What to Do When a Client Doesn't Pay Your Invoice

Your first move should always be a friendly, low-pressure reminder. Keep the tone warm and assume good faith — because statistically, that's probably correct. Something like “Just checking in on invoice #42 — let me know if you have any questions” is enough. You're not accusing them of anything; you're just putting the invoice back in front of them.

Send this reminder 1–3 days after the due date, not on the due date itself. Sending too early can feel presumptuous; waiting too long trains clients that your deadlines are suggestions. If you have a tool like RemindFox, this email goes out automatically — you don't have to write it yourself or remember to send it.

If you haven't heard anything after your first nudge, it's time to be a little more direct. This doesn't mean aggressive — it means clear. Reference the original invoice number, the amount, and the due date explicitly. Add a specific payment deadline: “I'd appreciate payment by Friday, [date].” Specificity helps clients prioritise.

At this stage, it's also worth trying a second channel. If you've only emailed, try a short message on WhatsApp, LinkedIn, or wherever you normally communicate with this client. A lot of invoices get paid the moment the client simply notices them again.

Two or three weeks overdue with no response is when the tone shifts from collaborative to formal. A formal payment notice makes clear that you consider this a serious matter. Include the invoice number, the amount, the original due date, and a new hard deadline — typically 7 days from the notice date. State that you may pursue further action if payment is not received.

Write this on headed paper (or a clearly professional email template) and keep a record of when it was sent. You're building a paper trail now. Many clients who have been ignoring you will pay at this point, because they understand the implication: you're prepared to escalate.

A letter before action (sometimes called a “letter of demand” or “demand letter”) is the final step before formal legal proceedings. It's a written statement that you intend to take legal action unless the debt is settled within a specified period — typically 14 days. In many jurisdictions, this letter is a legal requirement before filing a small claims case.

You can write this letter yourself or use a solicitor for added weight. Keep it factual: the amount owed, the original invoice date, a summary of your previous contact attempts, and the specific action you will take if payment is not received. Sending it via recorded delivery or email with a read receipt gives you proof of delivery.

Small claims court is specifically designed for disputes like this — it's low-cost, doesn't require a solicitor, and is accessible to sole traders and freelancers. In the UK, you can claim up to £10,000 via Money Claim Online (MCOL) for a filing fee starting around £35. In the US, limits vary by state but are typically between $5,000 and $10,000.

The threat of a county court judgment (CCJ) is often enough to prompt payment — a CCJ damages a company's credit rating and can affect their ability to borrow. Before filing, gather every piece of evidence: the original contract or agreement, the invoice, records of all your follow-up attempts, and any responses (or lack thereof) from the client.

It's worth noting that getting to this point is rare. The vast majority of late invoices are resolved at step 1 or 2. The escalation ladder exists for the small minority of cases that genuinely require it.

Research from the Independent Economy Council found that 74% of freelancers don't get paid on time, and 59% are owed $50,000 or more in outstanding invoices. The best way to stay out of those statistics is to never let an invoice drift — which means consistent, timely follow-up from day one.

The best way to handle a non-paying client is to never get into that situation in the first place. RemindFox automates the early stages of this process — the gentle reminder, the follow-up, the firmer nudge — so that invoices rarely reach the formal notice stage. You upload your invoice (PDF, Word file, or image), RemindFox reads it and extracts the key details, and then it sends professionally worded reminder emails on your behalf.

Before each email goes out, there's a 3-hour safety window. If you know the client has already paid, or the situation has changed, you can cancel the send. If everything looks good, it goes out automatically — no awkward writing, no manual scheduling, no forgetting. You choose the tone (Gentle, Standard, or Firm) and RemindFox does the rest.