The SSA doesn't know if any of his Social Security is taxable. They can't tell you that. And if it's not taxable why does he have withholding taken out? They might be saying.....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
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
