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Even if not in the US or a US person a portion of Social Security retirement, survivors, or disability benefits may be taxed.
If IRS considers them to be a foreign person for tax purposes (or nonresident alien), SSA is required to withhold a 30 percent flat income tax from 85 percent of their Social Security retirement, survivors, and disability benefits. This results in a withholding of 25.5 percent of their monthly benefit. They may be exempt from this tax (or subject to a lower rate) by treaty.
Please remember that you are required to rate in a positive way (look for the STARS or SMILEY FACES) so I am credited with responding.