My employer is taken taxes out of my paycheck for my spouse who is not an employee
My job requires a spouse or domestic partner to open up a well portal account if they are going to be on our insurance so that they can do the biometrics. With them opening up their own separate accounts, they have the same access on their accounts as we do on ours. On of the choices that they have as we do is to complete some self verified activities each quarter and if they meet the goal they can earn $100 amazon gift card up to three times a year just as the employees can. My job makes us pay taxes on our gift cards that we receive each quarter if we meet the goal. We have learned that if our spouses or domestic partner completes the activity on their account they also receive the gift cards, however because my employer has no way of taxing them because they are not employees of theirs, they tax the employees paycheck without our permission for that spouse or domestic partner. We just gained knowledge of these and I am wondering if that is legal?