Retirement tax questions

You're allowed to pay for others peoples things and they pay you back...IRS doesn't care about, or have knowledge of things like that.    I have a friend that doesn't have checking account, I've written checks and paid for her stuff and she's paid me back in cash.   I'm sure it happens quite often with many people.
♪♫•*¨*•.¸¸♥Lisa♥ ¸¸.•*¨*•♫♪