The Wisconsin data center sales tax exemption lets a WEDC-certified facility buy servers, networking gear, cooling and power equipment, construction materials, and even electricity without paying the state’s 5% sales and use tax. The exemption was created by 2023 Wisconsin Act 19 and is codified at Wis. Stat. ยง 77.54(70). To qualify, the operator has to commit to a minimum capital investment of between $50 million and $150 million, depending on the population of the county where the facility sits, and hit that number within five years of certification.
Investment Thresholds by County Population
The “$150 million data center exemption” shorthand you often see is only accurate for the largest counties. Wisconsin scales the minimum qualified investment to county size:
- Counties over 100,000 residents: $150 million in eligible costs within five years of WEDC certification.
- Counties with 50,001 to 100,000 residents: $100 million within the same five-year window.
- Counties with 50,000 or fewer residents: $50 million within five years.
When a data center spans buildings in more than one county, the threshold matches the most populous county involved.1Wisconsin Department of Revenue. Sales and Use Tax Exemption for Qualified Data Centers 2114 The tiered structure is a deliberate push toward rural development. A project in Dane County faces the $150 million bar; a project in a smaller county like Langlade can qualify at $50 million. Check the county population figures before you commit to a site, because the difference between the $100 million and $150 million tiers can decide whether a project pencils out.
What Counts as a Qualified Data Center
WEDC certifies a facility as a “qualified data center” when it consists of one or more buildings, or an array of connected buildings, owned, leased, or operated by the same business entity or its affiliate. The buildings must be constructed or renovated specifically to house networked server computers that centralize data processing, storage, management, retrieval, or communication.1Wisconsin Department of Revenue. Sales and Use Tax Exemption for Qualified Data Centers 2114 A single warehouse converted for colocation racks can qualify, and so can a campus of interconnected buildings under one entity’s control.
The WEDC certification date starts the five-year investment clock and opens the window on the tax exemption. Both at once. Purchases made before the certification date are not exempt, even if the facility later qualifies. Developers who begin procuring equipment during early construction, before WEDC has signed off, lose the exemption on everything bought in that gap.
Purchases Covered by the Exemption
Once certified, the exemption reaches a broad category of tangible personal property used exclusively for developing, constructing, renovating, expanding, repairing, or operating the qualified data center. The property has to be used solely at the certified facility. The Department of Revenue’s guidance groups the covered items this way:
- Computing and networking hardware: server equipment and chassis, networking equipment, switches, racks, fiber-optic and copper cabling (including cabling connecting multiple qualified data centers), trays, and conduit.
- Power infrastructure: substations, uninterruptible energy equipment, fuel piping and storage, switchboards, batteries, and backup generation equipment.
- Cooling systems: chillers, refrigerant piping, adiabatic and free cooling systems, cooling towers, water softeners, air handling units, indoor direct exchange units, fans, ducting, and filters.
- Operational supplies: monitoring equipment, security systems, testing equipment, modular data centers and preassembled components, and electricity itself.
Electricity is the easy one to miss. Power purchased for a qualified data center is exempt from sales tax, and power is typically the single largest ongoing operating cost of running one.1Wisconsin Department of Revenue. Sales and Use Tax Exemption for Qualified Data Centers 2114
Construction contractors are covered too. Building materials sold to a contractor working on a qualified data center project are exempt when the materials are used in construction, renovation, or expansion of the facility. The exemption flows through the supply chain, so the data center operator does not have to purchase every item directly.
How to Claim the Exemption at the Point of Sale
Claiming the exemption on a purchase means giving your supplier a completed Wisconsin Sales and Use Tax Exemption Certificate. The Department of Revenue accepts two forms:
- Form S-211: check the box for “other exemptions provided by law” and write in “qualified data center” followed by the name of the certified facility.
- Form S-211E: check the box for “Qualified Data Center” and enter the facility name.
Both the buyer and the supplier should keep copies. The supplier relies on the certificate to justify not collecting tax, and the buyer needs it if the Department of Revenue audits the transaction.2Wisconsin Department of Revenue. Qualified Data Center Exemption Contractors buying materials for the project follow the same process. The certificate works at each level of the supply chain, so a general contractor and its subcontractors each present the form to their vendors.
Getting Certified by WEDC
Applications go to WEDC, not to the Department of Revenue. WEDC evaluates whether the proposed facility meets the statutory definition, whether the investment plan is realistic within five years, and the project’s broader economic contribution to the surrounding community.3Wisconsin Economic Development Corporation. Data Center Sales and Use Tax Exemption Program Guidelines The certification itself has to include a description of the geographic location and buildings, the certification date, and identification of the business entity.1Wisconsin Department of Revenue. Sales and Use Tax Exemption for Qualified Data Centers 2114
Prepare detailed financial projections that break down eligible costs by category: computing hardware, power infrastructure, cooling, construction, and other qualifying property. The stronger the documentation behind the investment timeline, the smoother the review. WEDC updates its program guidelines annually, so check the current year’s version before submitting.4Wisconsin Economic Development Corporation. Data Center Sales and Use Tax Exemption
What Happens if You Miss the Five-Year Investment Target
The five-year clock is firm. If a certified data center does not reach its minimum qualified investment within five years of the WEDC certification date, the operator can lose its exempt status. Purchases that were made tax-free during the certification period may then be subject to back taxes and interest. Keep detailed ledgers that track expenditures from day one; the Department of Revenue can review whether actual spending matches the projections WEDC relied on when granting certification.
Projects slip for ordinary reasons: supply chain disruptions, permitting delays, corporate strategy shifts. If the timeline starts slipping, do not assume you will catch up on your own. Monitor cumulative spending against the five-year target and consider whether supplemental investments can close any gap before the deadline arrives.
What the Exemption Is Worth
Wisconsin’s state sales tax rate is 5%.5Wisconsin Department of Revenue. DOR Tax Rates Most counties also impose an additional 0.5% county sales tax, and some areas carry a stadium district or other special tax. On a $150 million qualified investment, the 5% exemption alone is worth $7.5 million. County taxes exempted on top of that add more. For a multi-hundred-million-dollar campus, the cumulative relief over the life of the facility reaches well into eight figures once recurring purchases like electricity are counted in.