The United States operates on a federal tax system, meaning both the national government and individual state governments can levy taxes. The main source of revenue for the federal government is the individual income tax. This is the tax you pay on the money you earn throughout the year.

This system funds everything from national defense and infrastructure to social programs like Social Security and Medicare. Think of it as pooling money to pay for services that benefit everyone.

This means you pay your taxes throughout the year as you earn income, not all at once at the end of the year. For most people with a traditional job, this happens automatically through tax withholding from each paycheck. If you're self-employed or have other sources of income, you might pay these taxes in quarterly installments.

The agency in charge of collecting federal taxes is the Internal Revenue Service, or IRS. It's a bureau of the Department of the Treasury. The IRS has two main jobs: collecting the taxes owed by individuals and businesses, and enforcing the nation's tax laws.

While its enforcement role can seem intimidating, a major part of the IRS's mission is to help taxpayers understand and meet their obligations. They provide tax forms, instructions, and customer service to assist millions of people with the filing process each year.

Not every dollar you receive is taxed. The government only taxes what it defines as "taxable income." This is your gross income minus any eligible deductions. It’s the final amount of your earnings that's subject to tax.

Taxable income includes more than just your salary. It can also cover tips, bonuses, investment returns, and even certain types of gambling winnings. On the other hand, some sources of money, like gifts, inheritances, or life insurance payouts, are generally not considered taxable income.

Every year, you're required to report your income to the government by filing a tax return. This is the process of reconciling the taxes you've already paid throughout the year with the amount you actually owe.

If you paid more than your total tax liability, you get a refund. If you paid less, you'll owe the remaining balance. Filing a tax return ensures everyone pays their fair share and keeps the system running.

Understanding these basics provides a solid foundation for navigating your own tax obligations.