How to Follow Up on an Unpaid Invoice (Email Scripts)

Most unpaid invoices aren't refusals — they're oversights that just need a nudge. The key is a calm, consistent cadence: a gentle reminder, then progressively firmer follow-ups, each making it easy to pay. This guide gives you that cadence plus four copy-paste email scripts, from a friendly pre-due reminder to a final notice, so you can chase payment professionally without damaging the relationship.

Keeping a clear, numbered invoice in the first place makes follow-up easier — create yours in the invoice generator.

The follow-up cadence that works

A predictable rhythm beats waiting anxiously and then firing off an angry email. A proven cadence:

1. 3–5 days before the due date — a friendly heads-up.
2. On the due date — a polite "due today" note.
3. ~7 days overdue — a firmer reminder.
4. ~14 days overdue — a direct follow-up referencing terms.
5. ~30 days overdue — a final notice before escalation.

Keep every message professional and make paying effortless each time. If email goes unanswered after two tries, a quick phone call often works — some people are "email-blind" but respond instantly to a call.

Before you chase: quick checks

Before sending a reminder, confirm the basics so you don't chase in error:

• The invoice was actually sent to the right contact and received.
• The due date has genuinely passed.
• There's no dispute you've missed about the work or amount.

A misdirected invoice is the most common reason for "non-payment" — verify it landed before escalating.

Script 1 — Friendly reminder (before / on due date)

Subject: Reminder: Invoice #2026-014 due 18 Jul

Hi [Name],

Just a friendly reminder that invoice #2026-014 for $1,200 is due on 18 July. The invoice is attached again for convenience.

You can pay by [method]. Let me know if you need anything from me.

Thanks, [Your Name]

Script 2 — First follow-up (~7 days overdue)

Subject: Invoice #2026-014 — now past due

Hi [Name],

I wanted to check in on invoice #2026-014 for $1,200, which was due on 18 July and is now a week overdue. I've reattached it here.

If it's already on its way, thank you — please ignore this. If not, could you let me know when I can expect payment?

Appreciate your help, [Your Name]

Script 3 — Firmer follow-up (~14 days overdue)

Subject: Second reminder: Invoice #2026-014 (14 days overdue)

Hi [Name],

Invoice #2026-014 for $1,200 is now 14 days past its 18 July due date, and I haven't yet received payment or an update.

Per the agreed terms, [note any late fee if applicable]. Could you confirm the payment date, or let me know if there's an issue I can help resolve?

Thanks, [Your Name]

Script 4 — Final notice (~30 days overdue)

Subject: Final notice: Invoice #2026-014 (30 days overdue)

Hi [Name],

Despite previous reminders, invoice #2026-014 for $1,200 remains unpaid 30 days after its due date. Please arrange payment by [date].

If payment isn't received by then, I'll have to [pause work / apply the agreed late fee / escalate to collections]. I'd much rather resolve this directly — please get in touch.

Regards, [Your Name]

Tips that make follow-ups work

• Reattach the invoice every time — remove any excuse about not having it.
• Stay calm and factual. Firm is fine; hostile isn't, and it rarely speeds payment.
• Escalate gradually. Each message can be a little firmer than the last.
• Offer a way out. If the client is struggling, a payment plan may recover the money faster than a standoff.
• Switch channels after two unanswered emails — a brief "checking on invoice #2026-014" call is perfectly appropriate.

When to escalate further

If a final notice goes unanswered after ~30–60 days, options include a formal demand letter, a collections agency, or (for larger amounts) legal routes like small-claims. Prevention helps most: clear terms, deposits on big jobs, and prompt invoicing reduce how often you reach this point. See how to get paid faster.

Related reading

• How to Add Late Fees to an Invoice
• How to Send an Invoice by Email (+ Templates)
• How to Write Payment Terms (Net 30, Due on Receipt)

FAQ

How do I follow up on an unpaid invoice? Use a calm, consistent cadence: a friendly reminder before or on the due date, a firmer follow-up around 7 days overdue, a direct reminder referencing terms at about 14 days, and a final notice around 30 days. Reattach the invoice each time and make paying easy.

What should an overdue invoice email say? State the invoice number, the amount, and the original due date; reattach the invoice; and ask for a clear payment date. Keep the tone professional and factual, and note any agreed late fee. Give the client an easy way to pay or to raise any issue.

How long should I wait before chasing an unpaid invoice? Send a gentle reminder around the due date, then follow up roughly a week after it passes. From there, escalate at about 14 and 30 days overdue. First, confirm the invoice reached the right contact — a misdirected invoice is a common reason for non-payment.

When should I call instead of email about an unpaid invoice? After about two unanswered emails. Some clients overlook email but respond immediately to a brief, polite phone call — "just checking on invoice #2026-014." A call can also surface any dispute or cash-flow issue you can help resolve.

What if a client still won't pay? If a final notice goes unanswered after around 30–60 days, options include a formal demand letter, a collections agency, or small-claims for larger amounts. Offering a payment plan can also recover the money faster than a standoff. Clear terms and deposits reduce how often it comes to this.