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).
