Your home address
Today's date
Company's address
For the attention of [your line manager]
Dear [your line manager]
I am writing to you to tender my resignation from [name of company], effective today. [you can discuss your notice in person]
I am leaving in order to [what you're doing on your career break; if you're travelling, include when you expect to be back].
I have enjoyed working at [name of company] and appreciate the opportunities that have been offered to me here. [If you like your job and/or your manager, add something here about how you would like to stay in touch.]
Wishing you and [name of company] continued success,
[your full name]