Summary
If you make $40,638 a year living in the region of Washington, USA, you will be taxed $6,404. That means that your net pay will be $34,234 per year, or $2,853 per month. Your average tax rate is 15.8% and your marginal tax rate is 20.1%. 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 $20.09, hence, your net pay will only increase by $79.91.
Bonus Example
A $1,000 bonus will generate an extra $799 of net incomes. A $5,000 bonus will generate an extra $3,996 of net incomes.