$US250K works out about u00a3185K at May 2023 exchange rates. You will pay UK income tax on this along with national insurance contributions and any other taxes that may be assessed on employer provided benefits such as company cars and health insurance. Assume that if you are a regular employee, and not a contractor, you will need to allow about u00a36500 or so for PAYE and NI deductions in the UK; this will vary depending on matters such how much money you put into your pension scheme and your personal tax code, which is something that Her Majestyu2019s Revenue and Customs - HMRC - will prwhen you need one.) But for rough budgeting assume net pay of about u00a39500 every month.We simply donu2019t know enough about your tax affairs in the US - what deductions you can claim, number of dependents and all the other things that make the federal tax code so much fun. You will still file a regular 1040, with some extra lines for UK income and deductions, most of which are arrived at by filling out form 2555 for your foreign income - you may be able to claim housing costs and credit for taxes paid in the UK. If you affairs are more complicated you may need to fill out some additional forms.Itu2019s a complicated process but the upshot of it is that if you are outside the US for the whole of the US tax year and you are paying income tax in the UK, you probably wonu2019t get a second tax bill from the IRS unless you have other foreign income such as investment income. What you do need to do is make sure you file every year. Unless you have a very simple life or think you can handle all the possible permutations yourself , itu2019s much easier to hire a professional to do it all for you.Oh, and no dual citizenship isnu2019t necessary or even helpful - you pay the same amount to HMRC. If you plan on staying and giving up your US citizenship in future it would pay to naturalise here first - bureaucrats really seem to have issues with stateless people.