When drafting an apology letter for a mistake at work, it's crucial to maintain a respectful and apologetic tone while clearly acknowledging the error committed. Provide specific details about the mistake, including when it occurred and why it happened, without making excuses. Express genuine remorse and assure the recipient that steps will be taken to prevent a recurrence.
Sample Apology Letter for Mistake at Work to Boss
To,
__________ (Recipient’s Details),
__________ (Name of the Company)
__________ (Company’s Address)
Date: __/__/____ (Date)
Subject: Apology for the mistake
Respected Sir/ Madam,
I am ___________ (name) working in __________ (department) as a __________ (designation) in your reputed company i.e. _________ (company name). My employee ID is __________ (employee ID number).
I write this letter to apologize for __________ (mention what you did) which was done by me on __/__/_____ (date). This was completely unintentional and came out as _________ (mention why you did the same). I know the same can not be undone but I ensure that the same would not be repeated.
I believe you would consider this as a genuine request. I once again beg your kind forgiveness.
Thanking you,
________ (Signature),
________ (Name),
________ (Contact Number)
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Sandeep Bhandari 
Deepanshu Thakral