If you are in the UK and resident there then yes, you would need to report your income in the UK as well. The US allows an exclusion form tax on foreign earned income or a tax credit for taxes paid in the UK on the same income taxed in the US. This covers you under tax treaty arrangement form Double Taxation.
You have to pay tax on your income if you come to live in the UK. Income includes:
You’ll pay Income Tax on income above your Personal Allowance.
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You are physically in the UK so the income you receive from your work while in the UK is taxable to the UK.
The UK tax year runs differently than the UK tax year.
The tax year is from 6 April to 5 April the following year. Residents normally pay UK tax on all their income, whether it’s from the UK or abroad.
You’re automatically resident if either:
You usually need to fill in a Self Assessment tax return if you’re a UK residentwith foreign income or capital gains.
Use the ‘foreign’ section of the tax return to record your overseas income.
Self Assessment is a system HM Revenue and Customs (HMRC) uses to collect Income Tax. You need to register if you didn’t send a tax return last year.
As this is your first year I am going to suggest that you seek a local tax professional.
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Do you understand now that as a resident in the UK you have a tax obligation to the UK and as a US citizen you still have a tax reporting obligation to the US?
You are most welcome.