When writing an apology letter for a mistake made at work, it's crucial to maintain clarity and politeness. Clearly acknowledge the mistake, take full responsibility, and express genuine remorse. Offer to accept any consequences or fines and assure that the mistake will not recur. End the letter with a hopeful tone for a positive response.
Sample Letter of Apology for the Mistake done at Work
To,
__________(Name of the Recipient)
__________(Name of the Company/Office)
__________(Address)
Date: __/__/____(Date)
From,
__________(Name)
__________(Name of the Company)
__________(Address)
Subject: Apology for a mistake
Respected Sir/Madam,
With due respect, I am __________ (Your Name) working in department __________(Mention your department). This letter is to bring to your notice that I am extremely sorry for __________(Mention mistake- data shared/ Improper work/ shared information/ misplaced some important documents, any other mistake).
I hereby take full responsibility for the mistake and accept the ______ (charges/fine). I hope you will accept my apology and forgive me. I assure you that this mistake will not be repeated in the future. Hoping to receive a positive response from your side.
Yours Faithfully/Sincerely,
__________(Name)
__________(Contact Details)
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Sandeep Bhandari 
Kshitij Tarun