"Your employer will have to keep track of how many days you work in Utah, withhold Utah tax on that income, and report the Utah wages on your W-2."
That would be the ideal scenario, but don't count on it happening. Keep your own record of days worked in Utah. You'll owe the taxes regardless of whether or not your employer withholds for Utah.
Also, if your employer does not withhold Wisconsin taxes, you'll have to make quarterly estimated tax payments to Wisconsin.
https://www.revenue.wi.gov/Pages/FAQS/pcs-estpay.aspx
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
