Taxation for L1A/L1B holder


Can somebody advise the taxes on income applicable for me when I land in New Jersey sometimes in September this year on an L1A/L1B visa . I am trying to calculate my monthly take home. I would be filing as a married person with kid.

I know that fed and NJ state taxes need to be paid but haven’t got a clear understanding of those taxes and any other taxes I’ll have to pay. Also the deductions taken for Medicare , retirements benefits etc , will they be refunded iff and when I have to go back after say 5 years that L1B allows.

Thanks in advance.