Summary
If you make $1,638 a year living in the region of Rhode Island, USA, you will be taxed $205. That means that your net pay will be $1,433 per year, or $119 per month. Your average tax rate is 12.5% and your marginal tax rate is 12.5%. 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 $12.50, hence, your net pay will only increase by $87.50.
Bonus Example
A $1,000 bonus will generate an extra $875 of net incomes. A $5,000 bonus will generate an extra $4,375 of net incomes.