Subject: Important Notice Regarding Late Payment of Outstanding Invoice [Your Name] [Your Address] [City, State, ZIP Code] [Email Address] [Phone Number] [Date] [Recipient's Name] [Recipient's Position] [Company Name] [Company Address] [City, State, ZIP Code] Dear [Recipient's Name], I hope this letter finds you well. I am writing to bring to your attention the late payment of an outstanding invoice that is currently past due. This invoice was due on [Due Date], as agreed upon in our contract. As a valued customer, we understand that occasional delays may occur due to unforeseen circumstances. However, timely payments are crucial for maintaining a healthy business relationship. We kindly request your immediate attention and prompt action to settle this matter. Please find enclosed a detailed breakdown of the invoice in question: Invoice Number: [Insert Invoice Number] Invoice Date: [Insert Invoice Date] Original Amount Due: [Insert Amount Due] Late Payment Fee: [Insert Late Payment Fee] Current Amount Due: [Insert Current Amount Due] To ensure a smooth resolution, please arrange for the payment to be made within [Specify a Grace Period] from the date of this letter. You can remit the payment via [Preferred Payment Method], referencing the invoice number as a payment reference. If there are any concerns or discrepancies regarding the invoice, kindly reach out to us promptly so that we may resolve them. We greatly appreciate your prompt attention to this matter and your continued support. If the payment is already on its way, please disregard this notice. We value our business relationship and hope to continue serving your needs in the future. Should you require any further information or assistance, please feel free to contact our Accounts Receivable department at [Your Phone Number] or [Your Email Address]. We are always available to address any concerns or queries you may have. Thank you for your immediate attention, and we look forward to resolving this payment matter to our mutual satisfaction. Yours sincerely, [Your Full Name] [Your Job Title] [Company Name]