A collection letter is a written request asking a customer to pay an overdue invoice. Sent at the right time and tone, it recovers the cash while keeping the relationship intact. Below are copy-and-paste templates for a standard three-stage escalation.
When to send collection letters
Don't wait. A simple reminder the day after an invoice goes past due recovers far more than a harsh letter sent 90 days late. The usual rhythm:
- Stage 1 — friendly reminder: a few days overdue
- Stage 2 — firm follow-up: ~15–30 days overdue
- Stage 3 — final demand: ~45–60 days overdue, before escalating
Stage 1 — Friendly reminder
Subject: Invoice [#] — now past due
Hi [Name], I hope you're well. Our records show invoice [#] for [amount], due on [date], is now past due. If payment is already on its way, thank you — please disregard this note. Otherwise, could you let me know when we can expect it? You can pay via [payment methods]. Happy to resend the invoice if helpful. Best regards, [Your name, company, phone]
Stage 2 — Firm follow-up
Subject: Second notice — invoice [#] overdue by [X] days
Hi [Name], Invoice [#] for [amount] was due on [date] and is now [X] days overdue. We've not yet received payment or heard from you. Please arrange payment within [5 business days], or contact me to discuss. If there's an issue with the invoice, let me know right away so we can resolve it. Payment details: [methods]. Thank you for your prompt attention. [Your name, company, phone]
Stage 3 — Final demand
Subject: FINAL NOTICE — invoice [#], immediate payment required
Dear [Name], Despite previous reminders, invoice [#] for [amount], due [date], remains unpaid and is now [X] days overdue. This is a formal final request for payment in full within [7 days] of this letter. If payment is not received by [date], we will have no choice but to [suspend further orders / refer the account to a collections agency / pursue the matter further], and late fees of [amount/rate] may apply per our terms. We would much prefer to resolve this directly. Please contact me immediately. [Your name, title, company, phone]
Collection Letter Template (Free Download)
Here is a free, blank collection letter template in a clean business format. Download it, fill in the bracketed fields, and match the tone to the stage you are at. Download the collection letter template
Tips that get you paid
- Always reference the invoice number, amount, and due date.
- Keep stage 1 warm — most late payments are oversights.
- Be specific about the next step and deadline in later stages.
- Set clear payment terms up front so "overdue" is unambiguous.
A better fix than chasing payments
Chronic late payers tie up your cash. Instead of waiting and chasing, invoice financing advances most of each invoice's value as soon as you raise it — so a slow-paying customer no longer dictates your cash flow.
Related free templates: invoice tracker template.
FAQ
What is a collection letter? A written request asking a customer to pay an overdue invoice, usually sent in escalating stages from a friendly reminder to a final demand.
When should I send a collection letter? Send a friendly reminder as soon as an invoice is past due, a firmer follow-up around 15–30 days, and a final demand around 45–60 days before escalating.
What should a collection letter include? The invoice number, amount, original due date, how many days overdue, a clear request to pay by a specific date, and payment instructions.
How can I avoid chasing overdue invoices altogether? Invoice financing advances most of an invoice’s value when you issue it, so you get the cash upfront instead of waiting and chasing the customer.
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