For each prior year, there is a box that says "Taxable Social Security Benefits in 2021"
This is on the page that asks for that prior year's Adjusted Gross Income. Is this where I put each amount allocated to the prior year? For example, in 2021, part of the allotment was $8600. It's confusing because in parentheses it says "Enter a zero if your Social Security benefits weren't taxable."
