If you are receiving SSI (Supplemental Security Income), those payments are not included in MAGI. These benefits are different from Social Security payments. The MAGI used to calculate your taxable social security benefits is your gross income plus taxable tax exempt interest less exclusions for Savings Bond interest. That might be the schedule you are looking at.
The pandemic has affected your taxes in many ways. Including reporting in TurboTax the amount of stimulus money you received. Click Here for more information on how the Pandemic affected your 2020 taxes.
