How to Chase a Late Invoice Without Damaging the Relationship

Chase on a schedule, not on a feeling

Late payment is emotionally awkward, which is exactly why most small businesses chase too late and too apologetically. You worry about damaging the relationship, so you wait a few extra days, send a soft email, and then wait again. Deciding your chasing schedule in advance — before anything is actually overdue — removes the decision from the moment you feel most reluctant to make it.

A simple, escalating structure works for the vast majority of small business debts: a friendly reminder a few days before the due date, a firm note on the due date, a clear follow-up a week later, and a formal notice with a final date if it runs past that. By treating it as a process rather than a personal confrontation, you maintain professionalism while making it clear that you expect to be paid.

• 3 days before due: A friendly reminder that payment is coming up, checking they have everything they need.
• On the due date: A brief note stating the invoice is due today and asking for confirmation of payment.
• 7 days overdue: A firmer message. Restate the amount, attach the original invoice again, and ask for a specific payment date.
• 14–21 days overdue: A formal notice referencing the original terms, restating the amount, and giving a final date before further steps (such as applying statutory interest or seeking recovery) are taken.

Statutory interest on late commercial payments

Under the Late Payment of Commercial Debts (Interest) Act 1998, UK businesses generally have a right to charge interest on overdue business-to-business invoices, along with a fixed compensation sum to cover recovery costs, where no different payment term was agreed in the contract. The statutory interest rate is linked to the Bank of England base rate plus a set margin (currently 8%), and the compensation amount depends on the size of the debt (£40 for debts under £1,000, up to £100 for debts of £10,000 or more).

In practice, most small businesses use the right to charge statutory interest sparingly. It is often used as leverage — mentioned in a final chasing message to prompt action — rather than something routinely applied to every invoice that is two days late, because aggressively applying it can damage an ongoing commercial relationship. Whether and how to apply it depends heavily on your contract terms and the specifics of the debt. If a customer disputes the debt or the amount is significant, you should seek professional advice rather than relying on a general guide.

What to say, and what to avoid

Keep your chasing messages short, factual, and entirely free of apology. State the invoice number, the amount, the original due date, and exactly what you need from them — either immediate payment, or a confirmed date when payment will be made. Avoid long explanations of why you need the money (e.g., 'I have my own bills to pay'). Your cash flow situation is not relevant to whether the debt is owed, and mentioning it can make you sound desperate rather than professional.

Phone calls can work extremely well for a first friendly nudge, as it is harder for a customer to ignore a voice than an email. However, always follow up anything agreed on a call with a written message. If they promise to pay by Friday, email them immediately saying, 'Thanks for the chat, confirming you will process payment for invoice 104 by this Friday.' This creates a clear paper trail if the dispute escalates.

When to stop chasing yourself

If a customer goes completely silent after a formal notice, or disputes an invoice with no clear or logical reason, continuing to send the exact same chasing email every week rarely changes the outcome. You are just training them to ignore you.

That is the point where you must consider escalating. Options include a formal 'Letter Before Action' from a solicitor, engaging a commercial debt recovery service, or — for a straightforward, undisputed amount under £10,000 — using the government's Money Claim Online (Small Claims Court) process. Knowing when to hand the problem over saves you time and emotional energy.

What to do, in order

1. 1

   Send a friendly reminder before the due date

   Three days before the invoice is due, send a quick note checking they have everything they need to process the payment.

2. 2

   Note the due date firmly

   If payment doesn't arrive on the day, send a brief, professional message asking for confirmation that it has been sent.

3. 3

   Escalate to a firm follow-up

   One week overdue, send a firmer message restating the amount and attaching the original invoice again.

4. 4

   Issue a formal notice

   Two to three weeks overdue, send a formal notice giving a final payment date and mentioning your right to claim statutory interest.

5. 5

   Stop chasing and escalate

   If you hit your final date with no payment or credible plan, hand the debt to a solicitor or a recovery service. Your time is better spent elsewhere.