Unpaid Invoice Demand Letter Template

[Your Name or Business Name]
[Your Title, if applicable]
[Street Address]
[City, State/Province, ZIP/Postal Code, Country]
Phone: [Phone Number]
Email: [Email Address]

[Date]

[Customer / Debtor Name or Business Name]
[Contact Person, if applicable]
[Street Address]
[City, State/Province, ZIP/Postal Code, Country]

Subject: Demand for Payment of Unpaid Invoice(s) – [Account / Customer No.: __________]

1. Introduction and Account Reference

Dear [Mr./Ms./Mx. Last Name] / [To Whom It May Concern],

This letter serves as a formal demand for payment of one or more unpaid invoices issued to you by [Your Name or Business Name]. Despite previous reminders, the invoices listed below remain outstanding and past due.

2. List of Unpaid Invoices

As of the date of this letter, our records show the following invoices remain unpaid:

• Invoice Number: [Invoice No. 1] – Invoice Date: [MM/DD/YYYY] – Due Date: [MM/DD/YYYY] – Amount: [Currency and Amount]

• Invoice Number: [Invoice No. 2] – Invoice Date: [MM/DD/YYYY] – Due Date: [MM/DD/YYYY] – Amount: [Currency and Amount]

• Invoice Number: [Invoice No. 3] – Invoice Date: [MM/DD/YYYY] – Due Date: [MM/DD/YYYY] – Amount: [Currency and Amount]

Subtotal of unpaid invoices: [Currency and Amount]
Accrued interest and/or late fees (if applicable): [Currency and Amount]

Total outstanding balance now due: [Currency and Amount]

3. Payment Deadline

You are hereby required to pay the total outstanding balance in full no later than:

Payment Deadline: [MM/DD/YYYY]

If you have already paid any of the invoices listed above, please provide written confirmation, including the payment amount, date, and method, so that we can update our records.

4. Payment Instructions

Payment may be made using the following details:

Bank Transfer
Account Name: [Account Name]
Bank Name: [Bank Name]
Bank Address: [Bank Address]
Account Number / IBAN: [Account Number / IBAN]
SWIFT / BIC: [SWIFT/BIC]
Payment Reference: [“Unpaid Invoices –” + Account or Invoice Number(s)]

Other Accepted Methods (if applicable)
[Example: “Credit card via our secure payment link,” “Check payable to [Name], mailed to [Address],” “Online payment via [Platform] using reference [Reference].”]

5. Opportunity to Clarify or Dispute

If you believe any invoice has been paid, is incorrect, or is in dispute, you must contact us in writing on or before the Payment Deadline.

Your written response should include:

• Your full name or business name;

• The invoice number(s) concerned; and

• A brief explanation, with copies of supporting documents (such as proof of payment, credit notes, or correspondence).

Correspondence regarding this matter should be sent to:

Email: [Billing or Support Email Address]
Mailing Address: [Mailing Address for Disputes]

6. Consequences of Non-Payment

If we do not receive full payment of the total outstanding balance, or a written response reasonably resolving this matter, by the Payment Deadline stated above, we may proceed without further notice to take one or more of the following actions:

• Place your account on hold and suspend or terminate any further services or deliveries;

• Refer your account to a third-party collection agency;

• Commence legal proceedings to recover the outstanding balance, plus any additional interest, costs, and fees permitted by law;

• Exercise any other rights available to us under our agreement and applicable law.

If collection or legal action becomes necessary, you may be responsible for additional costs and fees, to the extent permitted by law.

7. Reservation of Rights

Nothing in this letter shall be interpreted as a waiver of any rights or remedies available to [Your Name or Business Name]. All such rights and remedies are expressly reserved.

8. Closing

We would prefer to resolve this matter promptly and amicably. We therefore urge you to treat this as a final opportunity to settle the unpaid invoices before further action is considered.

If you wish to discuss this demand, propose a short-term payment arrangement, or clarify any of the amounts listed, please contact us immediately at [Phone Number] or [Email Address].

Sincerely,

[Your Signature, if printed]
[Your Printed Name]
[Your Title, if applicable]
[Your Business Name, if applicable]