Wisconsin sales & use tax.
The facts an advisor checks first — rate, nexus threshold, marketplace rules — with links to the controlling authority.
Wisconsin: rate, nexus & administration.
- State rate
- 5%
- Local rates
- County rates add 0.5%; the City of Milwaukee adds 2% and Milwaukee County 0.9%
- Economic nexus
- $100,000 in sales · effective October 1, 2018The 200-transaction threshold was repealed February 20, 2021.Controlling authority: Wis. Stat. § 77.51(13gm) ↗
- Marketplace facilitator
- Yes — effective January 1, 2020
- Streamlined (SST)
- Full member
- Administered by
- Wisconsin Department of Revenue ↗
What to watch in Wisconsin
- SaaS is generally not taxable; downloaded prewritten software is.
- Groceries are exempt; the 2024 Milwaukee city/county rate additions are recent enough to trip stale rate tables.
Rates, thresholds, and taxability change mid-year — verify against the Wisconsin Department of Revenue before advising. In L3i, every determination is cited to the controlling authority.
The Wisconsin voluntary disclosure agreement.
Behind in Wisconsin? There’s a front door. The voluntary disclosure program lets a business settle unregistered-period exposure on defined terms — before the state finds it first. The terms that shape the client conversation:
Administered by the Wisconsin Department of Revenue ↗ · also reachable through the MTC multistate voluntary disclosure program. Program terms as of February 2026 — confirm current terms before filing. L3i pairs the exposure math with the filing itself — see exposure analysis & VDA services.
Wisconsin, in brief.
What is the economic nexus threshold in Wisconsin?
$100,000 in sales, effective October 1, 2018. The 200-transaction threshold was repealed February 20, 2021. Once the threshold is crossed, remote sellers must register with the Wisconsin Department of Revenue and begin collecting.
What is the sales tax rate in Wisconsin?
The state sales tax rate is 5%. County rates add 0.5%; the City of Milwaukee adds 2% and Milwaukee County 0.9%.
Do marketplace facilitators collect Wisconsin sales tax?
Yes — marketplace facilitators have been required to collect since January 1, 2020. Direct (non-marketplace) sales remain the seller’s obligation.
How does a remote seller register for Wisconsin sales tax?
Register with the Wisconsin Department of Revenue before collecting — a remote seller must register once it crosses the economic nexus threshold ($100,000 in sales). As a Streamlined Sales Tax member state, Wisconsin also accepts central registration through the SST system, which covers all member states in one application.
Does Wisconsin offer a voluntary disclosure agreement (VDA)?
Yes — the Wisconsin Department of Revenue administers a voluntary disclosure program with a lookback of 48 months (4 years). Penalties are generally waived; interest is generally still due. An advisor can approach the state anonymously before disclosing the client’s identity.
A page tells you the rule. The platform applies it — and remembers why.
L3i runs Wisconsin determinations against a deterministic rules engine, cites the controlling authority, and captures your firm’s judgment so the next Wisconsin question starts further ahead.
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