A family of 4 starts paying tax at around $27,000. They're already paying 6.2% in Social Security and 1.45% in Medicare. (This is also matched by the employer.) That's $2,066.

I want to know how many dollars they should pay in taxes. So, we've said social security and medicare is $2,066. How much should a family of 4 making $27,000 be taxed?