I believe the same rules vis a vis taxation of social security benefits would apply but the rate would be cut.
The 9% flat income tax also eliminates FICA and Medicaid taxes so that 7.65% is gone, replaced by 9%.
Yes, but those on medicaid do not pay taxes and those retired (on fixed income pensions) don’t pay FICA. I did go to his site and could not find details. Tried to contact his campaign but the emails would not go through...maybe too busy with questions.