“I’ve just found out that I’m being under-compensated. When I speak to my boss on this, should I bring up how my peer is being compensated vs myself given that we hold similar job scope / responsibilities?”
Unless your company has a policy of salary transparency or your country has an Equal Pay Act, using your peer’s compensation can be viewed as unprofessional and get yourself (where did you get that information?) or your peer (if he/she is supposed to keep his salary confidential) into trouble. Also, you want your employer to see that it is right for you to deserve a higher pay because of the value you have brought and can bring to the table. Not only because the person next to you is being paid more.
That’s not to say you should stay silent on the matter. Here are my three cents’ worth on navigating this tricky conversation.
The Mean HR Lady 