A 是工資總數
B 是 "dental+HSA savings +Medical insurance + Vision" + "Group term life insurance"
所以， SSA上的數就比全年收入數小了。
寫的更清楚點：
A (一年工資數） - B (dental+HSA savings +Medical insurance + Vision) + C (Group term life insurance)
==your taxed medicare earnings (show in SSA statement)
太高興了， 又搞懂一點了。
謝謝
