NEW STEP BY STEP MAP FOR SOCIAL SECURITY CHECKS

My partner & I'll both be turning 70 in 2024, so We'll commence using social security. I understand that 85% will likely be taxable & that we can easily specify nearly 22% be withheld for federal tax. So how Is that this accomplished? Is just 85% from the month-to-month check taxed at 22% or is your complete every month total taxed? I keep a spread