This question already has an answer here:
I found out that a co worker is making 10,000 dollars more than me. My boss handed me a document that had increases for all our employees by mistake. He grabbed in back when he realized it had someone in my same position pay on it. I have been with the company longer and held more responsibilities than my co worker. I had an idea that he was making more but I no proof of it.
Last year, my boss emailed me the same information. I was able to read it before he came to my desk to delete it. I knew for a year my co worker was making more. So I went to my boss to ask for more responsibilities to try to help myself for next review. He definitely gave me more. So for a year, I kept my mouth shut and busted by butt. This review I received the minimum.
I also found out that he gave $1000 dollars of my bonus to my coworker. Every year we get $2000 dollar bonus. This year I received $1000 dollars and my co worker received $3000. That was also listed on the document.
How do I approach my boss?