Few things drain a small business like work done and money not paid. Late payments are consistently one of the biggest causes of cash flow trouble for UK firms, and they hit hardest exactly where there is least slack — the smallest businesses. The reassuring news is that chasing overdue invoices is a skill, not a confrontation, and being polite and firm at the same time is entirely possible.
This is general information, not legal advice. Rules on late-payment interest and court action change, so confirm the current position on GOV.UK or with an adviser before acting.
Why chasing is normal, not rude
First, reframe the task. Asking to be paid for work you have completed is not impolite, awkward or aggressive — it is basic business. The discomfort many founders feel is misplaced; a customer who has had your goods or services owes you, and a professional reminder simply states that fact. Treating prompt collection as routine, rather than a favour you are nervous to request, is the single biggest mindset shift.
Late payment also matters far beyond the individual invoice, because it directly undermines your cash flow management. A profitable business can still fail if the cash arrives too late to pay wages, suppliers or tax. Chasing is not pettiness; it is protecting the thing that keeps the lights on.
Prevent before you chase
The best collection strategy is to need it less. Several habits cut lateness before it starts:
- Agree clear payment terms up front, in writing — for example, payment within a set number of days of invoice — so there is no ambiguity later.
- Invoice promptly and accurately. A late or wrong invoice invites a late payment. Make sure each one shows what was supplied, the amount, the due date and exactly how to pay.
- Make paying easy. Offer the payment methods your customers actually use; friction delays money.
- Check new customers where the order is large. A quick credit check can flag a risky payer before you extend terms.
- Confirm receipt. A short note acknowledging an order, with the terms restated, sets expectations early.
Getting your pricing and terms right at the outset is part of the same discipline; our guide to pricing your product covers building healthy margins and clear terms that make collection easier.
A staged approach to chasing
When an invoice does go overdue, escalate in calm, predictable steps. Each stage stays professional and on the record.
- The friendly reminder (day after due date). A short, warm message: "Just a quick note that invoice 1042 was due yesterday — could you let me know when it will be paid? Happy to resend if helpful." Most late payments are oversights, and this clears them.
- The firm follow-up (about a week later). Reference the previous message, restate the amount and due date, and ask for a specific payment date. Polite, but unmistakably expecting action.
- The formal notice (a week or two on). A clearly headed reminder stating the invoice is significantly overdue, that payment is now required, and that you may apply statutory interest and compensation. Keep the tone businesslike, not threatening.
- The phone call. A direct, courteous call often unblocks what emails cannot, especially if there is a query you can resolve.
Consistency is what makes chasing work. Customers quickly learn whether a supplier follows up — and they tend to pay the ones who do, first.
Your legal rights on late commercial payments
UK businesses are not powerless. For most business-to-business transactions, the law gives you a statutory right to claim interest on overdue invoices and a fixed sum in compensation for the cost of recovering the debt, and you can also claim reasonable recovery costs above that fixed amount. The exact rates and thresholds are set in law and can change, so confirm the current figures on GOV.UK.
You do not have to apply these charges, and many businesses use them mainly as leverage — stating in your terms that statutory interest may be applied is often enough to focus a slow payer's mind. If you do apply them, set it out clearly and professionally; the aim is to recover what you are owed, not to start a fight.
When a customer simply will not pay
Most invoices are resolved long before this point, but for persistent non-payers there is a clear path:
| Step | What it involves |
|---|---|
| Letter before action | A formal final notice warning of court proceedings by a set date |
| Mediation | A neutral third party helping both sides reach agreement |
| Small claims | A court process designed to be accessible for lower-value debts |
A letter before action is often the turning point: a clear, dated warning that you will issue a court claim if payment is not made frequently prompts settlement on its own. It is also normally expected before you go to court. If you do proceed, the small claims track is designed to be usable without a solicitor for lower-value amounts — but weigh the time, any fees and the customer relationship first. Citizens Advice and GOV.UK both set out the steps for making a court claim for money.
Keep records throughout
Whatever stage you reach, document everything: the original agreement and terms, the invoice, every reminder with its date, and any replies or promises to pay. A clean paper trail protects you if a dispute escalates, and it is exactly the kind of organised record-keeping that good bookkeeping gives you anyway. If you ever need a letter before action or a court claim, that history is your evidence.
The bottom line
Chasing late payments is a normal, necessary part of running a business, and you can do it politely and firmly. Prevent lateness with clear terms, prompt accurate invoicing and easy payment; chase early and consistently when it happens; and escalate in calm, professional stages. Remember that UK law backs you with the right to claim interest and compensation on late commercial payments, and that a letter before action often resolves even stubborn cases. Protecting your cash flow is not awkward — it is one of the most important jobs you have.