It could be a million different things. E.g., do you have your own business? Need advice for saving for college and retirement in a tax efficient manner? Any tricky investment-related stuff to deal with? Those are the type of things people tend to want to talk to a professional about. For the more complicated stuff, you don’t want to go to a random person at a place like H&R Block or whatever.

On the flip side, if your personal situation is fairly simple and you only have W-2 income plus maybe some interest and dividend income, then practically any tax preparer should be competent enough to handle that.