Rate structure
Wisconsin's state rate is 5%; the combined state + local rate ranges from 5–7.9%. Sourcing: Destination.
COMPONENTRATENOTES
State rate5%My Tax Account general statewide rate
Local taxes5–7.9%State 5% + county 0.5% + Milwaukee city 2% / county 0.9%; stadium districts expired.
ReturnForm ST-12 + Schedule CTForm ST-12 + Schedule CT (county 0.5%) + Milwaukee County/City lines
Economic nexus threshold
You must register and collect once your Wisconsin sales reach $100,000, measured over the previous or current calendar year. There is no transaction-count threshold. 200-transaction test removed 2021-02-20. All taxable sales through a collecting marketplace → seller need not register (WI DOR). Sales made through a marketplace facilitator do not count toward the remote seller's threshold — only your direct sales do.
Where you stand: SalesTax50 tests your imported sales against this exact rule and flags Wisconsin as Approaching or Exceeded on your Nexus page —
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Filing frequency
My Tax Account assigns a filing frequency at registration based on expected tax liability and adjusts it over time. Frequencies used in Wisconsin: Monthly · Quarterly · Annual.
Due dates
Returns are due on the last day of the month following the period. When the due date falls on a weekend or holiday it moves to the next business day.
Late filing: $20 late-filing fee plus 5% negligence penalty, plus 1.5% interest per month.
Marketplace facilitator rules
Since January 2020, marketplace facilitators (Amazon, eBay, Walmart, Etsy, TikTok Shop) collect and remit Wisconsin tax on your marketplace sales. How Wisconsin treats them:
Who collects?Facilitatoron marketplace orders; you collect on direct Shopify store orders (not TikTok / Facebook & Instagram orders routed through Shopify), WooCommerce, or your own site.
Count toward nexus?Noonly your direct sales are tested against the remote-seller threshold.
Do you still file?YesYes — a registered seller still files, even for periods where all sales were through marketplaces (a zero or marketplace-only return).
How reported?DeductionDeduction if registered.
Direct salesYou collectdirect Shopify store orders, WooCommerce, your own site, invoices — you collect and remit on your return.
Filing portal & AutoFile
Wisconsin returns are filed through tap.revenue.wi.gov/mta/_. Login verification: May require verification. SalesTax50 AutoFile prepares the Form ST-12 + Schedule CT from your imported sales — you review and approve every return before it is submitted.
FAQ
Do I need a Wisconsin permit if I only sell on Amazon?
If you exceed the $100,000 threshold with your direct (non-marketplace) sales or have physical presence (including inventory in Wisconsin warehouses), yes — you must register even though Amazon collects for you.
What if I sell on Shopify and TikTok Shop?
TikTok Shop collects as a marketplace facilitator; Shopify does not. You collect on Shopify orders and report both streams on your My Tax Account return — SalesTax50 separates them automatically.
What about WooCommerce and Etsy?
Same split: Etsy collects as a marketplace facilitator; WooCommerce is your own store, so you collect on WooCommerce orders. Connect both and SalesTax50 keeps the marketplace and direct streams separate on your My Tax Account return.
Does SalesTax50 file Wisconsin returns automatically?
Yes — AutoFile prepares your Form ST-12 + Schedule CT from imported sales; you approve every return before it is submitted, and setting up your existing Wisconsin permit is included at no extra charge.
Let AutoFile handle your Wisconsin returns
Prepared and checked for you — you approve before anything is filed.
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