Final answer:
Individuals are required to pay income taxes on wages, tips, and investment earnings.
Step-by-step explanation:
The individuals who are required to pay income taxes in the United States are:
- Wages: Individuals are required to pay income taxes on their wages or salary that they earn through employment.
- Tips: Individuals are also required to pay income taxes on their tips, such as those earned by restaurant servers.
- Investment earnings: Lastly, individuals are required to pay income taxes on their investment earnings, which include income from stocks, bonds, and mutual funds.
Gasoline and store purchases do not directly require individuals to pay income taxes in the United States.