If you make $31,000 a year living in the region of California, USA, you will be taxed $5,356. That means that your net pay will be $25,644 per year, or $2,137 per month. Your average tax rate is 17.3% and your marginal tax rate is 25.3%. 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 $25.25, hence, your net pay will only increase by $74.75.
A $1,000 bonus will generate an extra $748 of net incomes. A $5,000 bonus will generate an extra $3,738 of net incomes.