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

The Internal Revenue Service is a bureau of the U.S. Department of the Treasury. It exists to collect the taxes that fund federal government operations — roads, military, Social Security, Medicare, and everything else the federal government pays for. The IRS also enforces the tax code, meaning it investigates people and businesses that don't pay what they owe and pursues penalties when the law is broken.

The IRS is not a private company, a bank, or a loan servicer. It's a government agency with the power to audit your tax returns, seize assets if you owe back taxes, and prosecute tax fraud. Most homeowners deal with the IRS because of mortgage interest deductions, property tax deductions, or capital gains when they sell a home.

Key Takeaways

  • The IRS collects federal income taxes and enforces tax law; it is part of the U.S. Department of the Treasury, not a separate entity.
  • Homeowners interact with the IRS mainly through deductions (mortgage interest, property taxes) and capital gains reporting when selling property.
  • The IRS has the legal authority to audit returns, assess penalties, and seize property if you owe back taxes.
  • The IRS does not make loans, service mortgages, or handle state or local taxes — those are separate systems.
  • You can contact the IRS by phone, mail, or through its website; scams often impersonate the IRS by phone or email.

How the IRS collects taxes and who pays

The IRS processes tax returns filed by individuals, businesses, and organizations. Most people file once a year, usually by April 15, reporting income from wages, self-employment, investments, rental property, and other sources. The IRS matches what you report against what employers, banks, and other institutions report about you.

If you owe more tax than was withheld from your paychecks or paid through estimated quarterly payments, you pay the difference when you file. If you overpaid, you receive a refund. The IRS does not decide how much tax you owe — the tax code does. The IRS's job is to make sure people and businesses follow that code.

What the IRS does not do

The IRS does not handle state or local income taxes — each state has its own tax agency, and some cities do too. If you owe state taxes, you contact your state's revenue department, not the IRS.

The IRS does not service mortgages, manage student loans, or handle property taxes. Your mortgage lender and your local tax assessor are separate entities. The IRS's role is limited to federal income tax and certain excise taxes (like fuel tax).

The IRS also does not give out grants or assistance programs. Some federal programs offer tax credits — like the Earned Income Tax Credit or the Child Tax Credit — which reduce the tax you owe. These are not grants; they are reductions in your tax liability. You claim them on your tax return.

How homeowners interact with the IRS

When you own a home, the IRS affects your taxes in three main ways. First, you can deduct mortgage interest and property taxes on your federal return if you itemize deductions (rather than taking the standard deduction). This lowers your taxable income.

Second, if you rent out part or all of your home, you must report that rental income and can deduct rental expenses. The IRS has specific rules about what counts as a rental property versus a personal residence.

Third, when you sell your home, you may owe capital gains tax on the profit. Most homeowners can exclude up to $250,000 of gain ($500,000 if married filing jointly) if they lived in the home for at least two of the last five years. Anything above that threshold is taxable income.

IRS audits and enforcement

An audit is an examination of your tax return to verify that the information is accurate and complete. The IRS selects returns for audit based on various factors — some returns are selected randomly, others because they contain unusual deductions or income that doesn't match third-party reports.

If the IRS audits you, it will contact you by mail (never by phone or email initially). You'll be asked to provide documentation for specific items on your return — receipts, bank statements, or other proof. Most audits are handled by mail; some require an in-person meeting.

If the IRS finds that you owe additional tax, it will assess penalties and interest on top of the unpaid amount. If you disagree with the audit result, you have the right to appeal within the IRS system or take your case to tax court.

How to contact the IRS

The IRS operates a phone line at 1-800-829-1040 for individual tax questions. Wait times are often long, especially during tax season. You can also mail questions to the IRS address listed on your tax forms or visit irs.gov to find local IRS offices.

The IRS website includes tax forms, publications, and a search tool for answers to common questions. You can also file your tax return electronically through an approved tax software provider or a tax professional.

Be cautious of scams. The IRS does not initiate contact by phone, email, or text message to demand payment or threaten arrest. If someone claiming to be from the IRS contacts you this way, it is a scam. Hang up and report it to the Treasury Inspector General for Tax Administration (TIGTA) at tigta.gov.

The difference between the IRS and other tax entities

Your state revenue department collects state income tax (in states that have it). Your local assessor's office determines property tax value and sends bills. Your mortgage lender collects property taxes and homeowners insurance as part of your monthly payment, then pays those bills on your behalf — but the lender does not determine the amount.

The IRS is federal only. It does not assess property value, set property tax rates, or collect property taxes. It does not service your mortgage or hold your escrow account. Understanding which agency does what prevents confusion when you receive bills or notices.

Frequently Asked Questions

Can the IRS call me on the phone?

The IRS initiates contact by mail, not by phone, email, or text. If someone calls claiming to be from the IRS and demanding payment or threatening arrest, it is a scam. Hang up and report it to TIGTA at tigta.gov or call 1-800-829-0582.

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

If you receive a notice of tax due and disagree with it, you can request an appeal within 30 days of the notice. You do not have to pay immediately to appeal, though interest continues to accrue on unpaid amounts. The notice will explain your appeal rights.

What happens if I don't file a tax return?

If you owe tax and don't file, the IRS can file a return on your behalf (called a substitute return) and assess tax, penalties, and interest. The penalty for not filing is usually steeper than the penalty for not paying. If you can't pay, filing on time and requesting a payment plan is better than not filing.

Does the IRS handle property taxes on my home?

No. Your local assessor's office sets property tax value and your local tax collector sends the bill. The IRS only handles federal income tax. You can deduct property taxes on your federal return, but the IRS does not collect them.