Specify the new title, salary and benefits. This is not the place for a list of new job responsibilities, but rather a time to congratulate and praise the employee for his/her accomplishments.
1234, Main Street
Boston, MA 02123
<Recipient Address Goes Here>
I'm pleased to confirm your promotion to <new job title>. Through your dedication and hard work you've earned not only new responsibilities but our gratitude as well.
Your new job will begin on <date>. At that time, your salary will increase to <$amount>. <Optional other benefits.>.
We value all of our employees, but we're especially pleased to watch someone who rises to the challenges presented and grows with the company. Congratulations and thank you.
encl: <List of enclosed items goes here>