When writing an apology letter to your boss for not completing work, it's crucial to express genuine regret, provide a clear explanation for the delay, and assure your boss that you will complete the task promptly. Maintain a polite and respectful tone throughout the letter, and commit to delivering the work by a specified deadline.
Sample Apology Letter for Incomplete Work
To,
__________ (Recipient’s Details)
__________ (Name of the Company)
__________ (Company’s Address)
Date: __/__/____ (Date)
Subject: Apology for incomplete work
Respected Sir/ Madam,
My name is ________ (name) and I work as ________ (designation) in your company having employee ID __________ (employee ID number).
I write this letter to apologize for the work which was provided to me. I beg to inform you that the work provided to me has not yet been completed by me. The reason behind the same is _________ (unavailability of sources/ not well/ delayed supply/ any other).
I ensure that the work would be completed by __/__/____ (date) and shall be submitted to you positively by the mentioned date. I beg your kind forgiveness.
Thanking you,
________ (Signature),
________ (Name),
________ (Contact Number)
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Sandeep Bhandari 
Deepanshu Thakral