8 B2B Payment Reminder Email Templates to Get Paid Faster

A poorly written collections email doesn't get read. It gets archived, ignored, or worse, generates a dispute where there wasn't one.

Yet most finance teams have been sending the same generic templates for years. No optimised subject line, no personalisation, no clear call to action. The result: low response rates and drifting DSO.

Here are 8 operational B2B payment reminder email templates, adapted to every stage of the collections cycle.

The 5 Rules of a Collections Email That Works

1. The subject line must be specific, not generic
"Reminder" or "Unpaid invoice" are subject lines accountants see 50 times a week. "Invoice #2024-0892, due date passed 15 March" is immediately actionable.

2. Include the exact amount and invoice number
Your client receives dozens of invoices. Without a precise reference, they can't act.

3. Include a direct payment link
Every additional step between your email and payment costs DSO days. A one-click payment link alone can reduce your collection time by 3 to 5 days.

4. Calibrate the tone to the stage of delay
A reminder at day+1 and a reminder at day+45 cannot have the same tone. Progressive escalation preserves the relationship while increasing pressure.

5. Personalise at minimum the first name and invoice reference
A "Hi [First Name]," email with the correct invoice number consistently outperforms a generic message.

Template 1 - Preventive Reminder (3 days before due date)

Subject: Invoice [#] - due in 3 days

Hi [First Name],

Just a quick reminder that invoice [#] for [Amount] is due on [Date].

To make it easy to process: [Direct payment link]

Don't hesitate to reach out if you have any questions.

Best regards,

[First Name] - [Company]

Why it works: The preventive reminder delivers the best ROI. It targets clients who would have paid on time but whose accounting simply needs a prompt. It creates zero relational friction.

Template 2 - First Reminder (day+1 after due date)

Subject: Invoice [#] - payment not received

Hi [First Name],

Unless I'm mistaken, invoice [#] for [Amount] was due on [Date] and hasn't been settled yet.

If payment has already been made, please disregard this message.

Otherwise, you can pay directly here: [Payment link]

Best regards,

[First Name]

Why it works: The phrase "unless I'm mistaken" defuses any tension. It leaves an honourable way out for administrative delays and avoids putting the contact on the defensive.

Template 3 - Second Reminder (day+7)

Subject: Follow-up - Invoice [#] awaiting settlement

Hi [First Name],

I'm following up on invoice [#] for [Amount], due on [Date] and still awaiting payment.

Are you experiencing any particular difficulty? If so, I'm available to discuss and find a suitable solution.

Payment link: [Link]

Best regards,

[First Name]

Template 4 - Third Reminder (day+15)

Subject: URGENT - Invoice [#] for [Amount] - action required

Hi [First Name],

Despite my previous reminders, invoice [#] for [Amount], due on [Date], remains unpaid.

Could you confirm the date on which this payment will be made?

Without a response within 48 hours, I will be obliged to pass this file to our collections team.

[Payment link]

Best regards,

[First Name]

Template 5 - Reminder Requesting Acknowledgement (day+21)

Subject: Invoice [#] - acknowledgement required

Hi [First Name],

I'm contacting you again regarding invoice [#] for [Amount], now [X] days overdue.

Please confirm by return email:

- Your planned payment date

- Or any issue delaying settlement

I remain available to find a solution.

[First Name]

Template 6 - SMS Reminder (day+7 or day+14)

Hi [First Name], invoice [#] for [Amount] has been outstanding since [Date]. Payment link: [Short URL]. Reply STOP to unsubscribe.

Why SMS works: 95% open rate vs 20-25% for email. Use for clients who don't open emails, or as a complement to an unanswered email reminder after 48 hours.

Template 7 - Formal Notice (day+30)

Subject: Formal notice - Invoice [#] - [Amount]

Dear Sir/Madam,

We hereby formally request payment of invoice [#] for [Amount incl. VAT], issued on [Issue date] and due on [Due date].

In accordance with applicable late payment regulations, late payment penalties and a fixed recovery indemnity are applicable.

Failing settlement within 8 days, we reserve the right to initiate formal debt recovery proceedings.

Yours sincerely,

[Name] - [Title] - [Company]

Template 8 - Post-Payment Thank You Email

Subject: Payment received - thank you [First Name]

Hi [First Name],

We've received your payment of [Amount] for invoice [#]. Thank you.

Don't hesitate to reach out if you have any questions.

Best,

[First Name]

Why it matters: A thank-you email after payment strengthens the relationship, cleanly closes the collections cycle, and statistically increases the punctuality of future payments.

For further reading: AI vs Automated Reminders: What's the Real Difference for B2B Collections?

Frequently Asked Questions About Collections Emails

How many reminders should you send before a formal notice?

As a rule: one preventive reminder + 3 post-due-date reminders before a formal notice. That's a 4 to 5 week cycle in total. Frequency and number depend on the client profile and invoice amount.

What time should you send a collections email?

Tuesdays and Thursdays between 9am and 11am show the best B2B open rates. Avoid Monday mornings (overloaded inbox) and Friday afternoons (low processing).

Should you mention late payment penalties in every email?

No. Mention them only from the third reminder or the formal notice onwards. Mentioning them too early creates friction with no added value.