Summary
If you make $10,400 a year living in the region of Washington DC, USA, you will be taxed $1,220. That means that your net pay will be $9,180 per year, or $765 per month. Your average tax rate is 11.7% and your marginal tax rate is 13.7%. 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 $13.65, hence, your net pay will only increase by $86.35.
Bonus Example
A $1,000 bonus will generate an extra $864 of net incomes. A $5,000 bonus will generate an extra $4,318 of net incomes.