The IRS is the federal agency that collects income taxes and enforces tax law in the United States

The Internal Revenue Service (IRS) is a bureau of the U.S. Department of the Treasury. Its job is to collect the federal income taxes that individuals and businesses owe, and to enforce the rules in the tax code. When you file a tax return, you are sending information to the IRS. When the IRS audits a return or sends a notice about taxes owed, that is the IRS acting in its enforcement role.

The IRS processes roughly 150 million individual tax returns each year. It also handles employer payroll taxes, business income taxes, excise taxes, and estate taxes. The agency maintains records of what you have reported, cross-checks that information against what your employer or bank has reported, and decides whether your return is correct or whether you owe more.

Key Takeaways

  • The IRS is a federal agency under the Treasury Department that collects income taxes and enforces tax law.
  • The IRS matches information from your tax return against reports from your employer, bank, and other sources to verify what you owe.
  • If the IRS believes you owe more tax, it will send you a notice by mail — not by phone, email, or text.
  • The IRS has the power to place liens on property, garnish wages, and levy bank accounts if taxes go unpaid for a long time.
  • You can contact the IRS by phone, mail, or in person at a local office, but wait times are often long.

How the IRS gets information about your income

Every employer that pays you sends a copy of your W-2 form to the IRS. Banks and investment firms send 1099 forms for interest, dividends, and other income. Mortgage companies report the interest you paid. Freelance clients who paid you more than $600 send 1099-NEC forms. The IRS receives all of these documents before you file your return.

When you file your return, the IRS compares what you reported against what these third parties reported. If you claim you earned $40,000 but your employer reported $45,000, the IRS will notice the gap. If you do not report income that a third party reported, the IRS will likely send you a notice asking you to explain the difference or pay the additional tax.

What happens if the IRS thinks you owe money

The IRS will contact you by mail if it believes you owe additional tax or if there is a problem with your return. It will not call you, email you, or text you — the IRS communicates about tax matters through the postal service. The notice will explain what the IRS found, how much it says you owe, and how long you have to respond.

You have the right to disagree with the IRS. The notice will include instructions for requesting an appeal or submitting additional information. If you do nothing and do not pay, the IRS can place a lien on your property, garnish your wages, or levy your bank account. These enforcement actions happen only after the IRS has sent notices and given you time to respond.

The difference between the IRS and other tax agencies

The IRS handles federal income tax only. Your state may have its own income tax, collected by a state revenue department or tax commission — not the IRS. Local property taxes are collected by your county or municipality. Payroll taxes (Social Security and Medicare) are collected by the IRS but are separate from income tax, though they appear on your pay stub.

If you owe back taxes to your state, that state's tax agency will contact you, not the IRS. If you owe property taxes, your county will contact you. Each level of government has its own collection process and its own rules about payment plans and enforcement.

How to contact the IRS

You can reach the IRS by phone at 1-800-829-1040 for individual tax questions. The IRS also has a website at irs.gov where you can read forms, read publications, and check the status of a refund. You can visit an IRS office in person, though locations and hours vary by city. Wait times on the phone are often several hours, especially during tax season.

If you receive a notice from the IRS, the notice itself will include a phone number and instructions for responding. Do not ignore an IRS notice. Even if you disagree with it, you must respond within the important date stated in the letter, or you lose your right to appeal.

What the IRS cannot do

The IRS cannot arrest you for owing back taxes. It cannot seize your home without going through a legal process that takes months. It cannot demand payment over the phone or by gift card. If someone calls claiming to be from the IRS and demanding when ready payment, that is a scam.

The IRS also cannot tell you how to file your return or what deductions to claim — that is your responsibility or the responsibility of a tax professional you hire. The IRS can only verify what you reported and enforce the tax code as written.

Payment plans and hardship options

If you owe the IRS money but cannot pay it all at once, you can request a payment plan. The IRS offers short-term plans (120 days or less) and long-term installment agreements (several years). You can request a plan by phone, by mail, or through the IRS website. There is a fee to set up a plan, usually between $31 and $225 depending on the method you use.

If you are facing serious financial hardship, you can request that the IRS temporarily pause collection efforts while you work out your situation. This is called an offer in compromise or a currently not collectible status. These options require documentation of your income and expenses, and approval is not may provide. A tax professional or a low-income taxpayer clinic can help you explore these options.

Frequently Asked Questions

Is the IRS the same as the Treasury Department?

No. The IRS is a bureau within the Treasury Department. The Treasury Department oversees the IRS and other agencies that manage federal money, but the IRS specifically handles tax collection and enforcement.

Can the IRS take my house if I owe back taxes?

The IRS can place a lien on your house, which means it has a legal claim against the property. A lien does not force a sale, but it prevents you from selling or refinancing without paying the tax debt first. The IRS can force a sale only in rare cases after a long process and only if the tax debt is very large.

What should I do if I get a letter from the IRS?

Read the letter carefully and note the important date for responding. If you agree with it, follow the payment instructions. If you disagree, the letter will explain how to request an appeal or submit additional information. Do not ignore it — missing the important date can result in the IRS taking collection action without further notice.

Do I have to pay the IRS if I disagree with what they say I owe?

You can request an appeal before paying, but you must do so within the important date stated in the notice. If you miss the important date, you can still dispute the debt, but you may have to pay first and then request a refund. A tax professional can help you decide the best approach for your situation.

What is the difference between an audit and a notice?

An audit is a detailed examination of your return by an IRS agent, usually triggered by something unusual or a random selection. A notice is a letter about a specific issue — usually a mismatch between what you reported and what the IRS found in its records. Most IRS contacts are notices, not audits.