Rbaiapinto,
Isn΄t the 11% Social Security tax already included on the 41,5% and 43,5% tax respectively?
If that is the case, and using my previous examples:
if your income is 51,000, your net will be approx. 26,553 /year (2,213 /month)
if your income is 77,000, your net will be approx. 38,719 /year (3,227 /month)
if your income is 100,000, your net will be approx. 50,285 /year (4,190 /month)