How do you adjust taxable amount of soc sec benefits? According to IRS pub 915, U.S. citizens residing abroad benefits are exempt from U.S. tax tax on their benefits.

[j05ip]

Pub 915 extract: U.S. citizens residing abroad. U.S. citizens who are
residents of the following countries are exempt from U.S.
tax on their benefits.

[rjs]

You don't enter the Social Security benefits and then adjust the amount. If you are a resident of one of the countries where your Social Security benefits are exempt from U.S. tax, do not enter the amount from box 5 of your SSA-1099 in TurboTax.

The countries where this applies are Canada, Egypt, Germany, Ireland, Israel, Romania, United Kingdom, and Italy (only if your are also a citizen of Italy).