Yes, undocumented immigrants pay taxes in the United States, and they pay a lot of them. Federal law requires anyone earning income in the country to pay federal income tax regardless of immigration status, and the IRS issues Individual Taxpayer Identification Numbers so people without Social Security Numbers can file returns. On top of income tax, undocumented workers have Social Security and Medicare taxes withheld from their paychecks, and everyone living here pays sales, excise, and property taxes through daily purchases and rent.
Why Immigration Status Does Not Change the Tax Obligation
The Internal Revenue Code defines gross income as “all income from whatever source derived.”1Office of the Law Revision Counsel. 26 U.S. Code 61 – Gross Income Defined Nothing in that definition limits the obligation to citizens or authorized workers. If you earn money in the United States, you owe federal income tax on it.
The IRS classifies filers by where they live, not by whether they have permission to be here. Someone physically present in the U.S. for at least 31 days during the current year and 183 days over a three-year lookback period meets the substantial presence test and is treated as a resident alien for tax purposes.2Internal Revenue Service. Substantial Presence Test Resident aliens report worldwide income on the same Form 1040 U.S. citizens use. Nonresident aliens who do not meet that test report only income from U.S. sources.3Internal Revenue Service. Topic No. 851, Resident and Nonresident Aliens
Filing Without a Social Security Number
Federal law requires every person filing a return to include an identifying number. When no Social Security Number is available, the Individual Taxpayer Identification Number fills that role.4Office of the Law Revision Counsel. 26 U.S.C. 6109 – Identifying Numbers The ITIN is a nine-digit processing number issued by the IRS solely for tax purposes.5Internal Revenue Service. About Form W-7, Application for IRS Individual Taxpayer Identification Number A person applies using Form W-7, attaches it to a completed tax return, and submits identity documents such as a passport or a combination of national identification and birth records.
An ITIN can be used by the primary filer, a spouse, or a dependent. It does not authorize work, it does not confer immigration status, and it does not qualify anyone for Social Security benefits. It exists so people who owe tax have a way to pay it.
Payroll Taxes and Where the Money Goes
When an undocumented worker holds a job with a formal employer, that employer withholds payroll taxes from every paycheck. Social Security tax takes 6.2% of gross wages and Medicare tax takes another 1.45%, for a combined 7.65% employee share. The employer matches that amount, bringing the total contribution to 15.3% of wages.6Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
These withholdings flow to the federal government whether or not the Social Security Number on the W-2 is valid. When the name and number do not match anyone in the Social Security Administration’s records, the wages get routed to the Earnings Suspense File, a holding account for wages that cannot be credited to a specific worker.7Social Security Administration. 20 CFR 422.120 – Earnings Reported Without a Social Security Number or With an Incorrect Employee Name or Social Security Number As of September 2024, that file held more than $2.3 trillion in accumulated wages and over 415 million wage items dating back to 1937.8Social Security Administration. Full FY 2024 Agency Financial Report
Not all of that money comes from undocumented workers. Clerical errors and name changes after marriage also produce mismatches. But a substantial share represents payroll taxes paid by workers who will never collect the Social Security or Medicare benefits those taxes fund.
The same pattern shows up in unemployment insurance. Federal law requires a worker to be legally authorized to work in order to be “available for work,” a basic condition for unemployment benefits.9U.S. Department of Labor. Eligibility of Aliens for UC Under Section 3304(a)(14)(A), FUTA An undocumented worker whose employer paid unemployment taxes on their wages cannot collect if they are laid off. The taxes go in; the benefits do not come back out.
Sales, Excise, and Property Taxes
Income and payroll taxes only capture part of the picture. No one checks documents at a cash register. Every time anyone buys groceries, fills a gas tank, or pays rent, they contribute to government revenue.
Sales taxes apply to most retail purchases in the great majority of states. Excise taxes add another layer. Every gallon of gasoline includes 18.4 cents in federal excise tax plus an average of roughly 33 cents per gallon in state-level taxes that fund road and transportation infrastructure.10U.S. Energy Information Administration. Frequently Asked Questions – How Much Tax Do We Pay on a Gallon of Gasoline and on a Gallon of Diesel Fuel? Similar taxes apply to tobacco and alcohol. These consumption taxes are baked into the price of goods and collected automatically.
Property taxes work the same way. Undocumented immigrants who own homes pay them directly. Renters pay them indirectly, because landlords build property tax costs into monthly rent. Either way, the money reaches local school districts, fire departments, and other municipal services.
Paying In, Getting Less Back
Filing with an ITIN does not open the door to every credit a Social Security Number holder can claim. The largest low-income tax benefits are off-limits, which pushes the effective tax rate for many ITIN filers above what similarly situated citizens pay.
The Earned Income Tax Credit requires a valid Social Security Number. The statute defines “taxpayer identification number” for EITC purposes as a Social Security Number issued by the SSA, which excludes anyone filing with an ITIN. For a low-income family, that single exclusion can mean forfeiting thousands of dollars a year.11Office of the Law Revision Counsel. 26 U.S.C. 32 – Earned Income
The Child Tax Credit has a similar restriction. Both the parent and the qualifying child must have valid Social Security Numbers for the full credit, worth up to $2,200 per child in 2026. A parent filing with an ITIN whose child also lacks an SSN cannot claim it.12Internal Revenue Service. Child Tax Credit
Some credits are still available. The Credit for Other Dependents, worth up to $500, can be claimed for a dependent with an ITIN who does not qualify for the Child Tax Credit.12Internal Revenue Service. Child Tax Credit Education credits, including the American Opportunity Tax Credit worth up to $2,500 per eligible student, are available to filers with either an SSN or an ITIN.13Internal Revenue Service. Education Credits – AOTC and LLC Still, the exclusion from the EITC and full CTC means the tax system returns far less to undocumented filers than to comparable low-income households with Social Security Numbers.
Are Tax Records Shared With Immigration Enforcement
This is the question most undocumented taxpayers ask before filing. The statutory answer has long been no. Section 6103 of the Internal Revenue Code states that tax returns and return information “shall be confidential” and generally prohibits any federal or state employee from disclosing them.14Office of the Law Revision Counsel. 26 U.S.C. 6103 – Confidentiality and Disclosure of Returns and Return Information Narrow exceptions exist for criminal investigations backed by a court order and for sharing certain payroll data with the Social Security Administration.15Internal Revenue Service. Disclosure Laws
That framework was tested in 2025. In April, the IRS and Immigration and Customs Enforcement signed a memorandum of understanding to share taxpayer information for immigration enforcement purposes. By August, the IRS had disclosed tens of thousands of taxpayer records to ICE, including home addresses. In November 2025, a federal court in Center for Taxpayer Rights v. Internal Revenue Service blocked further sharing, finding the disclosures were likely unlawful and violated the IRS’s own confidentiality rules. Internal IRS lawyers had reportedly advised agency leadership that the arrangement likely violated privacy law before the disclosures occurred.
The litigation is ongoing. Section 6103 remains on the books, but its enforcement depends on the courts and on the IRS’s willingness to follow its own rules. Anyone weighing whether to file should understand both the statutory protection and the fact that it was challenged in unprecedented ways in 2025.
What Happens If You Do Not File
Skipping a return carries its own risks. If you owe taxes and do not file, the IRS charges a failure-to-file penalty of 5% of the unpaid tax for each month the return is late, up to 25%. If the return is more than 60 days late, the minimum penalty is $525 or 100% of the tax owed, whichever is less.16Internal Revenue Service. Failure to File Penalty
A separate failure-to-pay penalty of 0.5% per month applies to any unpaid balance, also capping at 25%.17Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges The two penalties stack, plus interest. Someone who neither files nor pays can watch penalties consume close to half of the balance within a year.
There is also money on the other side of the ledger. If an employer withheld more in taxes than the worker actually owes, the only way to recover that money is to file. Many low-wage workers are in exactly that position. Not filing means leaving your own money with the government while also accumulating potential penalties on anything the IRS later determines you owed.