Summary
If you make $51,418 a year living in the region of Massachusetts, USA, you will be taxed $11,000. That means that your net pay will be $40,418 per year, or $3,368 per month. Your average tax rate is 21.4% and your marginal tax rate is 25.6%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of $100 in your salary will be taxed $25.55, hence, your net pay will only increase by $74.45.
Bonus Example
A $1,000 bonus will generate an extra $745 of net incomes. A $5,000 bonus will generate an extra $3,723 of net incomes.