Subject: Gentle Reminder — Overdue Payment for [Invoice/Account No.] Dear [Customer's Name], I hope this letter finds you well. We appreciate your business and would like to bring to your attention that your payment for the outstanding invoice [Invoice/Account No.] is currently overdue. As per our records, the payment amount of [Amount Due] was due on [Due Date], and unfortunately, we have not yet received it. We understand that oversights can happen, and that is why we are reaching out to you with this polite reminder. At [Company Name], we strive to maintain smooth operations and ensure prompt delivery of our products/services. However, unpaid invoices can hinder our abilities to continue providing you with the exceptional service you deserve. Therefore, we kindly request your immediate attention to settle the outstanding balance. If you have already processed your payment, please disregard this reminder, and we apologize for any inconvenience caused. However, if the payment is still pending, we kindly request that you remit the amount due at your earliest convenience to avoid any further complications. Attached to this letter is a copy of the invoice for your reference. You can settle the outstanding balance by making a direct bank transfer or mailing a check to the address mentioned below: [Payment Instructions — Bank Details/ Mailing Address] In case you require any assistance or have any questions regarding your account, please feel free to reach out to our dedicated support team at [Contact Details]. We are here to help you in any way we can. We value your business and want to maintain a long-lasting partnership. Your cooperation in settling this overdue payment would be greatly appreciated. We hope to continue serving you and meeting your expectations in the future. Thank you for your attention to this matter, and we look forward to receiving your payment soon. Best regards, [Your Name] [Your Title/Position] [Company Name] [Contact Details]