To determine if your Social Security will be taxable take half of your Social Security benefit and add to it all of your other taxable income that is called your combined income if you’re a single person and that exceeds $25,000 you will pay taxes on some or most of your Social Security. Find my Social Security and Medicare cheat sheet to go into more detail, detailed to determine how Social Security determines how much of your Social Security will be taxable will be included in your adjusted gr