| A | B |
| Tax | Required payment to a local, state, or national government. |
| Revenue | Money collected or received by a government |
| Proportional Tax | Takes same percentage out of everyone's income |
| Progressive Tax | Takes a larger percentage of the income of high-income people than of low-income people. |
| Regressive Tax | Takes a larger percentage of the income of low-income people than of high-income people. |
| Income Tax | All income that you earn is subject to this. |
| Social Security Taxes | These taxes pay for Social Security programs. |
| Sales Tax | This is the main revenue source for state governments. |
| Excise Taxes | Tax on certain product such as fuel or firearms. |
| Property Taxes | These taxes are based on the value of land and buildings owned. |
| Benefit Principle | Those who benefit from a public service should pay for it. |