In a few weeks I'll be moving to America, NY specifically. I was wondering how income tax works over there? If I understand correctly a majority of people here are from the US so it'd be super useful if I could throw a quick question at you all!

I'll be in America for 3 years, maybe a few more if my contract is extended. In the UK I use this salary tool so I know my exact numbers before I get my payslip (useful for me as I'm currently self-employed). Is there something similar in the US? I'm a little unsure how tax works over there as it differs by state.
Anyone got some advice/good sites to take a look at?
Thanks!
