The conclusion of the tax filing season Tuesday is about to provide early clues toward resolving a nagging question hanging over the U.S. Treasury: How honest will Americans be about their income when there are suddenly fewer auditors to check them?
The answer has ramifications extending from Treasury debt markets already embroiled in tariff-related turmoil to legislative struggles in Washington over the debt ceiling and a proposed new round of tax cuts.
A drop in tax collections would likely move forward a debt ceiling deadline from the August to September timeline forecast by the non-partisan Congressional Budget Office. A sharp falloff also could ratchet up concerns about the fiscal burden of a proposed Republican tax package that matches giant tax cuts with much smaller spending reductions.
President Donald Trump’s administration this year terminated more than 7,000 Internal Revenue Service employees, mostly involved in tax enforcement, and ultimately may cut the agency’s workforce by 25%.
Analysts have warned that will drive up tax avoidance as well-off taxpayers’ fear of audits eases, though it’s not clear how quickly or how much.
There are early signs tax collections are holding up this year anyway. Through March, gross U.S. budget receipts for the fiscal year were up 3% to $2.26 trillion, according to the Treasury Department.
“That seems to suggest we may have a robust tax filing season in terms of revenue,” Deputy Treasury Secretary Michael Faulkender said on Bloomberg Television Friday.
There are lingering doubts raised by IRS filing statistics. As of April 4, the IRS saw a 0.4% reduction in the number of returns received compared to the 2024 season. The dollar value of refunds was up 5%, higher than the inflation rate.
“A major area of concern is wealthy taxpayers who don’t file when it’s clear that the IRS audit rate is low,” said John Koskinen, a former IRS commissioner. “The non-filers tend to be concentrated in wealthier individuals so they represent more significant revenue loss on an individual basis.”
Jessica Riedl, a senior fellow at the Manhattan Institute, said it will probably take longer for receipts to drop because the tax season was already underway when the IRS layoffs began.
“The short-term effects will likely be muted because the tax filing season is nearing an end,” she said. “However, the revenue loss may begin spiking this summer when corporations file their next quarterly taxes, and then rise further by next year’s tax season.”
Even so, voluntary tax compliance was a high 85% in 2022, according to the IRS.
“I’m not immediately convinced that there’s going to be some dramatic falloff in compliance right now,” said Pete Sepp, president of the National Taxpayers Union.
Future years could be very different. The Yale Budget Lab forecast that laying off about 18,000 IRS employees would result in a net revenue loss of roughly $159 billion over ten years. That could rise to as much as $1.6 trillion over 10 years if noncompliance is high, the group said.
Vanessa Williamson, a senior fellow at the Brookings Institution, said the Trump administration cuts are largely undoing efforts by former President Joe Biden to audit those making more than $1 million per year. She said the IRS could return to its footing in the 2010s when enforcement was lax and audits of those individuals dropped by 70%.
“It could easily become a $100-billion-a-year problem,” she said, noting the IRS high-wealth unit lost 38% of its employees.
A recent change allowing the agency to share taxpayer data with immigration officials could also result in a further loss of $313 billion in the coming decade if that discourages migrants from paying taxes out of fear of deportation, according to the Yale Budget Lab.
Treasury market
Wall Street investors and strategists are closely monitoring the magnitude of this week’s tax collections amid the sharp swings in the bond market driven by the Trump administration’s trade war.
In the near-term, the amount of cash flowing out of the money markets to pay Uncle Sam will impact funding costs. Higher tax receipts for the federal government means more liquidity is drained from the overall financial system, likely pushing up the cost of borrowing in the overnight repurchase market — which was already strained by last week’s market chaos.
Wells Fargo strategists, who estimate that this April’s tax receipts will boost the Treasury’s General Account by as much as $300 billion, last week flagged the risk of higher repo rates amid the tax payments.
Looking further out, the market is focused on what the April tax receipts mean for the Treasury’s cash balance in light of the debt ceiling. Wrightson ICAP, for one, forecast last month with low conviction an 11% increase in non-withheld income tax collections in the April to May period, compared to last year.
The amount coming into the Treasury’s coffers also carries implications for the Federal Reserve’s balance sheet unwind, which on April 1 slowed to a cap of $5 billion in Treasuries per month. Officials are closely watching the level of reserves in the banking system and gauging broader financial liquidity to determine how much longer the quantitative tightening process can continue.
Customer service
Businesses have other reasons for concern about the IRS layoffs, including greater difficulty getting advice from the agency on complex tax questions.
“The old adage ‘if you break it, you’ve bought it’ applies here,” Sepp said. “They’re doing the breaking right now, so they own the problem.”
Sepp said the NTU is very concerned about deep coming cuts to the office of the Taxpayer Advocate — an internal means for taxpayers to challenge IRS decisions — and the risk of further delays in efforts to modernize the agency’s creaky data systems.
It’s unclear, he said, if Elon Musk’s Department of Government Efficiency is going to scrap the modernization effort and start over.
For businesses with complex tax problems, proposals to employ artificial chatbots instead of humans could be especially problematic, said Daniel Reck, a University of Maryland economics professor who researches tax policy.
“That could turn into a pretty Kafkaesque experience, and it’s already not a lot of fun,” said Reck.