Invoice follow-up emails don’t need to be complicated. They need to be clear, include the right information, and escalate appropriately as time passes. Here are three ready-to-use templates.
Template 1: Polite first reminder (day 1–3 past due)
Subject: Invoice #[number] — payment reminder
Hi [Name],
I hope you’re well. Just a quick note that Invoice #[number] for $[amount] was due on [date] — I wanted to flag it in case it got lost in the shuffle.
If you have any questions about the invoice, I’m happy to help. Otherwise, you can pay via the link below or using the bank details at the bottom.
[Payment link]
Bank details: [Bank name] / Routing: [number] / Account: [number]
Thanks, [Your name]
Why it works: It assumes good faith, includes everything the client needs to pay, and asks nothing of them except to pay. The friendly opener and “in case it got lost” phrasing gives the client a comfortable way to respond.
What to customize: The invoice number, amount, due date, and payment details. Nothing else needs to change.
Template 2: Direct follow-up (day 7–10 past due)
Subject: Following up: Invoice #[number] — $[amount] now [X] days overdue
Hi [Name],
I’m following up on Invoice #[number] for $[amount], which was due on [original date] and is now [X] days past due. I sent a reminder on [date of first email] and haven’t received a response.
If there’s an issue with the invoice — the amount, the scope, or the payment method — I’m glad to sort it out. Otherwise, I’d appreciate payment by [specific date 3–5 days from now].
[Payment link]
Bank details: [Bank name] / Routing: [number] / Account: [number]
Thank you, [Your name]
Why it works: It acknowledges the previous email, opens a door for the client to raise any genuine concerns, and sets a specific new deadline without being aggressive.
The key detail: “I sent a reminder on [date]” documents the follow-up history. This is useful if things escalate further.
Template 3: Formal final notice (day 14–21 past due)
Subject: Final notice: Invoice #[number] — $[amount] — action required by [date]
Dear [Name],
This is a formal notice that Invoice #[number] for $[amount], issued on [invoice date] and due on [due date], remains unpaid. This is the third communication I have sent regarding this invoice.
Payment in full is required by [specific date]. If payment is not received by this date, I will [pause all ongoing work / apply the late fee of [X]% per our agreement and refer this account to a collections service / pursue recovery through small claims court].
I would strongly prefer to resolve this directly. Payment can be made via: [Payment link] [Bank details]
Regards, [Your name]
Why it works: The formal tone, documented history (“third communication”), and stated consequence together signal this is serious without being unprofessional. It also gives the client a last clear opportunity to pay before things escalate.
Only include consequences you’ll actually act on. If you’re not going to collections, don’t say you are. An empty threat in a final notice damages your credibility.
A note on subject lines
Subject line choice matters more on invoice follow-ups than on most emails. A few principles:
- Include the invoice number in every subject line — it makes it easy for clients to search and find the thread
- Include the dollar amount in the second and third emails — specificity creates urgency
- Use words like “final notice” or “action required” only in the last email — overuse dilutes their effect
First email: Invoice #2026-047 — payment reminder
Second email: Following up: Invoice #2026-047, $1,800 outstanding
Third email: Final notice: Invoice #2026-047 — payment required by June 10
Timing matters as much as wording
The templates work best at the right intervals. Too soon, and you seem impatient. Too late, and the invoice gets further from the client’s mental to-do list.
Send the first reminder on the first or second business day after the due date. Wait five to seven more days before the second. Wait another five to ten before the third. Give the client a real chance to respond at each stage before escalating.
The best follow-up email is the one that includes a payment link. Every obstacle you remove makes it more likely the invoice gets paid.
For freelancers sending invoices through tools like Waco, the first reminder goes out automatically — which means you only need to write the second and third emails yourself if the automated reminder doesn’t work.
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