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A group of US senators, led by Senator Elizabeth Warren, has demanded that Meta, Google, Amazon, and Microsoft provide comprehensive details regarding the tax exemptions and incentives utilized to finance artificial intelligence (AI) projects and data centers. The inquiry comes as American corporate investments in AI infrastructure reach unprecedented heights.

The lawmakers sent formal letters to the chief executives of the four tech giants, requesting full disclosure of tax deductions and exemptions tied to their capital expenditures on AI and data centers. The inquiries also sought granular details concerning the companies' lobbying efforts ahead of the passage of the US 2025 tax-and-spending package.

The move unfolds against a backdrop of intensifying debate in the United States over the economic externalities of rapid AI expansion—specifically the soaring proliferation of energy-intensive data centers, mounting strain on the electrical grid, utility rate hikes for consumers, and broader concerns surrounding labor disruption and cybersecurity.

The senators pointed out that the four companies’ federal tax payments dropped substantially despite surging revenues, as Big Tech capitalized on aggressive tax provisions and expensing incentives tied to capital investments in AI infrastructure.

According to financial filings cited in the letters, Meta paid roughly $2.8 billion in federal income taxes in 2025, down sharply from approximately $9.6 billion in 2024, despite generating comparable profits across both fiscal years.

In Meta’s case, lawmakers highlighted that the company’s capital expenditures reached approximately $72 billion over the past year, with the vast majority directed toward constructing data centers and related AI infrastructure—enabling the firm to aggressively utilize accelerated tax deduction rules.

The letters also noted that Microsoft’s current federal income tax provisions dropped by more than $11 billion between fiscal years 2025 and 2026, while Amazon’s federal income tax payments fell by roughly $8 billion between 2024 and 2025.

Similarly, Alphabet—Google’s parent company—saw its combined federal and state income tax liabilities decline by over $7 billion during the same period, according to the financial disclosures referenced by the senators.

These fiscal declines coincide with massive expansions by all four companies to build and operate hyperscale data centers to accommodate escalating AI workloads. Amazon, Meta, and Microsoft rank among the largest data center operators in the United States by active IT capacity, with Google Cloud maintaining a formidable footprint as well.

The lawmakers also raised sharp questions regarding the companies' political donations and lobbying activities leading up to the 2025 tax legislation. The letters highlighted that each of the four corporations contributed $1 million to President Donald Trump’s inauguration committee, alongside deploying millions of dollars in federal lobbying campaigns targeting Congress and regulatory agencies.

The senators gave the tech companies an October 12 deadline to provide comprehensive answers, including line-item breakdowns of tax breaks and write-offs associated with data center and AI buildouts, as well as itemized lobbying expenditures related to tax policy.

The legislative push arrives amid mounting political and public pressure over data center growth across the US, with lawmakers demanding stronger safeguards to shield households from spiking electricity bills fueled by the tech sector's surging power appetite.

Concurrently, debate continues within the Senate over proposed bipartisan frameworks designed to assist states in mitigating grid impacts and utility cost increases linked to data centers, amid ongoing disagreements over whether proposed consumer protections go far enough.