I recently graduated from college in June and have started my career. I am employed in a company with a rotational program in which I'll be moving each year for 4 or 5 years and am stationed in NY right now. I decided not to bother changing my address, vehicle registration, insurance, and driver's license (herein known as "Information") from my parents house in PA because I would have to do it every year. I have also worked in PA early in the year while still attending school.

Am I required by law to change my Information?

How will all of this information affect my tax filing next April? Would it be financially beneficial for me to just go ahead and change my Information? In which state should/would I file my taxes?