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

IRS stands for Internal Revenue Service. It is a bureau of the U.S. Department of the Treasury, which means it is part of the federal government. The IRS collects income taxes from individuals and businesses, processes tax returns, and investigates people and companies that do not pay the taxes they owe.

When you work, you pay federal income tax. That money goes to the IRS. When you file a tax return each year, you are sending information to the IRS so they can calculate whether you paid the right amount. If you paid too much, they send you a refund. If you paid too little, you owe them money.

The IRS also administers tax credits and deductions — money the government gives back or lets you keep — including the Earned Income Tax Credit (EITC) and the Child Tax Credit. These are programs that reduce the taxes you owe or result in a refund, and the IRS manages who receives them.

Key Takeaways

  • The IRS is a federal agency that collects income taxes, processes tax returns, and enforces tax law.
  • The IRS also administers tax credits like the Earned Income Tax Credit and Child Tax Credit that can result in refunds.
  • You interact with the IRS when you file your annual tax return or when the IRS contacts you about your taxes.
  • The IRS has local offices, a phone line, and a website where you can find forms, instructions, and account information.

How the IRS collects taxes and processes returns

Every year, employers send the IRS information about how much they paid you. The IRS also receives reports from banks, investment firms, and other organizations about income you earned. When you file your tax return, you report your income and claim deductions or credits. The IRS compares what you reported to what they already know about you.

If your return shows you paid too much in taxes during the year, the IRS sends you a refund. If you did not pay enough, you owe the difference. The IRS processes millions of returns each year, and the process usually takes several weeks to several months, depending on whether you filed electronically or by mail and whether your return is straightforward or complex.

What the IRS does if you owe money or do not file

If you owe taxes and do not pay, the IRS can take action. They may place a lien on your property, garnish your wages, or seize your bank account. They can also charge penalties and interest on the amount you owe, which grows over time.

If you do not file a tax return when you are required to, the IRS can file one for you based on the income information they have from employers and other sources. This is called a substitute return, and it usually results in a higher tax bill because you cannot claim deductions or credits you might otherwise receive.

If you cannot pay what you owe, the IRS has payment plans and hardship programs. You can request an installment agreement to pay over time, or you can request an Offer in Compromise if you truly cannot pay the full amount. These options require you to contact the IRS directly.

IRS offices, phone numbers, and how to reach them

The IRS has a main website at irs.gov where you can download forms, read instructions, check the status of your refund, and create an online account to view your tax records. The site also has a tool called "Where's My Refund?" that tells you when your refund will arrive.

You can call the IRS at 1-800-829-1040 for general tax questions. Wait times are often long, especially during tax season (January through April). The IRS also has local offices in most cities, though many services are now handled by phone or online rather than in person.

If you need help understanding your taxes or your IRS account, you can also contact a tax professional, a certified public accountant (CPA), or an enrolled agent — someone licensed by the IRS to represent taxpayers. Many nonprofits also offer free tax preparation and advice to people with low to moderate income.

Tax credits and refunds the IRS administers

The IRS manages several programs that put money back in your pocket. The Earned Income Tax Credit (EITC) is a refundable credit for working people with low to moderate income. If you may have access to, you can receive money back even if you owe no taxes. The Child Tax Credit gives you money for each child under 17 who lives with you. The American Opportunity Credit helps pay for college tuition and fees.

These credits are "refundable," which means if the credit is larger than the taxes you owe, the IRS sends you the difference as a refund. To receive them, you must file a tax return and report the required information, even if you had no income or your income was very low.

The difference between the IRS and state tax agencies

The IRS collects federal income tax only. Most states also collect their own income tax, and that is handled by a separate state agency — often called the Department of Revenue or the State Tax Commission. You file a federal return with the IRS and a separate state return with your state's tax agency.

Some states do not have an income tax. If you live in one of those states, you only file a federal return. If you work in one state but live in another, you may have to file returns in both states. The rules vary, and a tax professional can tell you what you owe.

What happens if the IRS contacts you

The IRS usually contacts you by mail, not by phone or email. If they mail you a letter, it will explain what they are asking about and what documents they need from you. Common reasons include a mismatch between your return and the income information they received, a question about a deduction or credit you claimed, or an audit.

If you receive a letter from the IRS, read it carefully and follow the instructions. You have a deadline to respond, usually 30 days. If you do not understand the letter or disagree with what the IRS is saying, you can contact a tax professional or call the IRS at the number on the letter.

Be cautious of scams. The IRS will not contact you by phone or email demanding immediate payment or threatening arrest. If someone claiming to be from the IRS calls you, hang up and call the IRS directly at 1-800-829-1040 to verify whether they actually contacted you.

Frequently Asked Questions

What is the difference between the IRS and the Treasury Department?

The Treasury Department is a cabinet-level agency of the federal government. The IRS is a bureau within the Treasury Department. The Treasury handles all federal money and finances; the IRS specifically collects taxes and administers tax law.

Do I have to file a tax return every year?

You must file if your income exceeds a certain threshold, which changes each year and depends on your age and filing status. Even if you do not have to file, you should file if you had taxes withheld from your paychecks, because you may receive a refund. The IRS website has a tool to help you determine whether you must file.

Can the IRS take my tax refund if I owe money?

Yes. If you owe back taxes, child support, or certain other debts, the IRS can keep your refund and apply it to what you owe. This is called an offset. The IRS will notify you if this happens.

What if I made a mistake on my tax return?

You can file an amended return using Form 1040-X. You have three years from the original due date to file an amended return and claim a refund. If you owe more money, you should file as soon as possible to avoid penalties and interest.

Is there a fee to file my taxes with the IRS?

No. Filing a tax return with the IRS is free. However, if you use a tax preparation company or hire a tax professional, they may charge a fee. The IRS also offers free tax preparation through the Volunteer Income Tax Assistance (VITA) program for people with low to moderate income.