Loudoun's data centers fund 39% of the county. Virginia booked $1.6 billion it never collected

A post that travelled through r/singularity on November 7 put a number on Data Center Alley: $1.2 billion a year in tax revenue, 39% of Loudoun County's budget, from roughly 3% of its land. The revenue half is documented by the county. The land half is a quote from an economic development official. The other side of the ledger sits in Richmond, and it is bigger.

The county published the figure, under a different label

Loudoun's own account and its 2026 data center fact sheet put data center real and personal property tax revenue at $1.2 billion in Fiscal Year 2026, 39% of the overall budget. The FY2027 adopted budget projects $1.3 billion, 40%. Read the denominator: the county says share of budget, not share of tax revenue, and the two are not interchangeable. A Loudoun County Preservation and Conservation Coalition analysis, reported by Chamber of Progress, puts data centers at 42.0% of local tax funding in 2026, up from 32.8% in 2024. Different yardstick, same trend: a county leaning on one industry for two-fifths of its money.

The 3% line has an author

The land share appears in no county document, so it should not be cited to one. It is the economic development chief's on-camera framing, and the arithmetic is plausible. It is still a quote, not a disclosure. The county's formal paperwork is more cautious. Lesson ten of the fact sheet advises spending data center revenue on capital projects and one-time costs rather than recurring expenses, "to avoid becoming reliant on a revenue stream that may change over time." That sentence was written by the government collecting the $1.2 billion.

Meanwhile, in the state's audited books

Virginia's Fiscal Year 2025 Annual Comprehensive Financial Report, flagged by Good Jobs First, discloses that the Commonwealth lost $1.6 billion in sales and use tax revenue to data centers, up 118% from the prior year's disclosure, under GASB Statement No. 77. Executive director Greg LeRoy called it a loss of spending control: "Like 35 other states, Virginia is losing control of its spending by enacting virtually automatic sales and use tax exemptions … for data center building materials and equipment." Research analyst Kasia Tarczynska noted that hyperscale campuses cost "multiple billions" while statutes still gate exemptions at $25 million to $250 million.

Two ledgers, not one

The numbers cannot be netted. One is property tax paid to a county; the other is sales and use tax a state never collected on materials and equipment, statewide. Different taxes, different governments, no subtraction available. What they share is direction and speed: both grew fast enough that the people keeping each ledger wrote the concentration down.

The viral thread was right that $1.2 billion is real. What it left out is that the same buildout shows up in Virginia's books as a cost, and a rising one.