Here is a sample authorization letter from a husband to a wife.
Subject: Authorization from Husband to Wife
I hereby authorize my wife [Name] to act on my behalf and conduct all the activities requiring either my approval or consent. I also authorize her to sign all documents on my behalf. You are requested to provide my wife with all the essential documents and details. This authorization letter will be valid from [Start Date] to [End Date].
I am enclosing the proof of my identity as well as my wife’s identity for confirmation of my relationship with her.
Please feel free to contact me on [Email/contact number] in case of any query concerning this letter