1. Understand your marginal vs. effective rate
Your marginal rate matters for “what happens if I earn $1 more?” decisions. Your effective rate matters for “how much of my income goes to federal income tax overall?”.
If your marginal rate is 22%, a raise of $1,000 adds about $220 of federal income tax, not 22% of your entire income. The calculator shows both so you can see the real impact of raises, bonuses, or side-hustle income.
2. Use deductions and accounts to move down brackets
Contributions to tax-advantaged accounts (like traditional 401(k)s or IRAs if you qualify) can reduce your taxable income. For some filers, this can keep part of income inside a lower bracket and reduce the amount taxed at higher rates.
The closer you are to a bracket threshold, the more powerful each pre-tax dollar can be in shaping where your last dollar lands.
3. Look at your full tax picture, not just income tax
Federal income tax is one piece of your total tax load. You may also pay Social Security and Medicare (FICA), state income tax, property tax, and sales tax.
Use this tool as your federal starting point, then layer in state information and other taxes to see your true “all-in” rate.