When writing an apology letter for not completing work, it is important to be clear and polite. Begin by addressing the recipient formally, introduce yourself, and state your position. Apologize for not completing the work, provide a reason, and request an extension if needed. Be respectful and concise, ensuring all necessary details like dates, names, and specific issues are included. Avoid unclear language and ensure the letter is professional.
Sample Apology Letter for Not Completing Work
To,
_________,
_________,
_________ (Mention recipient’s details)
Date: __/__/_____ (date)
Subject: Apology for not completing the work
Respected Sir/ Madam,
I would like to inform you that I am _______ (name) and I am working in your reputed company as a _________ (mention designation). My employee ID is _________ (mention your employee ID) and I have been working in ____________ (department name).
I write this letter with utmost respect to apologetically inform you that I have not completed the ___________ (mention work) and the reason behind the same is __________ (mention reason for not completing work).
This is to request you to kindly provide me with an extension of ___________ (mention number of days). I shall be highly obliged for your kind support.
Yours Truly,
__________ (signature),
__________ (name),
__________ (designation)
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Sandeep Bhandari 
Deepanshu Thakral