The Social Security Medicare Deduction doesn't count or affect anything. The full gross Social Security is what matters.
Up to 85% of Social Security becomes taxable when all your other income plus 1/2 your social security, reaches:
Married Filing Jointly: $32,000
Single or head of household: $25,000
Married Filing Separately: 0
For the Social Security reduction.......how old are You? Are you still working? If you are over full retirement age your actual ss checks won't be reduced. Otherwise they will actually reduce your payments if you make too much other income in the prior year. See SS FAQ for working after retirement
https://www.ssa.gov/planners/retire/whileworking.html
Also if you have a high income they will increase your Medicare Premium deduction the next year. So you could get less net deposit.
