Question: how is uk social security taxed in us?
Answer: A noncitizen of the U.S. is taxed the same as citizens only if he is a resident alien of the U.S. Therefore, even if you are a U.K. citizen, your Social Security benefits are taxable in the U.S. if you are a resident alien under U.S. tax laws. ... A nonresident alien is taxed on U.S. source income only.