Yes.Every country in the world taxes people who live there. The US (which claims global jurisdiction over its citizens) taxes you because you are a citizen, the UK (which accepts that its jurisdiction stops at its own border, like every other country except the US) taxes you because you are present and earning money.But you donu2019t pay tax twice.The UK gets the first bite of the cherry - youu2019re living there, so you should pay towards public services. If youu2019re resident, you are taxed like the British taxpayers alongside whom you work, except if you have US investment or rental income that you donu2019t transfer or remit to the UK, special rules for u2018non-domiciledu2022 visitors may mean thereu2019s no UK tax on this non-UK income (this is a complex area - take proper advice).You then report all your income to Uncle Sam too. The IRS lets you exclude a certain amount of foreign earned income for US tax purposes (up to $103,900 for 2018). If, even with the exclusion, you still owe US income taxes on your UK compensation, you should be able to claim a credit for UK taxes paid that reduces your US tax liability.Again, this is a complex area - take proper advice.Itu2019s actually even more complex, because social security taxes operate under different rules. You should pay in only the UK or the US, but which countryu2019s rules apply depends on the exact circumstances and how they fit with the US-UK bilateral social security treaty.Take advice (I hope that is clear by now!).