[Your Name] [Your Address] [City, State, ZIP] [Email Address] [Phone Number] [Date] [Recipient's Name] [Recipient's Address] [City, State, ZIP] Subject: Apology for Late Payment — Friendly Dear [Recipient's Name], I hope this letter finds you in good health and high spirits. I am writing to apologize for the delay in making the payment for the outstanding invoice dated [Invoice Date] for the amount of [Invoice Amount]. I take full responsibility for this inconvenience caused due to the unforeseen circumstances that I encountered. Furthermore, I deeply regret that the payment was not made within the agreed-upon timeline. As a valued customer of [Your Company/Organization Name], I understand the importance of fulfilling financial obligations promptly and maintaining a positive business relationship. The delay in payment was caused due to [Mention the Reason for Delay]. [Provide a brief explanation of the reasons behind the delay, such as unexpected personal or financial difficulties]. I want to assure you that this delay has been an exceptional situation and not reflective of our usual prompt payment practices. I take this matter very seriously and have taken immediate steps to rectify the situation. To resolve this matter swiftly, I have already made the payment in full via [Payment Method used]. The funds should reach your account within [mention estimated time]. Additionally, I have taken measures to ensure similar circumstances will not arise in the future. Our financial stability has been restored, and we are committed to maintaining a strong and long-lasting partnership with your esteemed organization. I kindly request your understanding and leniency regarding this matter. Your patience and trust in our company are greatly appreciated. We deeply value our business association and strive to maintain a mutually beneficial relationship moving forward. Please accept my sincerest apologies once again for any inconvenience caused. I assure you that this isolated incident will not be repeated, and all future payments will be made promptly as per the agreed-upon terms. Thank you for your understanding and cooperation. If you have any questions or concerns, please do not hesitate to contact me at [Your Phone Number] or [Your Email Address]. I am at your disposal to address any issues promptly. Thank you for your understanding and I look forward to your positive response. Yours sincerely, [Your Name]