Yep, you're absolutely right, I did double-count the double-tax. Your comment had me re-run the numbers, and this is what I came up with. You are correct that Social Security goes down to $0.
Medicare contributions have no cap, and are 1.45% by both the employer and employee and the 0.9% Obamacare surcharges on the employee only portion (until 2035) kicks in over $250,000 also. Therefore, social insurance contributes a marginal 3.79%
So, the numbers to the best of my knowledge should have been:
13.3% of all income (State) +
39.6% of all income (Federal, including the Donny double-tax) +
2.34% of all income (Medicare, Obamacare - Employee Contributions) +
1.45% of all income (Medicare - Employer Contributions)
=====
56.69%
Then you still have to deal with the fixed portions, the $19,616 [1] in healthcare premiums, the $7,347 you'd have paid in social security tax and the $7,347 your employer would have paid in social security tax. [2]
[1] https://www.kff.org/health-costs/report/2018-employer-health...
[2] https://www.bizfilings.com/toolkit/research-topics/managing-...