But you would save more by not having to buy your own medical insurance. I know an expat who moved to work for citi in the states from the UK and he was paying

But you would save more by not having to buy your own medical insurance. I know an expat who moved to work for citi in the states from the UK and he was paying around 20% just for him -his wife kids are covered by her federal Job. UK NI is about 13% and that includes state pension, unemployment and the NHS