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Overdue Invoice Email Templates (Friendly, Firm, Final)
You do not need a new sentence for every overdue invoice. You need three good messages, one for each step, that you can copy, fill in, and send. These overdue invoice email templates follow the same sequence PaidUp sends by email: friendly, firm, then final. Each one includes the invoice number, amount, and due date, because a customer should never have to reply to ask what they owe.
How to use these templates
Replace every placeholder in square brackets with your own details before you send. Keep the subject line short, and put the invoice number and amount in it, so the customer can see what the message is about without opening it. Send the friendly template first, the firm template a week later if the invoice is still unpaid, and the final template after two weeks. Do not skip ahead. A steady sequence is easier for the customer to follow, and it is fairer than jumping straight to a final notice.
Every template below is written for email. PaidUp sends reminders by email only, and these messages are written to work in that format: short, clear, and easy to read on a phone.
Template 1: Friendly reminder
Send this one day after the due date, or a day or two before the due date if you want to prevent the invoice going late at all. The tone is polite, and the assumption is that the customer simply forgot. Use it for first reminders, and for customers who usually pay on time.
Subject line: Friendly reminder, invoice [invoice number] for [amount]
Why it works: it is short, it gives the customer everything they need to pay, and it gives them an easy way to tell you about a problem. Most late invoices are collected at this step.
Template 2: Firm follow-up
Send this 7 days after the due date, if the invoice is still unpaid. The tone is still professional, but the message is clearer about what you expect and when you expect it. Give a specific payment date, not just a request to pay soon.
Subject line: Invoice [invoice number] now 7 days overdue, [amount]
Why it works: it states the facts, it sets a date, and it still leaves room for the customer to raise a genuine problem. A firm message is clear, not angry, and clarity is what gets a payment date agreed.
Template 3: Final notice
Send this 14 days after the due date, if the invoice is still unpaid. State plainly that this is the final notice, give a payment deadline, and say what happens next. For many trades, that means pausing further work until the balance is paid. Say it in writing, before you pause, so the customer is never surprised.
Subject line: Final notice, invoice [invoice number] for [amount]
Why it works: it leaves no room for misunderstanding. The customer knows this is the last reminder, knows the deadline, and knows the consequence. Do not send a final notice unless you are prepared to follow through on what it says.
What to put in the subject line
Keep the subject line short, and put the invoice number and amount in it. A customer scanning an inbox should be able to tell what the message is about without opening it. Friendly reminder, invoice 1042 for $485 is better than a vague subject like Following up, or Payment needed. At the firm and final steps, add the age of the debt, for example now 7 days overdue, or Final notice, so the customer can see the sequence is moving.
When to send each template
- Before the due date: use the friendly template as a heads up, a day or two before the invoice is due. This is the step that prevents most late payments.
- Day 1: send the friendly template as a reminder that the invoice is now due.
- Day 7: send the firm template, with a specific payment date.
- Day 14: send the final notice, with a deadline and a clear next step.
- Day 30: stop repeating the templates. Call once, send one written final notice if you have not already, and pause new work. Read how to follow up on an overdue invoice for the full schedule.
If you would rather not send these by hand, PaidUp, overdue invoice reminder software for trade shops, sends the friendly, firm, then final reminders by email, and stops when you mark the invoice paid. It is free for up to 5 active invoices, and Pro is $29 a month for unlimited invoices. Add invoices by hand or import a CSV.
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