Summary
If you make $399,984 a year living in the region of Washington DC, USA, you will be taxed $158,452. That means that your net pay will be $241,532 per year, or $20,128 per month. Your average tax rate is 39.6% and your marginal tax rate is 46.1%. 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 $46.08, hence, your net pay will only increase by $53.92.
Bonus Example
A $1,000 bonus will generate an extra $539 of net incomes. A $5,000 bonus will generate an extra $2,696 of net incomes.