Loudoun budgets around a large data-center tax base—and a reserve for volatility.

Data-center land and buildings generate real-property tax. Computer equipment is taxed as business tangible personal property at the county’s general rate. Those receipts join broad local-tax and general-fund resources; they are not a dedicated pot assigned to one school, library, or fire station.

The county says the revenue has supported lower tax rates and broad services including schools, public safety, libraries, parks, human services, and capital work. That is a countywide budget relationship—not proof that any named facility paid for any named service.

Loudoun reports $1.2 billion for FY 2026 and projects $1.3 billion in the adopted FY 2027 budget. A separate FY 2025 financial report says computer-equipment personal-property tax finished $29.6 million above final budget; that is a variance for one revenue line, not total data-center revenue.

The county’s Revenue Stabilization Fund is designed to cushion within-year shortfalls in data-center property taxes. FY 2026 materials show a $119.7 million balance after a $39.7 million contribution, targeting 10% of budgeted data-center property-tax revenue.

The budget documents show scale and fiscal dependence. They do not subtract every incentive, road, utility, land-use, school, or public-safety cost, and they do not calculate a net fiscal benefit. County officials also warn that revenue growth may plateau over the next five to ten years.

The clearest public-value claim is narrower: this tax base supplies a major share of Loudoun’s general funding, and the county has created a formal mechanism to manage some of the risk.