Here is a simple template you can use to write an authorization letter to encash a check.
Subject: Authorization to Encash Check
This letter is to inform you that I, [Your Name], authorize [Authorized personnel’s name] to encash the check [Check Details] on my behalf. Due to some unforeseen circumstances, I will not be present myself. Therefore, he/she has my full consent to take the aforementioned action.
Please find his/her details as follows.
[Full name of authorized personnel]
[Any identification number of authorized personnel]
[Contact information of authorized personnel]
Please inform me after the check has been encashed by [Authorized personnel’s name] at [Your contact information]. If there are any problems or queries, please contact me on the same. Thank you for your cooperation.