When writing an apology letter for the late submission of an invoice, it is important to be clear and polite. Address the recipient respectfully, explain the reason for the delay, and apologize sincerely. Include relevant details, such as the invoice ID and order number, and attach the invoice with the letter. Request an acknowledgment and express hope for future opportunities to serve better. Avoid unclear language and ensure all necessary details are included.
Sample Apology letter for Late Submission of Invoice
To,
_________,
_________,
_________ (Mention recipient’s details)
Date: __/__/_____ (date)
Subject: Apology for the delay in issuance of invoice
Dear ___________ (mention name of client),
First of all, I would like to apologize for the delay that you have faced in issuance of your invoice ____________ (mention invoice ID) for __________ (order number). Respected, I understand that all this happened was due to negligence and was a reflection of unprofessionalism.
We apologize for the inconvenience that we have caused. We are hereby attaching the invoice along with the letter and we request you to kindly send your acknowledgment. Furthermore, we apologize for the delay and believe that you would give us another chance to serve you better.
For,
__________ (Company Name),
__________ (signature),
__________ (name),
__________ (contact number)
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Sandeep Bhandari 
Deepanshu Thakral