Comment by cmurphycode

can you clarify how you got that result?

70,000 - 8800 (married filing jointly) - 2000 (two dependents) = $59200 taxable income, $2960 tax bill. An effective rate of 4.22%

To reach the site's stated 3.29%, this family would need to make around 32k a year.

Fwiw, it appears the average household income in Massachusetts is about 80k.