Payment reminder letter templates: 3 letters to copy
2026-10-19 · 9 min read
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It is a Tuesday morning and you are looking at an invoice for a commercial customer that is 40 days old. You sent the email reminders. You texted the manager who signed off on the work and got back "I'll push it through." Nothing has come in. The problem is that the person you talk to is not the person who pays. Somewhere there is an accounts payable clerk with a stack of invoices, and yours is not in it, or it is in it with no reason to move to the top.
That is the moment for a payment reminder letter. A letter on your letterhead, addressed to accounts payable, with the invoice attached, lands in the queue the way a vendor statement does. It also gives you a clean written record if the balance keeps sitting there. Below are three payment reminder letter templates you can copy, plus what each one has to include and how to send it.
When a payment reminder letter beats an email or a text
A letter is the right tool once a balance is past the friendly stage and the quick messages have stopped working. For the earlier steps, a short message is better. The payment reminder messages cover the days before and on the due date, and the overdue invoice email sequence covers the first month after.
| Format | Best for | Weak spot |
|---|---|---|
| Text | Nudges before and on the due date, small balances, homeowners | Easy to read and forget, no attachment |
| The first 30 days past due, with the invoice and a pay link | Lands in the inbox of whoever booked the job, not always who pays | |
| Letter | Commercial accounts, larger balances, customers who stopped replying, the step before a final decision | Slower, and it reads as formal, so it is the wrong opening move |
I reach for a letter in three situations: the customer is a business with an accounts payable department, the balance is big enough that I want a paper trail, or the customer has gone quiet on email and text.
What every payment reminder letter includes
Every letter below carries the same pieces. If any of them is missing, the person reading it has to go looking, and that is a reason to set it aside.
- Your business name, address and phone on letterhead
- The date of the letter
- The customer's legal business name and billing address, marked "Attn: Accounts Payable" for a commercial account
- Invoice number, invoice date, original due date and the amount owed
- A one-line description of the work, so whoever opens it knows what it is for
- How to pay: a pay link or QR code, plus your mailing address for checks
- A name and phone number to call with questions
- A copy of the invoice, attached
Payment reminder letter templates
Swap the parts in brackets for your own details. Keep each letter to one page.
Letter 1: the first formal reminder (about 30 days past due)
[Your business letterhead]
[Date]
[Customer business name] Attn: Accounts Payable [Address]
Re: Invoice [#], [amount], due [date]
Dear Accounts Payable team,
Our records show that invoice [#] dated [invoice date] for [one-line description of the work] remains unpaid. The balance of [amount] was due on [due date]. A copy of the invoice is enclosed.
You can pay online at [pay link], or mail a check payable to [business name] to [address]. If this invoice has already been paid, please send the payment date and check or reference number so we can match it on our end.
If anything on the invoice needs correcting, or you need a W-9 or other paperwork to process it, call me at [phone] and I will get it to you the same day.
Thank you,
[Your name] [Title], [Business name]
Keep the line about the W-9. A commercial invoice can sit for weeks because the payer's system needs a document the vendor never sent, and nobody thinks to tell the vendor.
Letter 2: the second reminder (45 to 60 days past due)
[Your business letterhead]
[Date]
[Customer business name] Attn: [Name of the contact, if you have one], Accounts Payable [Address]
Re: Second notice, invoice [#], [amount], now [X] days past due
Dear [Name],
I am writing again about invoice [#] for [amount], originally due [due date]. We sent reminders on [dates] and have not received payment or a reply.
Please pay the balance by [date, about 10 business days out] at [pay link] or by check to [address]. If your company needs to pay over time, call me at [phone] before that date and we can agree on a schedule in writing.
If there is a problem with the work or the invoice, I want to hear about it now so we can resolve it.
Sincerely,
[Your name] [Title], [Business name]
Two things change from the first letter. It names the earlier reminders by date, and it sets a specific pay-by date. Once there is a date on paper, you both know when to check.
Letter 3: the final letter before further action
[Your business letterhead]
[Date]
[Customer business name] Attn: [Owner or decision maker], [Accounts Payable contact] [Address]
Re: Final notice, invoice [#], [amount]
Dear [Name],
This is a final notice regarding invoice [#] for [amount], originally due [due date]. Despite reminders sent on [dates], the balance remains unpaid.
Please pay in full by [date] at [pay link] or by check to [address]. If payment is not received by that date, we will [the next step you actually intend to take, for example: place the account on hold for further work / apply the late fee stated in our agreement dated [date] / refer the balance to a collection service].
If you believe this notice is in error, contact me at [phone] before [date].
Sincerely,
[Your name] [Title], [Business name]
Address this one to the owner or someone with authority as well as accounts payable. Name only a next step you will actually take. Before you put a late fee, interest, or a collection referral in writing, check your contract and your state's rules with your accountant or attorney. What you can charge and how you have to say it depends on your agreement and where you do business, and this post is not legal advice.
How to send a payment reminder letter
Send it two ways: printed and mailed to the billing address, and as a PDF attached to an email to the accounts payable inbox. The mailed copy reaches the office that processes paper. The email copy can be forwarded internally in a minute. Keep a copy of every letter with the date it went out, in the same place you keep the invoice.
Some owners send the final letter by certified mail so they have proof it arrived. Ask your attorney whether that matters in your case.
Sending these by hand, or from your invoicing data
With one or two late commercial accounts a quarter, a Word template and a stamp will do. It breaks down when you have a dozen open balances and the letter depends on someone remembering which invoice hit 30 days this week, finding the address, retyping the numbers, and printing it.
An automated setup handles the retyping. It watches due dates in your invoicing software, and when an invoice reaches the letter stage it fills the template with the customer's billing address, invoice number, dates, amount and pay link, and generates the PDF with the invoice attached. Then it puts the draft in front of you instead of sending it. You read it, sign it, and it goes out by email and to the printer. Every letter gets logged against the invoice, and the moment a payment lands, any letter still waiting is pulled. The Chicago-area pool service company I work with takes payments through Stripe on their own site, so a pay link in a letter or a QR code goes straight to a page where the customer can pay. More on how I build these on the business automation page.
What stays with you
The decision to send stays with you. A letter is formal, and a formal letter to a customer who has paid on time for five years and is having a bad quarter can cost you the relationship. You know which customers deserve a phone call first.
The terms stay with you too: whether to offer a payment plan, how long to give, and what the next step really is. When a customer replies with a dispute instead of a payment, the letters should stop and the conversation should come to you. I set that rule up front, and the system follows it. I would never let the final letter go out without a person reading and signing it.
Questions
What is a payment reminder letter?
A formal, one-page letter that tells a customer an invoice is unpaid, states the amount and due date, and explains how to pay. It is usually sent on letterhead, by mail and as a PDF, after emails and texts have not worked.
When should I send a payment reminder letter?
Around 30 days past due for a commercial account, or sooner if the customer has stopped answering email. Earlier than that, a short email or text is usually enough.
How many payment reminder letters should I send?
Two or three: a first formal reminder, a second with a pay-by date, and a final notice. Call the customer before the final one.
Should I include a late fee in a payment reminder letter?
Only if the fee is in your agreement with the customer and your state allows it. Check with your accountant or attorney before you add one.
If you have a stack of open invoices and would rather the letters drafted themselves from your billing data and waited for your signature, that is the kind of system I build. Start with the free 20 minute process audit.