(Illustrative image generated using artificial intelligence. This is not a real photograph of Judge Colleen Kollar-Kotelly.)
On November 21, 2025, a federal judge blocked an arrangement that would have allowed the Internal Revenue Service to share confidential taxpayer information with the Department of Homeland Security for immigration enforcement purposes, ruling that the deal violated federal tax law, public safety principles, and the privacy rights of immigrants.
U.S. District Judge Colleen Kollar-Kotelly issued the ruling after reviewing an agreement under which DHS sought access to IRS data identifying individuals it believed were living in the United States without lawful immigration status. The decision halts a key enforcement effort pursued by the Trump administration and reinforces long-standing protections surrounding taxpayer confidentiality.
Data-Sharing Arrangement Under Scrutiny
According to court filings, the Trump administration had been attempting to access tax records of immigrants by asking the IRS to disclose identifying and location information based on details provided by DHS, such as names and last known addresses. The IRS maintains sensitive personal data collected from taxpayers, including income information and residential details, which is protected under strict confidentiality provisions in the Internal Revenue Code.
In August alone, DHS requested confidential information associated with more than one million names. Immigration advocates warned that the volume and scope of the requests placed large numbers of immigrants at risk of immigration enforcement actions and deportation.
How DHS Planned to Use the IRS Data
Court records show that DHS intended to use the IRS-provided information to locate individuals for immigration enforcement purposes. Identifying details such as current or recent addresses would have allowed DHS to confirm an individual’s physical presence in the United States, update enforcement databases, and prioritize individuals for arrest, detention, or initiation of removal proceedings.
The information could also have been used to support the issuance of Notices to Appear, conduct home visits or targeted enforcement operations, and facilitate coordination between immigration enforcement units. By cross-referencing IRS data with existing DHS records, immigration authorities would have been able to refine enforcement targets with greater precision.
Critics argued that this use of tax data effectively transformed the IRS into an enforcement arm of immigration authorities, blurring long-established legal and institutional boundaries between tax administration and immigration policing.
Court Finds Violations of Law and Privacy
In her ruling, Judge Kollar-Kotelly concluded that the arrangement exceeded the legal limits governing IRS disclosures. The court found that federal tax law does not permit the IRS to share taxpayer data for broad immigration enforcement purposes and that doing so would erode core privacy protections embedded in the tax system.
The judge emphasized that taxpayers provide personal and financial information to the IRS with the understanding that it will be used solely for tax administration, not for unrelated enforcement actions. The ruling warned that allowing such disclosures would undermine voluntary tax compliance and pose broader public safety risks.
Internal IRS Concerns Raised
The court’s decision referenced internal objections within the IRS itself. IRS employees described themselves as “deeply alarmed” by the proposed data-sharing arrangement, warning that it constituted a breach of taxpayer privacy and could permanently damage trust in the tax system.
The ruling underscored that confidentiality protections are central to the IRS’s ability to function effectively and ensure widespread compliance with tax laws.
Broader Impact on Immigrant Communities
Evidence presented to the court showed that fears surrounding potential data-sharing had already contributed to a decline in tax filings within immigrant communities. Advocates cautioned that linking tax compliance to immigration enforcement would discourage individuals from filing returns, even when legally required to do so.
Immigrants contribute substantial revenue to federal, state, and local governments each year. According to estimates by the American Immigration Council, immigrant households contribute approximately $382.9 billion in federal taxes and nearly $200 billion in state and local taxes annually. Undocumented immigrant households alone are estimated to pay more than $20 billion in federal taxes and $13.6 billion in state and local taxes each year.
Decision Halts Enforcement Tool
Judge Kollar-Kotelly’s ruling blocks the IRS from implementing the data-sharing arrangement and limits DHS’s ability to use tax records as a tool for immigration enforcement. The decision reinforces long-standing legal barriers between tax administration and immigration policing and signals that taxpayer confidentiality cannot be overridden through administrative agreements.
The ruling is expected to shape future debates over the use of personal financial data in immigration enforcement and the limits of interagency information sharing.
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