A more thorough explanation:

IRS

The Internal Revenue Service (IRS) is a government agency responsible for collecting taxes and enforcing tax laws in the United States.

When you file your income tax return, you send it to the IRS. The IRS will then process your return and determine if you owe any taxes or if you will receive a refund.

If you fail to pay your taxes or file your tax return on time, the IRS may impose penalties and interest on the amount you owe.

These examples illustrate how the IRS is responsible for collecting taxes and enforcing tax laws. They also show how the IRS can take action if individuals do not comply with these laws.