Demand Letter for an Unpaid Invoice — Free Template
When a customer or client has ignored your invoice and your reminders, a demand letter for an unpaid invoice is the formal next step. It refers to the invoice by number, confirms what was delivered, restates the amount and original due date, and gives a final deadline before you file a claim.
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Free to preview[Your name or business name]
[Your mailing address]
October 15, 2026
[Who owes you the money]
Re: Final demand for payment of [Amount owed ($)]
Dear [Who owes you the money],
I am writing to formally request payment of [Amount owed ($)] that you owe me.
Nature of the debt: An unpaid invoice for goods or services.
[What the money is for]
Payment was due on [When payment was originally due]. As of the date of this letter, I have not received it, and the full balance of [Amount owed ($)] remains unpaid.
Please pay [Amount owed ($)] in full no later than [Your final payment deadline]. You can pay as follows: [How they should pay you]
If you believe you do not owe this amount, or you dispute any part of it, please tell me in writing before that date and explain why. If you cannot pay the full amount at once, contact me before the deadline to propose a written payment plan.
If I have not received payment, or a written proposal I agree to, by [Your final payment deadline], I intend to file a claim in small claims court to recover the amount owed, plus court costs and any other amounts the court allows.
I would prefer to settle this without going to court. I am keeping a copy of this letter and proof that I sent it.
Sincerely,
[Your name or business name]
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Make the invoice easy to identify
Include the invoice number, invoice date, the goods or services delivered and the date they were delivered or accepted. Accounts payable departments match payments to invoice numbers, and a letter without one can sit unprocessed.
Attach a copy of the invoice and any proof of delivery or approval, such as a signed delivery slip or an email saying the work was received. That removes the most common excuses.
Send it to someone who can pay
If your contact has stopped responding, address the letter to the business owner, the accounts payable department or the company's registered address. Your state's business registry often lists the official name and address of a company.
Use the business's legal name, which may differ from its brand name. If you end up in small claims court, you will need the correct legal name on the claim.
Late fees and interest
If your invoice or contract included a late fee or interest on overdue balances, you can mention it and include it in the amount owed. If it did not, it is usually safer to ask only for the invoice amount, since adding new charges can be disputed.
Going forward, clear payment terms on every invoice, such as the due date, accepted payment methods and any late fee, make collecting much easier.
What to do, step by step
Gather the paperwork
Collect the invoice, contract, loan note, returned check, texts or emails that show what was agreed, how much is owed and when it was due.
Fill in your details
Answer the questions above. Stick to facts and numbers — the amount, what it's for, the original due date and a firm new deadline.
Send it with proof of delivery
Mail the letter by certified mail with return receipt, and email a copy if you normally communicate that way. Keep a copy of everything you send.
Wait for the deadline
Give the other side until the date in the letter. If they offer a payment plan, get it in writing before you agree.
File in small claims if needed
If the deadline passes with no payment, you can file in small claims court in the county where the debtor lives or where the deal was made. Bring this letter and your proof of mailing.
What if they still don't pay?
An ignored demand letter still does its job: it creates a dated record that you asked for the money, explained what it was for and gave a reasonable deadline. Small claims judges routinely ask whether you tried to collect before suing, and this letter answers that question.
Small claims court is built for people representing themselves. Filing fees are modest, forms are short and hearings are informal. Each state sets its own dollar limit, so check your county court's website — if the debt is above the limit, you can usually choose to waive the excess and still use small claims.
Winning a judgment is not the same as being paid, but it gives you tools such as wage garnishment or a bank levy that most debtors want to avoid. Many people pay once they receive notice of a court date.
Example demand letter for unpaid invoice
A filled-in sample with made-up details, so you can see the finished result.
Bayside Print & Sign Co.
27 Harbor Rd, Portland, ME 04101
October 5, 2026
Harbor Street Dental Group
112 Harbor St, Portland, ME 04101
Re: Final demand for payment of $3,640.00
Dear Harbor Street Dental Group,
I am writing to formally request payment of $3,640.00 that you owe me.
Nature of the debt: An unpaid invoice for goods or services.
This is for invoice #3381, dated June 12, 2026, for 2,000 printed patient brochures and two exterior signs, which were delivered and signed for at your office on June 10. The invoice terms were net 30. I sent reminders on July 20, August 18 and September 15.
Payment was due on July 12, 2026. As of the date of this letter, I have not received it, and the full balance of $3,640.00 remains unpaid.
Please pay $3,640.00 in full no later than October 29, 2026. You can pay as follows: By check payable to Bayside Print & Sign Co. mailed to the address above, or by card through the payment link on invoice #3381.
If you believe you do not owe this amount, or you dispute any part of it, please tell me in writing before that date and explain why. If you cannot pay the full amount at once, contact me before the deadline to propose a written payment plan.
If I have not received payment, or a written proposal I agree to, by October 29, 2026, I intend to file a claim in small claims court to recover the amount owed, plus court costs and any other amounts the court allows.
I would prefer to settle this without going to court. I am keeping a copy of this letter and proof that I sent it.
Sincerely,
Bayside Print & Sign Co.
Frequently asked questions
How long should I wait before sending a demand letter for an unpaid invoice?
Many businesses send one or two friendly reminders first, then a formal demand when an invoice is 30 to 60 days past due. There is no single rule. If the client has gone silent or said they will not pay, you can send it sooner.
Can I stop working for a client who hasn't paid?
Usually you can pause further work until past-due invoices are paid, unless your contract says otherwise. Tell the client in writing that work is paused until the balance is paid, and avoid holding back work they have already paid for.
What if the client says the work wasn't good enough?
Ask them to explain the problem in writing. If they accepted or used the work without complaint, say so in your letter. You can decide whether to offer a fix or a partial discount to settle, or to pursue the full amount.
Is a demand letter for payment legally required before suing?
Not always, but many small claims courts expect you to have asked for payment first, and some types of claims, such as bad checks in many states, have a written-demand step before extra damages become available. A clear letter is the easiest way to show you tried to resolve the debt.
How long should I give them to pay?
Ten to fourteen days is common and looks reasonable to a judge. Shorter deadlines can seem unfair unless the debt is long overdue. Pick a specific calendar date rather than a number of days so there is no confusion about when the deadline passes.
FairLetter is not a law firm and does not provide legal advice. Letters are templates you customize and send yourself.