The Dane County sales tax rate is 5.5%, made up of Wisconsin’s 5% state sales tax plus a 0.5% county tax that Dane County has collected since April 1991. That combined rate applies to most retail purchases of tangible goods and a handful of services delivered within the county.
How the Rate Is Built
Wisconsin imposes a 5% state sales tax on retail sales of tangible personal property, digital goods, and certain services.1Wisconsin State Legislature. Wisconsin Code 77.52 – Imposition of Retail Tax Dane County adds its own 0.5% county tax under state authority that lets any Wisconsin county adopt a county-level sales and use tax at that rate by ordinance.2Wisconsin State Legislature. Wisconsin Code 77.70 – County Sales and Use Taxes The Wisconsin Department of Revenue publishes the combined Dane County rate at 5.5%.3Wisconsin Department of Revenue. Tax Rates
The county half funds local services and infrastructure. When a retailer ships goods into Dane County, the delivery location determines that the 0.5% county tax applies alongside the state rate.
What You Pay Tax On
The 5.5% rate applies when you buy, lease, or rent tangible personal property in Dane County. Wisconsin defines that broadly: anything you can see, weigh, measure, feel, or touch, plus electricity, natural gas, steam, water, and prewritten computer software.4Wisconsin State Legislature. Wisconsin Code 77.51 – Definitions Clothing, electronics, furniture, and vehicles all qualify. Downloaded music, e-books, and streaming subscriptions are taxable as well.1Wisconsin State Legislature. Wisconsin Code 77.52 – Imposition of Retail Tax
Several service categories are taxable, including admissions to amusement parks, concerts, sporting events, and recreational facilities; telecommunications services and prepaid calling cards; and repair or maintenance work on tangible personal property, such as appliance or vehicle repair.5Wisconsin Department of Revenue. What Is Taxable
What’s Exempt
The biggest exemption for everyday shoppers is food. Groceries and food ingredients for home consumption are not taxed, but candy, soft drinks, dietary supplements, and prepared food are.6Wisconsin State Legislature. Wisconsin Code 77.54 – General Exemptions A box of pasta from the grocery store is tax-free; a ready-to-eat deli sandwich from the same store is not.
Medical purchases are broadly protected. Prescription drugs dispensed by a pharmacist, drugs furnished by a physician or hospital for treatment, and insulin are exempt. The same statute exempts durable medical equipment used in a person’s home, prosthetic devices, and mobility-enhancing equipment.6Wisconsin State Legislature. Wisconsin Code 77.54 – General Exemptions Most medically necessary purchases stay untaxed.
Businesses or organizations buying for an exempt purpose document it by giving the seller a completed Wisconsin Form S-211, the Sales and Use Tax Exemption Certificate. The seller keeps it on file. If the certificate isn’t fully completed, the seller must charge sales tax, and using a certificate to avoid tax actually owed carries a $250 fine per transaction.7Wisconsin Department of Revenue. Wisconsin Sales and Use Tax Exemption Certificate
Use Tax on Out-of-State Purchases
Buy something from an out-of-state seller who doesn’t charge Wisconsin tax, and you owe use tax at the same 5.5% rate. The obligation falls on you as the buyer. Individuals can report it on their Wisconsin income tax return, and you receive a credit for any sales tax already paid to another state on the same purchase.
Most large online retailers now collect Wisconsin tax at checkout. Smaller sellers, private-party sales, and items bought while traveling can still create a use tax bill that goes unreported.
Getting a Seller’s Permit
Any business making taxable sales in Wisconsin needs a seller’s permit before collecting tax. The registration fee is $20 regardless of how many locations you operate. The fastest route is the Department of Revenue’s online Business Tax Registration application, and most applicants receive an account number the same day.8Wisconsin Department of Revenue. Business Tax Registration A paper Form BTR-101 is also available.
You’ll need to provide your legal business name, Social Security Number (for sole proprietors) or Federal Employer Identification Number, business address, and a description of what you sell. The permit is valid for two years and renews automatically unless you tell the department you’ve stopped operating in Wisconsin.9Wisconsin Department of Revenue. Event Vendors
Vendors who only operate during certain months receive a seasonal permit valid for their active months each year. One-time event sellers at craft fairs still need a permit; the occasional-sale exemption is narrow and doesn’t cover most vendor situations.
Filing Returns
Once registered, you file through the Department of Revenue’s My Tax Account portal. The department assigns a filing frequency, monthly, quarterly, or annually, based on how much tax you’re expected to collect. Returns are due by the last day of the month following the reporting period. A January return is due February 28 (or 29). “Early monthly” filers must submit by the 20th of the following month instead.10Wisconsin Department of Revenue. Sales and Use Tax – Common Questions
File a return for every reporting period even when you collected no tax. Skipping a zero-dollar period counts as a failure to file.
The Retailer’s Discount
Wisconsin lets timely filers keep a small portion of the tax they remit:11Wisconsin Department of Revenue. Retailer’s Discount
- $0 to $10 in total tax: you keep the entire amount.
- $10 to $1,333 in total tax: you keep $10.
- More than $1,333 in total tax: you keep 0.75% of the total, capped at $8,000 per reporting period.
The return and payment must arrive by the due date to qualify. The discount disappears if the return is even one day late, and it applies only to sales tax collected from customers, not to use tax.11Wisconsin Department of Revenue. Retailer’s Discount
Remote Sellers Shipping Into Dane County
Out-of-state businesses selling into Dane County must collect and remit Wisconsin sales tax once their gross sales into Wisconsin exceed $100,000 in the current or previous calendar year. Wisconsin dropped the 200-transaction threshold in 2021, so only the dollar figure matters. “Gross sales” for this purpose includes taxable, exempt, and wholesale sales into Wisconsin alike.12Wisconsin Department of Revenue. Remote Sellers – Wayfair Decision
A physical presence in Wisconsin, such as a warehouse, office, employees, or stored inventory, means you must collect regardless of sales volume.
Penalties for Late Filing or Nonpayment
Costs stack up quickly when a sales tax deadline is missed:
- Late filing penalty: 5% of the unpaid tax for the first month, plus another 5% for each additional month, up to a maximum of 25%.13Wisconsin State Legislature. Wisconsin Code 77.60(4) – Interest and Penalties
- Late filing fee: a flat $20 on top of the percentage penalty.13Wisconsin State Legislature. Wisconsin Code 77.60(4) – Interest and Penalties
- Delinquent interest: 1.5% per month (18% annualized) on any unpaid balance until paid in full.13Wisconsin State Legislature. Wisconsin Code 77.60(4) – Interest and Penalties
- Fraud: deliberately filing a false return or skipping a filing to evade tax raises the penalty to 50% of the tax owed.13Wisconsin State Legislature. Wisconsin Code 77.60(4) – Interest and Penalties
A business that owes $5,000 and files three months late would face a $750 penalty (15%), a $20 fee, and $225 in interest, nearly $1,000 on top of the original bill. If you don’t file at all, the department can estimate your liability and tack on a 25% penalty on top of that estimate.
Buying a Business in Dane County
Anyone purchasing an existing business should know about successor liability. Under Wisconsin law, the buyer of a business or its assets is personally liable for the seller’s unpaid sales and use tax if the buyer doesn’t withhold enough from the purchase price to cover those taxes.14Wisconsin Department of Revenue. Successor Liability and Clearance Certificates This applies even when you only buy equipment or inventory rather than the whole operation, and a contract clause making the seller responsible for all taxes doesn’t override it.
Before closing, request a Sales and Use Tax Clearance Certificate from the Department of Revenue. The certificate confirms the seller’s tax obligations are satisfied and shields you from inheriting them.14Wisconsin Department of Revenue. Successor Liability and Clearance Certificates You can also ask the department for a summary of the seller’s outstanding balances by providing evidence of a potential sale, such as a signed offer to purchase or letter of intent.