The United States Supreme Court recently ruled in South Dakota v. Wayfair, Inc., that a state can require out-of-state sellers without a physical presence in that state (i.e., remote sellers) to collect and remit sales or use tax on sales delivered into that state.
Beginning October 1, 2018, Wisconsin will require remote sellers to collect and remit sales or use tax on sales of taxable products and services in Wisconsin…
For more information visit: https://www.revenue.wi.gov/Pages/Businesses/remote-sellers.aspx