Ontario, Wisconsin sales tax rate: 5.5%
Last updated Checked monthly
The sales tax rate in Ontario, Wisconsin is 5.5%. That’s the 5% state rate plus 0.5% in local taxes. It’s higher than 12 of the 196 Wisconsin cities we checked, and 175 other cities pay the same.
Calculated by the 
Sales Tax APIThe same engine Zamp customers use.Ontario combined rate
5.5%
- Wisconsin state
- 5%
- VernonCounty
- 0.5%
Ontario sales tax calculator
Enter a price and what you’re selling.
- WisconsinState · 5%$5.00
- VernonCounty · 0.5%$0.50
Charging this at checkout? Zamp calculates it on every order and files the returns.
Book a demoOntario sales tax rate breakdown
State and county taxes add up to 5.5%.
| Jurisdiction | Type | Rate |
|---|---|---|
| State of Wisconsin | State | 5% |
| Vernon | County | 0.5% |
| Combined rate | 5.5% |
Rate history
- July 20235.5%
- July 20245.5%
- July 20255.5%
- July 20265.5%
- Today5.5%
No change since July 2023.
Charge the right rate in Ontario, on every order.
Zamp calculates tax at each customer’s address, then files and pays every Wisconsin return for you, with a sales tax team you can call.
Ontario sales tax questions.
Still have questions? Call us at 1-866-438-9267 or email us at support@zamp.com.
What is the sales tax rate in Ontario, Wisconsin?
The combined sales tax rate in Ontario is 5.5% as of November 2, 2026. It’s made up of 5% Wisconsin state tax, 0.5% Vernon.
Does the sales tax rate vary within Ontario?
Ontario has no special-district taxes, so most addresses in the city pay the same 5.5%: Wisconsin’s 5% plus 0.5% county tax. This rate was calculated for the centre of Ontario; the calculator prices any exact address.
Is SaaS taxable in Ontario?
No.
Do online sellers have to collect sales tax in Ontario?
Yes, if they have nexus in Wisconsin: more than $100,000 in Wisconsin sales in the previous or current calendar year, or a physical presence in the state. They register with the Wisconsin Department of Revenue and charge the rate at the buyer’s address.
Sources. Wisconsin Department of Revenue · Zamp Sales Tax API, for the centre of Ontario. Rates are checked monthly and are for information, not tax advice.
Sales tax, off your plate.
Zamp registers you, calculates every order at the customer’s address, files every Wisconsin return and handles notices, with a sales tax team you can call.
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