Summary
If you make $15,000 a year living in the region of Washington, USA, you will be taxed $1,418. That means that your net pay will be $13,582 per year, or $1,132 per month. Your average tax rate is 9.5% and your marginal tax rate is 18.1%. 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 $18.09, hence, your net pay will only increase by $81.91.
Bonus Example
A $1,000 bonus will generate an extra $819 of net incomes. A $5,000 bonus will generate an extra $4,096 of net incomes.