English 
Português 
Español 
Obtaining U.S. citizenship is often seen as the final step in the immigration journey. Starting in 2025, however, a less-discussed front has gained significant momentum: the intersection between tax conduct and naturalization eligibility. The Department of Justice has included financial and tax fraud among its civil denaturalization priorities, substantially expanding the universe of naturalized citizens who could, in theory, have their citizenship re-examined.
This shift connects two domains historically treated separately. On one side, the federal tax system, administered by the Internal Revenue Service (IRS). On the other, the immigration system, coordinated by USCIS and the Department of Homeland Security (DHS). The combination creates a form of risk that many attorneys have begun calling lifetime exposure: immigration consequences tied to tax conduct committed even before citizenship was granted.
The DOJ’s New Guidance
A memorandum from the DOJ‘s Civil Division, dated June 2025, lists ten priority categories for denaturalization investigations. Among them, two deserve special attention from citizens with a less straightforward tax history: fraud against the federal government through programs such as Medicare, Medicaid, and PPP loans, and participation in private financial fraud schemes.
In practical terms, the DOJ makes clear that tax evasion, filing a false tax return, and other tax offenses can support a citizenship revocation petition when linked to an inaccurate statement made during the naturalization process. This is a significant development for the approximately 25 million naturalized citizens living in the United States.
The Legal Connection to the N-400
The Form N-400 is the application used to request naturalization. In its section on moral character, there is a series of questions about criminal history. One of them, known as Question 15a, asks whether the applicant has ever committed, assisted in committing, or attempted to commit a crime or offense for which they were not arrested.
This is precisely where the boundary between taxation and immigration dissolves. Anyone who underreported income, concealed foreign accounts, failed to report significant revenue, or engaged in other conduct classified as an offense under the federal tax code — and answered “no” to the question about unpunished crimes — may have, in the DOJ’s view, provided a false statement at a decisive moment in the naturalization process.
The government’s legal argument in these cases is typically twofold: the applicant would have obtained citizenship illegally by failing to meet the good moral character requirement, and would have made a materially false statement constituting intentional concealment of a relevant fact.
No Statute of Limitations
Two factors amplify the risk. The first is the absence of a statute of limitations in civil denaturalization. Unlike the criminal route, where the limitation period is ten years, the civil route allows the government to reopen a naturalization case twenty or thirty years after the oath ceremony, provided it presents clear, convincing, and unequivocal evidence.
The second is the depth of the tax database. Tax returns are generally available for extended periods and can be cross-referenced with immigration declarations, visa records, and documentation submitted to USCIS. Discrepancies between what was reported to the IRS and what was declared to immigration authorities become a natural subject of scrutiny.
Inter-Agency Data Sharing
Another vector worth monitoring is DHS’s push to expand access to tax information. The traditional separation between the IRS and other federal agencies has historically been upheld by § 6103 of the Internal Revenue Code, which protects taxpayer data confidentiality and permits sharing only in narrow circumstances.
In recent years, that perimeter has been reinterpreted. In 2025, operational cooperation agreements expanded data sharing between the IRS and ICE in specific cases, and DHS is seeking even broader access. The direction of movement is clear: tax data entering the immigration enforcement pipeline, even within existing legal boundaries.
What Makes Sense to Review
Naturalized citizens with any concern about consistency between their tax history and statements made on the N-400 stand to benefit from a preventive technical review. Several areas deserve attention:
- Tax returns from the five years preceding the naturalization application, especially when there was a subsequent amendment or IRS audit;
- Foreign account reporting, such as FBAR and Form 8938, common among naturalized Brazilians who maintained assets outside the United States;
- Any business transactions restructured after naturalization that could raise questions about the accuracy of prior declarations;
- Discrepancies between income reported to the IRS and assets declared in prior immigration petitions, such as I-140 or I-485 filings.
The Reach of the Maslenjak Decision
An important counterbalance is the Supreme Court’s ruling in Maslenjak v. United States (2017). The Court unanimously held that only false statements materially capable of influencing the naturalization decision can support criminal revocation. Errors with no causal connection to the granting of citizenship are insufficient.
This standard remains relevant even in the context of expanded enforcement. The government must demonstrate that the tax omission, if proven, was capable of altering the determination of good moral character or of material eligibility for naturalization. Arguments of this nature tend to be technical and require individualized case analysis.
The intersection of taxation and citizenship is not theoretical. In 2026, it is one of the most active fronts in federal immigration enforcement and is likely to remain so as long as the DOJ’s Civil Division maintains the policy direction established in 2025. A careful review of one’s own tax history — before it becomes the subject of proceedings — is the most effective way to mitigate the risk.
Victoria Harper
Editor-in-Chief
Leading journalism and editorial content at Visto n’ Visa, Victoria helps make immigration topics clear, trustworthy, and easy to understand. Her focus is on delivering useful, human, and relevant content for people exploring new paths abroad.
