Answer:
The answer is: marginal tax rate
Step-by-step explanation:
The IRS uses tax brackets to determine how much taxes you owe. As your gross income increases and you pass to the next tax bracket, your tax rate also increases.
For example, a single filer who earns $75,000 a year will have a 22% tax rate. If his income increases to $85,000, then his tax rate will be 24%.