Marginal tax rate

the rate on your next dollar of income (your top bracket). What a raise or side-hustle dollar is actually taxed at — always higher than your overall effective rate. See Income & Take-Home Pay.

Where it's taught

• Which Dollar Is Worth Most: A Raise, a Side Hustle, or Cutting Costs?
• Roth vs. Traditional: Pay the Tax Now, or Later?
• Two Job Offers: Compare Total Comp, Not Salary