Yes, undocumented immigrants do pay taxes, and they pay most of the same ones everyone else does: federal and state income taxes, Social Security and Medicare payroll taxes, self-employment taxes, sales and excise taxes at the register and the gas pump, and property taxes built into rent. The IRS taxes income regardless of immigration status, and roughly four million tax returns are filed each year using a special taxpayer ID the agency issues to people without a Social Security number.
How People Without a Social Security Number File
The IRS created the Individual Taxpayer Identification Number (ITIN) in 1996 so that anyone required to pay U.S. taxes could file, even without a Social Security number.1eCFR. 26 CFR 301.6109-1 – Identifying Numbers It’s a nine-digit number that looks like an SSN but is used strictly for tax processing. An ITIN doesn’t authorize work, and it doesn’t change anyone’s immigration status. It exists so the government can collect revenue from filers who owe it.
Undocumented workers use an ITIN in place of a Social Security number on Form 1040 and on any state return they’re required to file. An ITIN can expire if it isn’t used on a return for three consecutive years, and letting it lapse delays any refund until it’s renewed.2Internal Revenue Service. It’s Time Again for Folks to Renew Their ITINs
Federal Income Tax on Wages
Section 1 of the Internal Revenue Code imposes tax on the taxable income of every individual, with no carve-out based on citizenship or immigration status.3Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed If you earn income in the United States, you owe tax on it.
For undocumented workers on a normal payroll, federal income tax is withheld from each paycheck based on the Form W-4 the employee submits, and the money goes straight to the Treasury.4Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate At year-end the worker gets a W-2 and files a Form 1040 by the April deadline, using an ITIN in the space where a Social Security number would go. The rates and brackets are identical to those for any other filer.
Self-Employment Tax on Cash and Contract Work
Not every undocumented worker has a payroll job. Day laborers, independent contractors, and people in cash-heavy fields like construction, landscaping, and food service are still legally required to report their income. They file a Schedule C alongside their 1040 and use an ITIN in place of an SSN.
The self-employment tax bites harder than payroll withholding because the worker pays both halves of the Social Security and Medicare tax: 12.4% for Social Security plus 2.9% for Medicare, totaling 15.3% on net self-employment income.5Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax That’s before regular income tax. On $40,000 of net self-employment income, the self-employment tax alone runs about $6,120.
Social Security and Medicare Contributions
On a regular paycheck, 6.2% of gross wages comes out for Social Security and 1.45% for Medicare, with the employer matching each.6Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates The deduction happens automatically whether the number on the W-4 is valid, borrowed, or invented. In 2026, Social Security tax applies to the first $184,500 in earnings.7Social Security Administration. Contribution and Benefit Base
When the Social Security Administration receives a W-2 whose name and number don’t match any real record, the reported wages land in the Earnings Suspense File.8Social Security Administration. 20 CFR 422.120 – Earnings Reported Without a Social Security Number or With an Incorrect Employee Name or Social Security Number The file now holds taxes paid on well over a trillion dollars in earnings, and that money has already gone out the door funding benefits for current retirees and disabled Americans.9Social Security Administration. Status of the Social Security Administration’s Earnings Suspense File Unauthorized workers aren’t the only source, but researchers consistently identify them as the largest one. The contributions flow in; the benefits don’t flow back out.
Sales, Excise, and Property Taxes
These get less attention because they don’t involve filing anything, but they add up. Forty-five states levy a sales tax, and the combined state-and-local rate averages roughly 7.5% nationally, with some jurisdictions above 10%. Every grocery run, gas fill-up, and retail purchase generates that revenue regardless of who’s buying.
Federal and state excise taxes are baked into the price of specific goods. The federal excise tax on gasoline is 18.4 cents per gallon and goes almost entirely to the Highway Trust Fund for road and bridge maintenance.10Congress.gov. Suspension of the Federal Gas Tax: In Brief State gas taxes stack on top, and similar excises apply to tobacco and alcohol.
Property taxes reach undocumented renters indirectly. Landlords pass property tax costs through in the rent, and those taxes fund local schools, police, fire departments, and other municipal services. Undocumented immigrants who own homes pay property taxes directly.
State and Local Income Taxes
The same ITIN works for state filings. In the roughly 40-plus states with an income tax, undocumented residents who earn above the filing threshold are required to file a state return, whether their income came through a W-2 or self-employment. State rates range from flat rates under 3% to progressive rates above 10%. Five states have no income tax at all. Everywhere else, ITIN filers pay into the same pool that funds state roads, Medicaid, schools, and public safety.
Credits ITIN Filers Cannot Claim
The system collects fully but gives back selectively. Several of the most valuable federal credits are closed to ITIN filers, which pushes the net contribution of an undocumented worker above what a citizen at the same income would pay.
The Earned Income Tax Credit requires a valid Social Security number for the filer, the spouse, and every qualifying child. An ITIN doesn’t qualify.11Internal Revenue Service. Who Qualifies for the Earned Income Tax Credit (EITC) For low-income working families, this credit is worth thousands of dollars a year, and the exclusion costs many undocumented households that entire amount.
The Child Tax Credit is structured the same way. Each qualifying child must have a Social Security number valid for employment, and the filer (or spouse) must also have one.12Internal Revenue Service. Child Tax Credit For 2025 the credit reaches up to $2,200 per child. In mixed-status families, a parent filing with an ITIN generally cannot claim it even for children who are U.S. citizens.
The practical result: an undocumented worker earning $35,000 with two children pays the same income and payroll taxes as a citizen in the same situation but can miss out on $8,000 or more in combined credits that citizen would receive.
Does the IRS Share Filer Information with Immigration Authorities
This is the concern that stops many people from filing. Section 6103 of the Internal Revenue Code makes tax returns and return information confidential, and it bars any federal officer or employee from disclosing that information except in a narrow set of statutory exceptions.13Office of the Law Revision Counsel. 26 USC 6103 – Confidentiality and Disclosure of Returns and Return Information Immigration enforcement is not one of those exceptions. The IRS has long kept its revenue function separate from immigration work, because the agency’s incentive is to keep people filing.
Why Filing Matters Even Without Legal Status
The obligation to file applies to everyone with income above the threshold. Willful failure to file or pay can carry a fine up to $25,000 and up to a year in prison for each violation, though criminal prosecution for simple non-filing is rare; civil penalties, interest, and late-filing fees are the more common consequence.14Office of the Law Revision Counsel. 26 USC 7203 – Willful Failure to File Return, Supply Information, or Pay Tax
There’s a second reason to file. A consistent record of tax compliance can matter later. If a path to legal status opens through marriage, a change in law, or a discretionary waiver, years of filed returns show good faith and integration. Years of unreported income are difficult to fix after the fact. Filing today doesn’t change anyone’s status, but it builds a paper trail that can.