Summary
If you make $4,488 a year living in the region of Washington DC, USA, you will be taxed $523. That means that your net pay will be $3,965 per year, or $330 per month. Your average tax rate is 11.7% and your marginal tax rate is 11.7%. 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 $11.65, hence, your net pay will only increase by $88.35.
Bonus Example
A $1,000 bonus will generate an extra $884 of net incomes. A $5,000 bonus will generate an extra $4,418 of net incomes.