The IRS collects federal income taxes and enforces tax law

The Internal Revenue Service (IRS) is the federal agency that collects income taxes from individuals and businesses, and it enforces the tax code. It is part of the U.S. Department of the Treasury. When you file a tax return, you are sending information to the IRS. When you owe taxes, you owe them to the IRS. When the IRS audits someone or pursues unpaid taxes, that is the agency doing it.

The IRS does not decide tax policy or write tax law — Congress does that. The IRS interprets the law Congress passes and collects the money. It also answers questions about how the tax code works, processes returns, issues refunds, and handles disputes between taxpayers and the government over what is owed.

Key Takeaways

  • The IRS is a federal agency under the Treasury Department that collects income taxes and enforces tax law for the entire country.
  • The IRS processes tax returns, issues refunds, answers tax questions, and pursues unpaid taxes through collection and enforcement actions.
  • You interact with the IRS when you file a return, receive a refund, get audited, or have a dispute over taxes owed.
  • The IRS has regional offices and a phone line (1-800-829-1040), but many routine tasks can be handled through its website or by mail.

How the IRS fits into the federal tax system

The federal government funds itself partly through income taxes. Congress sets the tax rates and rules. The IRS is the agency that actually collects the money and makes sure people and businesses follow those rules. If you earn income, you are required by law to report it to the IRS. If you do not pay what you owe, the IRS can take action — garnishing wages, placing a lien on property, or seizing assets.

The IRS also administers tax credits and deductions that Congress has written into law. For example, if you have a child, Congress created a child tax credit. The IRS is responsible for processing that credit when you file your return. The agency does not decide who deserves the credit; it applies the rules Congress set.

What the IRS does on a day-to-day basis

The IRS processes millions of tax returns each year. It checks returns for math errors and missing information, issues refunds when you have overpaid, and sends notices when something does not match IRS records. If you claim a deduction or credit that looks unusual, the IRS may ask you to prove it — that is an audit.

The IRS also runs the phone line where you can ask tax questions (1-800-829-1040), maintains a website with forms and instructions, and sends out notices and bills. If you owe taxes and do not pay, the IRS sends collection notices and can take enforcement action. The agency also works with state tax agencies and other federal departments to track income and enforce the tax code.

The difference between the IRS and other tax bodies

Each state has its own tax agency that collects state income tax. The IRS collects only federal income tax. If you owe both, you deal with two separate agencies. Some states do not have an income tax at all, so residents in those states only deal with the IRS for income tax.

Local governments also collect property taxes and sales taxes, but those are not handled by the IRS. The IRS focuses on federal income tax from wages, self-employment, investments, and other sources. If you have questions about state or local taxes, you contact your state or local tax authority, not the IRS.

How to contact the IRS

The main IRS phone number is 1-800-829-1040. This line handles general tax questions and account issues. Wait times are often long, especially during tax season (January through April). The IRS website is irs.gov, where you can download forms, read instructions, check your refund status, and find answers to common questions.

You can also mail documents to the IRS. The address depends on where you live and what you are sending; the IRS website lists the correct mailing address for your situation. If you are working with a tax professional or attorney, they can contact the IRS on your behalf using a power of attorney form.

What the IRS cannot do

The IRS cannot change the tax law — only Congress can do that. The IRS cannot forgive taxes you owe simply because you ask; there are specific programs for hardship or payment plans, but those have strict rules. The IRS also cannot give you legal advice or tell you how to structure your finances to avoid taxes (though it can explain how the law applies to your situation).

The IRS also does not make loans or grants. If you see an advertisement claiming the IRS will give you money or that someone can get you a refund you do not deserve, that is a scam. The IRS does not initiate contact by email or text message, and it does not threaten arrest over the phone.

Common reasons you hear from the IRS

You may receive a notice from the IRS for several reasons: your return had an error, you owe additional tax, you are due a refund, the IRS needs more information, or you are being audited. You may also hear from the IRS if you have not filed a return when you were required to, or if you owe back taxes from a previous year.

If you receive a notice, read it carefully. It will explain what the IRS found and what you need to do next. Most notices include a deadline for responding. If you disagree with the IRS, you have the right to appeal, and the notice will explain how. Do not ignore an IRS notice — that can make the situation worse.

Frequently Asked Questions

Is the IRS the same as the Treasury Department?

No. The IRS is an agency within the Treasury Department. The Treasury Department handles all federal money — borrowing, spending, and collecting. The IRS is the part that collects income taxes specifically.

Can the IRS contact me by email or text?

No. The IRS does not initiate contact by email, text, or social media. If you receive a message claiming to be from the IRS asking you to click a link or provide personal information, it is a scam. The IRS contacts people by mail or phone, and only after you have already interacted with them.

What happens if I do not file a tax return?

If you are required to file and do not, the IRS can assess penalties and interest. If you are owed a refund, you will not receive it. The IRS can also pursue collection action for taxes owed. If you have not filed in years, you can still file back returns, and the IRS has programs to help people get current.

Does the IRS handle Social Security or Medicare taxes?

No. The Social Security Administration and Centers for Medicare and Medicaid Services handle those programs. However, Social Security and Medicare taxes are withheld from your paycheck and reported on your tax return, so the IRS sees that information.

Can I negotiate what I owe the IRS?

Not exactly, but the IRS has programs for people who cannot pay in full. You can set up a payment plan, request a temporary delay, or in some cases propose an offer in compromise (paying less than you owe). Each option has specific rules and requirements. Contact the IRS to discuss your situation.