Summary
If you make $4,488 a year living in the region of New Jersey, USA, you will be taxed $442. That means that your net pay will be $4,046 per year, or $337 per month. Your average tax rate is 9.9% and your marginal tax rate is 9.9%. 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 $9.86, hence, your net pay will only increase by $90.14.
Bonus Example
A $1,000 bonus will generate an extra $901 of net incomes. A $5,000 bonus will generate an extra $4,507 of net incomes.