The Internal Revenue Service exists to collect the federal taxes that fund the U.S. government, enforce the tax laws Congress passes, and deliver benefits like refundable credits to tens of millions of households. In fiscal year 2024, the agency brought in more than $5.1 trillion in gross taxes and processed over 266 million returns.1Internal Revenue Service. SOI Tax Stats – IRS Data Book Every dollar Washington spends — on the military, Social Security, Medicare, federal courts, disaster response, interest on the national debt — passes through IRS collection systems first. That single fact explains why the agency exists and why it has the powers it does.
Where the IRS Gets Its Authority
The agency’s foundation is constitutional. The Sixteenth Amendment, ratified in 1913, gave Congress the power to tax income directly. Congress then wrote that power into the Internal Revenue Code, and Sections 7801 and 7803 authorize the Secretary of the Treasury to run a bureau for collecting federal taxes and appoint a Commissioner to head it.2Internal Revenue Service. The Agency, Its Mission and Statutory Authority The IRS is that bureau. It doesn’t set tax policy; Congress does. The agency’s job is to carry the policy out.
Its stated mission is to help the majority of taxpayers understand and meet their obligations while ensuring the minority who refuse to comply pay their share.2Internal Revenue Service. The Agency, Its Mission and Statutory Authority Those two halves — service and enforcement — shape almost everything the agency does.
What Federal Taxes Actually Pay For
Without the IRS, the federal government has no reliable way to pay for anything. Tax revenue funds national defense, interstate highways, federal courts, public-land management, and disaster relief. When a hurricane or wildfire triggers a federal emergency response, tax dollars pay for FEMA deployments, temporary housing, and long-term rebuilding. The same pool covers federal employee salaries and interest on the national debt.
The two largest line items in the federal budget depend almost entirely on payroll and income taxes the IRS collects. Social Security and Medicare together account for roughly a third of all federal spending, and both programs would run dry without consistent tax inflows. Consolidating collection in one agency lets the Treasury project revenue accurately enough to plan multi-year budgets, issue bonds, and keep the government’s borrowing costs low.
Enforcing the Tax Code
The U.S. system is built on voluntary compliance: you calculate what you owe and file a return. Enforcement is what keeps that system honest.
The most visible enforcement tool is the audit, a review of your records to verify that what you reported matches reality.3Internal Revenue Service. IRS Audits Most audits are handled by mail and focus on a specific deduction or income item. The actual audit rate for individual returns is low, but the possibility is part of what discourages people from cheating.
The quieter tool does more of the work. Information matching compares the wages and investment income on your return against the W-2s and 1099s that employers and financial institutions file separately. When the numbers don’t line up, you hear from the IRS. On top of that, the Bank Secrecy Act requires financial institutions to report cash transactions exceeding $10,000 in a single day, and to file suspicious activity reports when they spot patterns suggesting someone is structuring deposits to dodge that threshold.4Financial Crimes Enforcement Network. The Bank Secrecy Act That data feeds directly into IRS criminal investigations.
Criminal Penalties for Tax Evasion
Deliberately trying to evade taxes is a felony. A conviction can carry a fine of up to $100,000 for an individual ($500,000 for a corporation) and up to five years in prison.5Office of the Law Revision Counsel. 26 U.S. Code 7201 – Attempt to Evade or Defeat Tax The operative word is “willfully.” The government has to prove you knew you owed the tax and intentionally tried not to pay it. Math errors and honest mistakes don’t reach that bar.
Civil Penalties for Everything Else
Most enforcement never involves criminal charges. The IRS imposes an accuracy-related penalty of 20% of any underpayment caused by negligence, carelessness, or a substantial understatement of income.6Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments That’s the penalty for inflating deductions or leaving income off a return without crossing into fraud.
Separate penalties apply if you file or pay late:
- Failure to file: 5% of the unpaid tax for each month or partial month the return is late, capped at 25%.7Internal Revenue Service. Failure to File Penalty
- Failure to pay: 0.5% of the unpaid tax per month, also capped at 25%. If you set up an installment agreement, the rate drops to 0.25% per month.8Internal Revenue Service. Failure to Pay Penalty
The failure-to-file penalty runs ten times higher than the failure-to-pay penalty. That’s why the standard advice is to file on time even when you can’t pay the balance. Filing and setting up a payment plan limits the damage. Ignoring the deadline compounds it fast.
Paying Benefits Out Through the Tax Code
The IRS is not only a collection agency. It also pushes billions of dollars back out through refundable tax credits that function as direct financial assistance. In fiscal year 2024, the agency issued nearly $490.6 billion in refunds.1Internal Revenue Service. SOI Tax Stats – IRS Data Book Because the agency already holds income data for most households, it can verify eligibility for these programs without a separate benefits bureaucracy.
Earned Income Tax Credit
The Earned Income Tax Credit helps low-to-moderate-income workers by reducing their tax bill or producing a refund larger than what they owe.9Internal Revenue Service. Earned Income Tax Credit (EITC) The credit scales with income and the number of children. For the 2025 tax year, the maximum was $8,046 for a family with three or more qualifying children and $649 for a worker with no children.10Internal Revenue Service. Earned Income and Earned Income Tax Credit (EITC) Tables For many recipients, the EITC is the single largest lump sum they receive all year, working as a wage supplement delivered through the tax code.
Child Tax Credit
The Child Tax Credit reduces the tax liability of families with qualifying children.11Internal Revenue Service. Child Tax Credit The credit amount and refundability rules have changed several times in recent years, and the One, Big, Beautiful Bill Act signed into law on July 4, 2025, made additional changes for tax year 2026. Check the IRS Child Tax Credit page for the current amount before you rely on a number, because legislative updates shift the figures between tax years.
Education and Energy Credits
The American Opportunity Tax Credit covers up to $2,500 per eligible student for qualified higher-education expenses, with 100% of the first $2,000 and 25% of the next $2,000 counting toward the credit.12Internal Revenue Service. Education Credits – AOTC and LLC Part of that credit is refundable, so students from families with little or no tax liability can still benefit. The Lifetime Learning Credit is a second option for graduate students and part-time learners who don’t qualify for the AOTC.13Internal Revenue Service. Tax Benefits for Education: Information Center
Energy-efficiency credits work the same way, using the tax return to reward homeowners who install heat pumps, energy-efficient windows, or insulation. Dollar caps and qualifying-product rules change as legislation evolves, so confirm current limits on the IRS site before making purchases.14Internal Revenue Service. Energy Efficient Home Improvement Credit
Your Rights When Dealing With the IRS
Federal law limits what the agency can do to you. Ten specific taxpayer rights are codified in 26 U.S.C. § 7803, and the Commissioner is required to ensure every IRS employee acts in accordance with them.15Office of the Law Revision Counsel. 26 U.S. Code 7803 – Commissioner of Internal Revenue They include:
- The right to be informed about tax laws, IRS procedures, and decisions on your account.
- The right to quality service: prompt, courteous, professional help.
- The right to pay no more than the correct amount, with all payments and credits properly applied.
- The right to challenge the IRS’s position and be heard, with documentation and counterarguments considered.
- The right to appeal an IRS decision to an independent forum, including the IRS Office of Appeals and the U.S. Tax Court.
- The right to finality: knowing the maximum time to challenge an IRS position and the maximum time for the IRS to complete an audit.
- The right to privacy, meaning enforcement actions must be no more intrusive than necessary.
- The right to confidentiality of information you provide, unless disclosure is authorized by you or by law.
- The right to retain representation by an attorney, CPA, or enrolled agent.
- The right to a fair and just tax system that considers facts and circumstances affecting your ability to pay or provide information.
When those rights aren’t working, the Taxpayer Advocate Service can step in. TAS is an independent organization inside the IRS that helps taxpayers facing economic harm, delays of more than 30 days without resolution, or systems that aren’t functioning as they should.16Internal Revenue Service. Who May Use the Taxpayer Advocate Service The service is free and confidential, and it’s open to both individuals and businesses.
What the IRS Is Not
Because the agency has real power, scammers spend a lot of effort pretending to be it. The IRS publishes a “Dirty Dozen” list of tax scams each year, and the 2026 edition flags phishing texts and emails that use QR codes to send taxpayers to fake IRS sites, along with more than 600 social media impersonators the agency identified in fiscal year 2025 alone.17Internal Revenue Service. Dirty Dozen Tax Scams for 2026: IRS Reminds Taxpayers to Watch Out for Dangerous Threats AI-powered robocalls can now spoof caller ID and mimic human speech.
The single most useful fact to remember: the IRS almost always contacts you by mail first. The agency does not leave threatening voicemails, demand immediate payment over the phone, or ask you to click a link in a text message. If a message feels urgent and alarming, the urgency itself is the scam. Hang up, delete the message, and check your IRS online account directly if you’re worried about a balance.
For added protection, any taxpayer with a Social Security number or Individual Taxpayer Identification Number can request a six-digit Identity Protection PIN through their IRS online account.18Internal Revenue Service. Get an Identity Protection PIN (IP PIN) The PIN must appear on your return for it to be accepted, which blocks anyone who has your Social Security number from filing a fraudulent return in your name. A new PIN is generated each year and becomes available in your online account starting in mid-January. Parents and legal guardians can request an IP PIN for dependents as well. If you can’t create an online account, you can apply by mail using Form 15227 when your adjusted gross income is below $84,000 ($168,000 for married filing jointly).
That combination — a constitutional mandate to collect revenue, statutory authority to enforce the tax code, a delivery system for household benefits, and a codified set of taxpayer rights — is the full answer to why the IRS exists. Take away any one piece and the federal government stops working the way it does.