### Comment:
Yep. Had to explain exactly that to my 23 year old room mate who's been working for years.

### REPLY:
To be fair, while it definitely should be common knowledge, a paycheck isn't going to show you that info, and most people I know use something like TurboTax, which also doesn't give you info like that, you basically just fill out a questionnaire and you're done. I'm not surprised a lot of younger people don't know how it works.

### END.