If you make $31,000 a year living in the region of California, USA, you will be taxed $5,237. That means that your net pay will be $25,763 per year, or $2,147 per month. Your average tax rate is 16.9% and your marginal tax rate is 25.2%. 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 $25.15, hence, your net pay will only increase by $74.85.
A $1,000 bonus will generate an extra $749 of net incomes. A $5,000 bonus will generate an extra $3,743 of net incomes.