if you pay ss tax max every year for 10 years then stop working...
106800*10*12/35=2542
When you retire, you get 690+813=1503/month
90% of 767 = 690 plus
32% of (2542-767) = 813
if you pay ss max for over 35 years, you get 2565/month
106800*10*12/35=8900
90% of 767 = 690 plus
32% of (4624-767) = 1234 plus
15% of (8900-4624) = 641