How to Deal with Late-Paying Customers as a Tradesman

You’ve done the job. Done it well. Left the site tidy. Sent the invoice. And then… nothing. A week passes. Then another. Your phone stays quiet. The money you were counting on to cover materials for the next job, the van payment, the mortgage — it’s just sitting in someone else’s account.

Late-paying customers are one of the most stressful parts of running a trade business in the UK. According to the Federation of Small Businesses, UK small businesses are collectively owed over £23 billion in late payments at any given time. For a sole trader or small outfit, even a single unpaid invoice of £500–£2,000 can knock your cash flow sideways for months.

The good news is that you have real options — legal rights, proven scripts, and practical tools that can help you recover what you’re owed and make sure it happens less often in the future. This guide covers all of it.

Why Late Payments Are So Common in the Trades

Before diving into solutions, it helps to understand why this keeps happening. Most late payments fall into one of four categories:

• Genuinely forgot — The customer fully intends to pay but it slipped their mind. A single reminder usually fixes this.
• Cash flow problems on their end — A domestic client had an unexpected bill, or a small commercial client is waiting on their own customer to pay them. Often resolved with a payment plan.
• Unhappy with the work — They’re using the payment as leverage for a dispute. Needs careful handling (more on this below).
• Never intended to pay — The worst case. Rare, but it happens. These need escalation.

Knowing which category you’re dealing with shapes how you respond. Start friendly and professional — most situations are solved without any drama.

Your Legal Rights as a UK Tradesman

Before you chase a penny, it helps to know the law is on your side. UK tradespeople have strong protections when it comes to late payments — many just don’t know about them.

The Late Payment of Commercial Debts Act 1998

If you’re dealing with a business client (another company or sole trader), the Late Payment of Commercial Debts (Interest) Act 1998 gives you the automatic right to charge interest once an invoice becomes overdue. You don’t need to write this into your contract — it applies by law.

The rate is 8% above the Bank of England base rate — which in mid-2026 puts statutory interest at around 13% per year. That compounds daily, so on a £1,000 invoice that’s been unpaid for 60 days, you’re entitled to charge roughly £21 in interest alone.

Fixed Debt Recovery Compensation

On top of the interest, you can also claim fixed compensation for the cost of recovering the debt:

• £40 on invoices under £1,000
• £70 on invoices between £1,000 and £9,999
• £100 on invoices of £10,000 or more

This can be added to your Letter Before Action when you’re escalating the chase. It shows the customer you know your rights and are serious about pursuing the debt.

The Small Claims Court

For disputes up to £10,000 in England and Wales (£5,000 in Scotland, £3,000 in Northern Ireland), the Small Claims Court process is designed to be straightforward enough to use without a solicitor. Filing fees start from £35 and if you win, the court will typically order the defendant to pay those fees back to you. You can file online at GOV.UK in under 30 minutes.

Prevention Is Better Than the Chase

The best way to deal with late payment is to make it structurally difficult for it to happen. Most successful tradespeople follow a few simple habits that dramatically reduce the number of invoices they ever have to chase.

Start With a Professional Written Quote

A verbal agreement is almost impossible to enforce. A clear, written quote sets out what the job involves, what it costs, and what your payment terms are — before a single tool leaves the van. If a customer disputes the charge later, you have something to point to.

A professional PDF quote with your business name, job breakdown, and payment terms looks credible and is taken more seriously than a WhatsApp message with a number in it. See our guide on why professional quotes win more jobs.

Take a Deposit Before You Start

This is the single most effective protection against non-payment. Asking for 25–30% upfront means that even if a client turns difficult at the end, you’re not walking away with nothing. It also filters out timewasters — a customer who refuses a reasonable deposit request is often one who was never planning to pay in full.

Be matter-of-fact about it: “We ask for a 25% deposit before starting, which covers materials. The balance is due on completion.” Most customers accept this without question.

Set Clear Payment Terms on Every Quote and Invoice

Don’t leave it vague. “Payment within 7 days of completion” is better than “payment due on receipt” — it sets a specific deadline rather than an ambiguous moment. For larger jobs, staged payments work well: 25% upfront, 50% at the halfway point, 25% on completion. See our invoicing tips guide for the full breakdown of what to include.

Invoice on the Day the Job Finishes

The longer you wait to invoice, the more time the customer has to forget, deprioritise, or start questioning the work. Send your invoice while you’re still on site — or at the very latest that same evening. The urgency of a job is highest the moment it’s completed. Capitalise on that.

How to Chase a Late Payment: Step by Step

So the due date has passed. Here’s a structured approach that’s professional, firm, and gives you the best chance of getting paid without burning the relationship.

1 The Friendly Nudge (Days 1–7 Overdue)

Start with the assumption that they simply forgot. A short, friendly message via WhatsApp or text is often all it takes. Keep it light — no accusation, no frustration in the tone. You’re just flagging that the invoice is due.

2 The Formal Reminder (Days 8–14 Overdue)

No reply or no payment after your first message? Move to a more formal follow-up. This time, reference the overdue amount clearly and add a short deadline.

This is also a good moment to try a phone call. Hearing a real voice often prompts faster action than a written message, and it gives you a chance to understand if there’s a genuine dispute or cash flow issue on their end.

3 The Letter Before Action (Days 15–30 Overdue)

If you’re still waiting after two weeks, it’s time to send a formal Letter Before Action (LBA). This is a written notice that gives the customer a final deadline — typically 14 days — before you take legal action. It doesn’t cost anything to send, but it has a surprisingly strong effect on the payment rate.

Your LBA should include:

• The outstanding amount
• The invoice number and original due date
• A clear statement that you intend to pursue the debt through the courts if unpaid by the stated deadline
• A reference to statutory interest and compensation you are now entitled to claim under the Late Payment of Commercial Debts Act (for B2B)

Send it by email (so you have a timestamp) and, for larger amounts, by first-class recorded post as well.

4 Escalation (30+ Days Overdue)

At this point you have three realistic options, depending on the amount and your appetite for pursuing it:

• Small Claims Court: Suitable for amounts under £10,000. File online at GOV.UK. Cost: £35–£455 depending on the claim size. Fast, straightforward, and no solicitor needed.
• Debt collection agency: They chase on your behalf, usually taking 10–25% of the recovered amount as their fee. Lower effort on your part, but you get less back.
• Write it off and learn from it: For very small amounts where the cost of pursuing is higher than the debt, sometimes it’s better to chalk it up as experience, blacklist the customer, and put better protections in place going forward.

Red Flags to Spot Before You Start a Job

The easiest late payment to deal with is one that never happens. Over time, most experienced tradesmen develop an instinct for customers who are likely to be a problem. Here are the warning signs that should make you insist on a deposit — or walk away entirely:

• They ask you to “just do it and bill me later” without discussing terms
• They haggle aggressively on price before the job and want to pay as little upfront as possible
• They’ve “had problems” with other tradesmen — a pattern worth questioning
• They can’t confirm when they’re available or are vague about the property (especially for rental properties or recently inherited homes)
• No written record anywhere — they’re only willing to communicate verbally
• They push back on a deposit when you ask for one

Trust your gut. If something feels off before a job starts, it often is. A respectful “We always take a deposit to cover materials before we start” is a reasonable position — and most genuine customers will have no problem with it.

The Long-Term Fix: Better Systems

Chasing individual invoices is exhausting. The real solution is building systems that make late payment rare in the first place: professional written quotes that include payment terms, deposits taken upfront, invoices sent immediately on completion, and a clear payment trail you can reference at any time.

Tradesmen who use professional quoting and invoicing software report significantly fewer payment disputes — partly because everything is documented, and partly because the professionalism signals that you’re a business that takes these things seriously. A detailed, branded invoice with a due date and bank details is taken far more seriously than a quick text with a number on it.

If you’re still sending quotes via WhatsApp or writing invoices by hand, it’s worth looking at the best apps for self-employed tradesmen and the best quoting software for UK tradesmen to find a system that works for your business.

Frequently Asked Questions