A late-invoice follow-up sequence that keeps the client

A late payment is often not a refusal

Before assuming the worst: invoices sit unpaid because they went to the wrong address, because a purchase order number is missing, because the person who approves them is on holiday, or because the finance team pays everything on the 30th regardless of what your invoice says.

Often the client has not decided not to pay. They simply have not done it yet. A sequence works because it escalates on a schedule, so you never have to decide in the moment how annoyed to sound.

Write the sequence once and follow it for every client. That is the whole method.

Step 1: friendly reminder, 1 to 3 days after the due date

Assume it slipped. Attach the invoice again, since making someone search their inbox is how another week passes.

Subject: Invoice 2026-014 for €1,200: quick reminder

Hi Marc,

Just a reminder that invoice 2026-014 for €1,200, due on 28 August, is still showing as unpaid on my side. I have attached it again in case it got lost.

You can pay by bank transfer or the payment link on the invoice. If it is already on its way, please ignore this.

Thanks!

Léa

No apology, no "sorry to bother you". You are not bothering anyone. You are providing information.

Step 2: firm follow-up, 7 to 10 days later

The tone changes here: still warm, but now you ask for something specific.

Subject: Overdue: invoice 2026-014 (€1,200, due 28 August)

Hi Marc,

I am following up on invoice 2026-014 for €1,200, which was due on 28 August and is now 13 days overdue. I have not had a reply to my reminder of 31 August.

Could you let me know the date the payment will be made, by Monday? If something is holding it up, such as a missing PO number or the wrong billing details, tell me and I will sort it out straight away.

The invoice is attached. You can pay by bank transfer or the payment link on the invoice.

Léa

Two things do the work: a request for a specific date, and an offer to fix the blocker. "When can I expect payment?" is much harder to leave unanswered than "just checking in".

Step 3: a 60-second phone call, between steps 2 and 4

If you have a number, use it. A one-minute call can settle what two weeks of email did not.

1. "Hi Marc, it's Léa. Quick call about invoice 2026-014. Is now a good moment?"
2. "It was due on 28 August, for €1,200. Is anything blocking it on your side?"
3. Listen. If there is something you can fix right now, fix it while you are on the phone.
4. "What date can I expect the payment?" Wait for an actual date.
5. "Great, I will send a short email confirming that date." Then send it.

That last step matters. The email is polite, and it is also a written record.

Step 4: final notice, 7 to 10 days after step 2

Formal, short, and specific about what happens next.

Subject: Final notice: invoice 2026-014 (€1,200) overdue since 28 August

Hello Marc,

Invoice 2026-014 for €1,200, due on 28 August, remains unpaid after my reminders of 31 August and 10 September.

Please arrange payment by 24 September. If payment is not received by then, I will pause the remaining work on the project, as set out in our agreement.

I would much rather resolve this directly. If there is an issue, reply today or call me on [number].

The invoice is attached. You can pay by bank transfer or the payment link on the invoice.

Léa

Only threaten what your contract actually allows

This is the part to get right. Do not mention late fees, interest, pausing work, or "formal recovery" unless your agreement or your local law genuinely gives you that right. An empty threat that the client's accountant recognises as empty costs you the leverage you had.

Late-payment rules differ by country, and many places set statutory interest or compensation for business-to-business invoices. In the EU, for example, a business that pays another business late generally owes late-payment interest plus at least €40 towards recovery costs (Directive 2011/7/EU). Check what applies where you work, and put it in your terms before the next project rather than inventing it mid-chase.

Prevent the next one

Three lines in your scope of work make the next one less likely:

• A deposit before work starts. Clients who have paid something behave differently from clients who have paid nothing.
• Payment terms in writing, with the due window, the method, and what happens when payment is late.
• Billing details collected at kick-off: legal entity name, invoicing email, PO number, VAT number. An invoice sent to one person instead of the accounts inbox can sit unseen while that person is away.

When to stop

If the final notice passes with no reply, the decision is commercial, not emotional: the amount, the evidence you have, and whether you would work with them again. In many countries a formal payment demand letter is a cheap next step, and small-claims procedures exist for exactly this. Get advice for your situation rather than acting on a forum post, including this one.

What you should not do is keep working. Unpaid work plus more unpaid work is not a strategy.

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General information, not legal advice: check the late-payment rules that apply where you work.

This article was written with Claude, an AI assistant, and checked for accuracy before publishing. Not affiliated with or endorsed by Anthropic.