The Wauwatosa sales tax rate is 5.9%, combining Wisconsin’s 5% state sales tax with Milwaukee County’s 0.9% county tax.1Department Of Revenue. Tax Rates Wauwatosa sits inside Milwaukee County but outside the City of Milwaukee, so the separate 2% City of Milwaukee sales tax does not apply here. That 5.9% is what shoppers see at the register and what businesses are responsible for collecting on taxable sales.
How the Rate Breaks Down
Wisconsin imposes a 5% state sales tax on most retail transactions. Milwaukee County adds 0.9% on top, a rate that rose from 0.5% to 0.9% on January 1, 2024, after the Wisconsin Legislature passed Act 12 authorizing the increase.2Wisconsin State Legislature. Milwaukee City and County Sales Taxes and Pension Reforms Informational Paper 19
The combined 5.9% applies anywhere in Milwaukee County outside the City of Milwaukee itself. Cross into a neighboring county with a lower county tax, or none, and the total changes. Retailers in Wauwatosa are personally liable for collecting the right amount, so the rate is not just a shopper’s concern.
What Gets Taxed
Most tangible personal property sold at retail is taxable: clothing, electronics, furniture, household goods, prewritten computer software, and utilities such as electricity and gas. Wisconsin also taxes several services, including telecommunications, laundry and dry cleaning, and repair or maintenance work on tangible personal property.3Wisconsin Department of Revenue. What Is Taxable
Admissions are taxable too. Tickets to sporting events, movie theaters, amusement parks, and similar venues carry the 5.9% rate unless a specific exemption applies.
What’s Exempt
Several common categories are exempt from Wisconsin sales tax, which means no state or county portion is charged.4Wisconsin State Legislature. Wisconsin Code 77.54 – General Exemptions
- Groceries. Food and food ingredients for human consumption are exempt, but candy, soft drinks, dietary supplements, and prepared food are not. A rotisserie chicken from the deli counter is taxable; a raw chicken from the meat case is not.
- Prescription drugs. Medications prescribed for a human being and dispensed by a pharmacist are exempt, along with insulin for diabetes treatment.
- Medical equipment. Durable medical equipment used in a person’s home, mobility-enhancing equipment such as wheelchairs, and prosthetic devices are exempt when used for a human being.
Nonprofits and Government
Organizations that are tax-exempt under Section 501(c)(3) can apply for a Wisconsin Certificate of Exempt Status (CES) and use it to make qualifying purchases free of sales tax. Federal and Wisconsin governmental units, including counties, cities, and school districts, also qualify. Civic organizations, chambers of commerce, fraternal groups, and social clubs do not.5Wisconsin State Legislature. Sales and Use Tax Certificate of Exempt Status Common Questions Using a CES on a purchase that does not qualify carries a $250 penalty per invoice.
Use Tax on Out-of-State Purchases
If you buy something taxable from a seller that does not charge Wisconsin sales tax, you owe use tax at the same 5.9% combined rate.6Wisconsin Department of Revenue. Use Tax This commonly comes up with smaller online retailers, mail-order catalogs, and auction sites. Individuals report use tax on their Wisconsin income tax return (Form 1 or 1NPR) or file a quarterly Consumer Use Tax Return (Form UT-5). Most large online retailers now collect Wisconsin tax automatically, but it is worth scanning receipts to be sure.
For Businesses: Seller’s Permit
Any business making retail sales of taxable products in Wisconsin needs a seller’s permit before collecting tax.7Wisconsin Department of Revenue. Sales and Use Tax Permits You apply through the Department of Revenue’s Business Tax Registration system, and a separate permit is required for each physical location.8Wisconsin State Legislature. Wisconsin Statutes 77.52(7)(a)
The registration fee is $20 regardless of how many locations you need permits for, and it also covers other Department of Revenue permits issued at the same time, such as a use tax certificate or employer registration.9Wisconsin Department of Revenue. Business Tax Registration
Filing Frequency and the Retailer’s Discount
The Department of Revenue assigns a filing frequency — monthly, quarterly, or annual — based on your volume of tax collected. Returns are filed through the My Tax Account portal.
Businesses that file and pay on time get a small retailer’s discount for the cost of collecting the tax, on a sliding scale:10Wisconsin State Legislature. Retailer’s Discount Common Questions
- $0 to $10 in sales tax reported: the discount equals the full amount of tax.
- $10 to $2,000 reported: a flat $10 discount.
- Over $2,000: total sales tax multiplied by 0.5%, capped at $1,000 per reporting period.
You lose the discount if the payment is late, if the tax owed came from a post-deadline correction, or if the tax reported is use tax rather than sales tax.
Late Filing and Payment Penalties
Missing a deadline triggers a penalty of 5% of the tax due for the first month, plus 5% for each additional month the balance is delinquent, up to 25%. A $20 late filing fee applies per return. Unpaid tax accrues interest at 12% per year from the original due date, and once delinquent, the rate rises to 1.5% per month.11Wisconsin State Legislature. Wisconsin Statutes 77.60(4) An intentionally false return can bring a 50% penalty on the entire tax owed.
Remote Sellers and Marketplaces
Out-of-state sellers must register and collect Wisconsin sales tax once their gross sales into Wisconsin exceed $100,000 in the current or previous calendar year.12Wisconsin Department of Revenue. Remote Sellers Common Questions Wisconsin has no separate transaction-count threshold; the dollar figure is the only trigger, and sellers below it in both years qualify for the small seller exception.
Marketplace facilitators such as Amazon, Etsy, and eBay have their own obligation. A facilitator that lists products, processes payments, or assists with shipping for third-party sellers must collect and remit Wisconsin sales tax on those sales, a rule in effect since January 1, 2020.13Wisconsin Department of Revenue. Marketplace Provider Common Questions If you sell through one of these platforms, the tax is usually handled for you, but confirm it rather than assume.