Summary
If you make $4,555 a year living in the region of Pennsylvania, USA, you will be taxed $491. That means that your net pay will be $4,064 per year, or $339 per month. Your average tax rate is 10.8% and your marginal tax rate is 10.8%. 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 $10.78, hence, your net pay will only increase by $89.22.
Bonus Example
A $1,000 bonus will generate an extra $892 of net incomes. A $5,000 bonus will generate an extra $4,461 of net incomes.