Credit card processing and merchant services in Madison, WI
Madison sales carry 5.5%, Wisconsin's 5% plus Dane County's 0.5%. A sale inside Milwaukee's city limits carries 7.9%, so a business selling in both places needs two rates.
A taxable sale in Madison carries 5.5%: Wisconsin's 5% state rate plus Dane County's 0.5% county tax, as the Department of Revenue lists them. There's no city sales tax to add. The City of Milwaukee is the only Wisconsin municipality that has one.
That keeps Madison simple, and it also means Madison and Milwaukee can't share a tax setting. The same $120 order comes to $6.60 in tax in Madison and $9.48 inside Milwaukee's city limits, where the total is 7.9%. If you sell in both cities, or ship from one to customers in the other, confirm how the Department of Revenue says each sale should be taxed before you build your online payments checkout around a single rate.
On card fees, Wisconsin takes a hands-off line on surcharges and a protective one on discounts. There's no surcharge statute, so Visa's 3% and Mastercard's 4% caps limit a credit card fee, and debit is off limits. State law also bars card issuers from stopping you from giving a cash discount instead. The Wisconsin page has both rules and their sources.
Madison had 286,233 residents in the Census Bureau's July 1, 2025 estimate. Whether you take payments at a counter, at events or by invoice, we set up POS terminals, mobile payments and the virtual terminal, all on interchange-plus pricing. Start with a free statement review to see what you're paying now.
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Common questions
What is the sales tax rate in Madison, Wisconsin?
5.5% on taxable sales: the 5% state rate plus Dane County's 0.5% county tax. Madison has no city sales tax, because the City of Milwaukee is the only Wisconsin municipality that levies one.
Why does my Milwaukee store charge more tax than my Madison store?
Milwaukee adds more on top of the 5% state rate: Milwaukee County's tax is 0.9%, and the City of Milwaukee adds 2%, for 7.9% inside city limits. Madison's total is 5.5%. Give each store its own tax setting; our Milwaukee page has that city's details.
Can a Madison business offer a lower price for cash?
Yes. Wis. Stat. 422.422 bars card issuers from stopping a merchant, by contract or otherwise, from offering a discount to customers who pay by cash, check or similar means. Post both prices clearly. Our guide to dual pricing vs. surcharging compares a cash discount with a card surcharge.
How can a Madison vendor take cards at markets and events?
A Madison vendor can use mobile payments, either tap to pay on a phone or a mobile card reader. At an event in Dane County, taxable sales carry 5.5%. Most other Wisconsin counties also charge 0.5%, but Milwaukee County's rate is 0.9%, so check the county before you go.
Disclaimer: general information, not professional advice
This page is general educational information, not legal, tax, accounting or financial advice. Rules and rates vary by place and change, so confirm them with the official source and a qualified professional before you act. Full terms are in our Terms of Service.
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