Meta Called Its AI Data Centers Experiments and Saved $3.9 Billion
By treating AI data halls as research pilot models, Meta became the biggest user of a 1981 innovation tax credit, and its own filings show how much it is bracing to give back.
In January 2025, Mark Zuckerberg told investors that Meta's new data centers would "drive our core products and business." On its federal tax return, Meta has been describing the same buildings very differently: as experiments. According to a New York Times investigation published this week, Meta has been classifying its AI data centers as "pilot models" under the federal research and experimentation tax credit, a move that lets the Nvidia chips inside them count toward a break designed to reward invention, not routine operations.
The payoff has been steep. Per the Times' review of securities filings, Meta's savings from the research credit rose from $700 million in 2023 to $2 billion in 2024 and $3.9 billion in 2025. That makes Meta the largest beneficiary of the credit among publicly traded companies, and, by the Times' count, more than 10% of the credit's entire $32.1 billion cost to the Treasury last year.
How a server rack becomes a prototype
The research credit, created in 1981 and codified in Section 41 of the tax code, lets companies claim a portion of qualified research spending: wages for people doing research, contract research, and supplies used up in the process of experimentation. It has always applied to prototypes. A company building a new kind of engine can count the materials that go into the test article.
Meta's argument, as the Times describes it, is that its AI data centers are that test article. Starting in late 2024, the company began drawing a tax distinction between chips bound for AI data centers and chips bound for its ordinary facilities. The AI halls became "pilot models," and the hardware inside them, by The Decoder's account of the Times report, was treated as experimental materials. Meta's position rests on the idea that the rack layouts, networking configurations and cluster designs are themselves unproven, and that building them is research.
Tax specialists are skeptical. Andre Shevchuck, a partner at the advisory firm BPM who specializes in the credit, told the Times that describing data centers as experimental facilities is "kind of wild and out there." The IRS has historically resisted applying the credit to proven and commercially available equipment, and an Nvidia accelerator bought by the tens of thousands is about as commercially available as computing hardware gets.
The tension with Meta's public messaging is plain. The company has described its Prometheus and Hyperion clusters as the backbone of its AI products, with Hyperion designed to scale to 5 gigawatts. On the tax side, those same facilities are framed as pilots.
The reserve tells the story
Meta's own accountants appear to share some of the doubt. Companies must set aside reserves for tax positions that might not survive an audit, and Meta's reserve for uncertain tax positions has grown 45%, from $12.9 billion to $18.74 billion, according to the Times. The filings name "uncertainties with our research tax credits" as the main driver.
That reserve is not a prediction that Meta will lose. It is an acknowledgment that the position is aggressive enough that the company cannot count on keeping all of the benefit. The IRS has not publicly rejected the data-center claims, and any audit of 2024 and 2025 returns could take years to resolve.
The research credit is not Meta's only open front with the agency. The Times also detailed a roughly $355 million dispute over whether $4.1 billion in stock options granted to Zuckerberg could be counted as deductible research costs, and a separate long-running fight over profits the IRS says were improperly routed to the Cayman Islands.
Meta defends the approach as ordinary use of the law. "Meta is one of the largest investors in research and development in the United States," spokesman Andy Stone told the Times. "Like other companies that invest at this scale, we use the tax incentives Congress established decades ago."
The man who introduced the credit sees it differently. Former congressman James Shannon, who sponsored the 1981 legislation, said the use has "gone way, way beyond what anybody could have imagined," per The Decoder's summary of the Times report.
Washington is already asking
The timing is awkward for Meta. On September 28, Senator Elizabeth Warren and five colleagues, Elissa Slotkin, Jeff Merkley, Bernie Sanders, Richard Blumenthal and Tina Smith, sent letters to the chief executives of Meta, Alphabet, Amazon and Microsoft demanding an accounting of the AI and data-center deductions they have claimed under the One Big Beautiful Bill Act passed in 2025. Responses are due October 11.
The letters, according to Warren's office, cite a nearly $7 billion drop in Meta's federal tax expense from 2024 to 2025 while its pre-tax income rose by more than $15 billion. Microsoft's federal tax expense fell by more than $11 billion between fiscal 2025 and fiscal 2026. The lawmakers' focus is the 2025 law's expensing provisions, but the Times investigation hands them a second line of questioning: whether a decades-old innovation credit is now subsidizing the AI buildout as well.
What it means for the rest of the industry
If Meta's interpretation holds, it becomes a template. Every hyperscaler and neocloud building GPU clusters could argue that its next-generation hall is a pilot model, and the research credit, which already costs tens of billions a year, would turn into a large subsidy for data-center capital spending. The Decoder reports that EY, which helped Meta structure the approach, is now marketing it to other companies.
If it fails, Meta faces a bill it has already partly reserved for, plus interest, and the precedent closes off the route for everyone else. Either way, the outcome will be set in IRS audits and possibly Tax Court, not in Congress, unless lawmakers decide to tighten the definition of a pilot model themselves.
For now, the most useful number is the gap between the two Metas: the one telling shareholders its data centers are the core of the business, and the one telling the IRS they are experiments. The $18.74 billion reserve is the company's own estimate of how wide that gap might be.