situations at this stage are genuine oversights, particularly with domestic customers who are not used to managing invoices. Send the reminder by email and text, and try to call the customer directly as well. A phone call is often the fastest way to resolve a simple oversight and moves things along much quicker than waiting for email replies.

Keep a clear record of every contact attempt: the date, the method (call, email, text), and what was said or agreed. This record becomes important if the matter escalates to a formal dispute or court claim, as it demonstrates that you gave the customer every reasonable opportunity to pay before taking further action.

If you do not yet have a professional invoicing process, the PDF invoice generator creates clear, professional invoices with all the required fields included. You can also refer to the guide on how to invoice as a sole trader for a complete overview of invoicing requirements.

Step 2: Issue a Formal Late Payment Notice

If a polite reminder does not produce payment within a few days, it is time to escalate to a formal late payment notice. This is a written notice stating that the invoice is overdue, the amount owed, and the statutory interest and debt recovery charges that will now apply to the outstanding balance.

Under the Late Payment of Commercial Debts (Interest) Act 1998, you are legally entitled to charge statutory interest on overdue invoices at 8% above the Bank of England base rate. As of June 2026, with the base rate at approximately 5.25%, that works out to around 13.25% per year on the overdue amount. For a £3,000 invoice, this adds up to roughly £1.09 per day in interest from the day after payment was due. The interest compounds and continues to accrue until the debt is paid.

In addition to interest, you are entitled to a fixed debt recovery fee on top of the outstanding invoice amount. The fee depends on the debt size: £40 for debts under £1,000, £70 for debts between £1,000 and £10,000, and £100 for debts over £10,000. These amounts are set by the legislation and do not require you to justify them.

It is worth noting that the Late Payment Act in its strictest form applies to business-to-business transactions. For domestic customers (consumers rather than businesses), the statutory interest regime is slightly different and governed by the Late Payment of Commercial Debts Regulations 2013 and the Consumer Credit Act. However, you can still include reasonable interest and recovery charges in your terms and conditions for domestic customers. If you do not have explicit terms, the court has discretion to award interest under the County Courts Act 1984 at 8% per year for county court claims.

Send the late payment notice in writing by email and also by post if you have the customer's address. Keep a copy of everything. The goal at this stage is to signal that you know your rights and are taking the matter seriously, without yet threatening court action explicitly. For many customers, the mention of statutory interest and debt recovery fees is enough to prompt payment.

Step 3: Send a Letter Before Action

A letter before action (LBA) is a formal written demand that states clearly what is owed, gives a firm deadline for payment (usually 14 days), and states explicitly that you will pursue the matter through the courts if payment is not received by that date. It is the final step before formal legal proceedings and carries significant weight because it shows you are prepared to follow through.

Most late payment disputes resolve at this stage. Customers who were willing to ignore a polite reminder often respond very differently when they receive something in writing that references court proceedings and a county court judgment. A CCJ remains on a person's credit record for six years and can affect their ability to get a mortgage, a credit card, or even a mobile phone contract. The prospect of that outcome motivates a significant proportion of non-payers to settle quickly.

Your letter before action should include the following: your full name and address, the customer's full name and address, the invoice number and date, the amount owed including any statutory interest accrued to date, a deadline for payment (14 days is standard), a clear statement that you will issue court proceedings without further notice if payment is not received by the deadline, and your preferred payment method.

Send the letter by recorded delivery (Royal Mail Signed For) so you have proof of delivery. Keep a printed copy for yourself. You can also send it by email to create an electronic trail, but the recorded delivery copy is the one that carries legal weight if the matter reaches court and the customer claims they never received it.

You do not need a solicitor to write a letter before action. For smaller debts, writing it yourself is perfectly acceptable. Many templates are available online from government sources and legal aid sites. If the debt is significant (above £5,000), it may be worth having a solicitor draft the letter, as the cost of their time is recoverable if you win a subsequent court case in certain circumstances.

Step 4: Make a Small Claims Court Claim

If the letter before action is ignored or the customer responds but refuses to pay, you can make a claim through the small claims court. In England and Wales, the small claims track covers debts up to £10,000. The process is online at gov.uk/make-court-claim-for-money and is designed to be accessible without a solicitor. In Scotland, the equivalent is the Simple Procedure court for debts up to £5,000. In Northern Ireland, the Small Claims Court covers debts up to £3,000.

To make a claim, you will need the customer's full name and address, the amount you are claiming (including any statutory interest calculated to the claim date), and a brief description of what the debt is for. The online process walks you through this step by step. The court filing fee is added to your claim: it ranges from £35 for claims up to £300 to £455 for claims between £5,000 and £10,000. If you win, these costs are recovered from the defendant along with the debt.

Once filed, the court notifies the customer (the defendant) that a claim has been made. They have 14 days to respond. If they do not respond within that period, you can apply for a default judgment, which is issued without a hearing. If they respond and admit the debt, judgment is entered in your favour. If they dispute the claim, the court will list the matter for a hearing, usually at your local county court, and both parties will be required to attend.

At the hearing, you present your evidence: the original quote, the invoice, any written acceptance of the work by the customer, photos of the completed job, and the communication history showing you tried to resolve the matter informally first. Keep all of this organised and in date order. The judge will hear both sides and make a decision, often on the same day for straightforward small claims.

Once judgment is obtained (whether by default or at a hearing), the customer has a set period to pay, usually 14-28 days. If they still do not pay, there are various enforcement methods available: a warrant of control (a bailiff can attend to take goods), an attachment of earnings order (payments deducted directly from wages), a third-party debt order (funds frozen in a bank account), or a charging order over property they own. Your local county court can advise on the most appropriate enforcement method for the specific situation.

The county court judgment itself is a powerful tool even before enforcement. Most customers pay within the 14-28 day payment period after judgment because the CCJ registers on their credit file as soon as it is issued (if unpaid). If it is paid within one month of the judgment, the CCJ can be removed from the register, which gives customers a strong incentive to settle quickly once judgment has been entered.

Prevention: How to Avoid Non-Payment

The most effective way to handle non-payment is to make it structurally difficult for it to happen in the first place. The following practices, applied consistently, will dramatically reduce the number of payment problems you encounter as a sole trader or small trade business.

Take a deposit before starting any significant job. A deposit of 10 to 30% of the total quote value is standard across most trades and is widely accepted by domestic customers. The deposit serves two purposes: it covers your material costs before you commit to the job, and it signals that the customer is serious about proceeding. Customers who refuse to pay any deposit are disproportionately likely to cause problems at the payment stage. If a customer objects strongly to a deposit, treat that as a warning sign rather than a reason to drop your terms.

Use stage payments on larger jobs. For any job lasting more than a week or involving significant material costs, structure your payment schedule around milestones rather than waiting until completion. A common structure for a medium-sized job is: 20-30% on start, 30% at first fix or midpoint, 30% at practical completion, and 10% on sign-off of any snagging items. This limits your exposure at any one time and keeps the customer engaged in the process. It also means that if a dispute does arise, you are only chasing a portion of the total rather than the entire invoice.

Issue invoices the same day you complete the work. Tradesmen who invoice weeks after completing a job give customers time to find reasons to dispute or delay. If the invoice arrives while the work is still fresh in the customer's mind and they are satisfied with it, payment is far more likely to follow quickly. Delay in invoicing also weakens your legal position slightly, as it can make a debt appear less urgent to both the customer and to a court.

Get sign-off on the work before leaving site. A simple sign-off form, or even a text message from the customer confirming they are happy with the work, is valuable evidence if the customer later tries to dispute payment by claiming the work was unsatisfactory. Take photos of the completed job from multiple angles as a matter of routine, regardless of whether you expect a dispute. A clear photographic record of the finished work removes one of the most common grounds for refusing to pay.

Use a written quote that the customer has explicitly accepted. A written quote that describes the scope of work clearly, including what is and is not included, protects you if the customer later argues that they expected more for the agreed price. The customer should sign or confirm acceptance of the quote before you start. Email confirmation is acceptable and legally valid. For larger jobs, a proper contract is more appropriate. The tradesman contract template guide covers what a basic contract should include and how to present it to customers.

Be selective about which jobs and customers you take on. Avoid jobs where the customer refuses to pay a deposit without a reasonable explanation, has negative reviews online from tradespeople, is evasive about who owns the property, or seems primarily focused on getting the lowest possible price rather than quality work. Not every job is worth taking, and the time and stress spent chasing non-payment on a problem customer often outweighs the value of the invoice.

When to Walk Away from a Debt

Not every unpaid invoice is worth pursuing through the courts. The decision to escalate depends on the size of the debt, the likely cost of recovery, and whether the customer has assets that could actually be recovered against.

For amounts under £200 to £300, the time and cost involved in preparing and filing a small claims court case, attending a hearing, and potentially pursuing enforcement may realistically exceed the value of what you recover. Court filing fees start at £35 for very small claims and rise with the debt amount, and the time you spend preparing paperwork is time you are not earning on jobs. For very small debts, it may be more practical to write off the amount and focus on improving your systems to prevent a repeat.

If the customer has no assets, for example they have recently been made bankrupt or are a limited company that has gone into liquidation, a county court judgment may be unenforceable in practice. A CCJ is only useful if the defendant has income or assets against which it can be enforced. Checking the customer's credit status before spending time on a claim is worthwhile for larger debts: the Insolvency Service register is publicly accessible and free to check.

In cases where the debt is not worth pursuing formally, write it off as a bad debt. Bad debts are an allowable expense against your taxable profit, which means writing off a £500 debt saves you the tax on that £500 (roughly £100 at the basic rate, £200 at the higher rate). It is not the same as getting paid, but it reduces the pain slightly and keeps your accounts accurate.

One avenue that is tempting but should be avoided: posting about the dispute on social media, naming the customer publicly, or leaving negative reviews about the customer on platforms. Doing so opens you up to counter-claims of defamation, which are both stressful and potentially costly. The legal remedy for non-payment is the court system, not public shaming. Keep the process formal and documented, and let the courts do the work if it comes to that.

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