Wisconsin sales tax for contractors
What we found on official Wisconsin government pages about sales tax and tax setup for contractors. Each line shows its source and the date it was read. This is general information, not tax or legal advice. Rules change: verify with your CPA before you rely on any of it.
State sales tax rate
5% state; +0.5% county tax in adopting counties (0.9% Milwaukee Co., City of Milwaukee 2%); 0.1% stadium district in some counties (page text; Pub 200 dated 2017 for stadium)
Source: https://www.revenue.wi.gov/dor%20publications/pb201.pdf. Last verified 2026-11-02.
Filing and due dates
Default quarterly; DOR may require monthly/annual; due last day of month after period; due 20th if liability >$3,600/quarter (notified in writing); Form ST-12 (consumer use certificate holders); portal My Tax Account; e-file required
Source: https://www.revenue.wi.gov/dor%20publications/pb201.pdf. Last verified 2026-11-02.
What this page does not cover
Local taxes, special districts, and any detail we could not confirm on an official page are left out on purpose. Confirm current rates, forms and due dates with the state agency and your CPA.
How BossHours helps
BossHours keeps your quotes, invoices and job records in one place so your accountant has what they need at filing time. It does not give tax or legal advice.
See also the contractor guides and free tools.
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