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A new Inspector General's report shows that as the IRS slashed its auditing ranks last year, collection of unpaid taxes fell. Karen Bleier/AFP hide caption
The IRS slashed its auditing staff last year in what was billed as a cost-cutting move, but if the effort was designed to improve the government's bottom line, it has backfired.
A new report from the Treasury Department's Inspector General for Tax Administration shows that revenue from audits plunged 35% in fiscal year 2025, meaning billions of dollars in taxes went un-collected. The drop coincides with a 27% cut in enforcement and collection staffing at the IRS, as part of Elon Musk's campaign to boost government efficiency.
"The downstream effects of these reductions are likely to become more apparent over time," the Inspector General wrote.
The IRS had beefed up its auditing ranks during the Biden administration, in an effort to collect more of the estimated $696 billion dollars in taxes that go unpaid every year, mostly as a result of people and businesses that under-report their income.
The increased staffing led to a 41% increase in audit-related revenue in 2024 — but that was largely reversed last year. More than 25,000 IRS employees were laid off or took early retirement in 2025, including about 3,600 tax examiners.
The loss in tax revenue from decreased audit activity outweighs any savings from reduced staffing at the tax-collection agency.
"Defunding the IRS is not a money-saving proposition because you have fewer employees," says Natasha Sarin, who served as a counselor on tax policy to former Treasury Secretary Janet Yellen. "It is a money-losing one, because you do a less good job of collecting taxes."
Audits generated $10 billion in tax revenue in fiscal year 2024 but that dropped to $6.5 billion in 2025.
The Inspector General notes that the overall loss of revenue could be larger, since tax audits are primarily designed to promote voluntary tax compliance by filers wanting to avoid one.
"You're less likely to speed when you know that there's a cop on the beat," says Sarin, who's now a professor at Yale Law School.
IRS Chief Executive Officer Frank Bisignano defended the agency's tax enforcement record. Bisignano told lawmakers earlier this year the agency is using technology to target its tax audits more efficiently.
The increased staffing at the IRS under the Biden administration was aimed at bringing increased scrutiny to wealthy individuals and partnerships. That fell off sharply as thousands of auditors were let go. Audits of partnerships fell 76% between 2023 and 2025.
"Disproportionately, this is about the tip-top of the [income] distribution," Sarin says. "Something like the top 1% of earners are responsible for something like a third of the tax gap."
Staffing levels at the IRS continued to decline in the first four months of the current fiscal year. The Trump administration has called for additional cuts in agency funding in 2027.
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