Property tax in Grant County, Wisconsin
In Grant County, the property tax bill comes from the Grant County Treasurer (in most municipalities your town, village or city treasurer collects the full payment or first installment). The 2026 bill is paid in 2 installments, and the next one is due January 31, 2027. You can look up and pay the bill on the county's own payment page. Taken from Grant County's own pages, checked September 23, 2026.
The median property tax bill in Grant County, Wisconsin is $2,729 a year, which is about 1.36% of the county's median home value of $200,700. That effective rate is about the same as the typical Wisconsin county (1.36%) and higher than the national median (0.81%). These are American Community Survey 5-year estimates (2024); your own bill depends on your home's assessed value and any exemptions.
Who sends the property tax bill in Grant County, and how do you pay it?
The bill comes from the Grant County Treasurer (in most municipalities your town, village or city treasurer collects the full payment or first installment). The value it is based on is set by a separate office, the assessor for your town, village or city (each municipality in Grant County values its own properties; the county does not), which is who to ask if the value looks wrong. For how to look up and pay the bill, go to the county's own payment information.
Your tax bill names the treasurer who takes the full payment or first installment. In most of Grant County that is your town, village or city treasurer; the county treasurer in Lancaster takes the second installment and any late taxes. The county's online portal is only for payments owed to the county, and in December and January it accepts current payments for just eight municipalities. The county treasurer's office is open Monday through Thursday, 7 a.m. to 4:30 p.m., and Friday, 7 a.m. to noon.
When are property taxes due in Grant County?
For the 2026 (payable 2027) bill, Grant County splits the bill into 2 payments, the first due January 31, 2027 and the last July 31, 2027. If the first installment is late, the installment option is lost and the whole unpaid balance becomes delinquent as of February 1. A late second installment makes the remaining balance delinquent as of August 1. Delinquent taxes are paid to the Grant County Treasurer and carry interest of 1% a month under state law, counted back to February 1. State law also lets a county add a penalty of up to 0.5% a month, for up to 1.5% a month in all; Grant County's published pages do not say whether it does, so ask the county treasurer before paying a late bill.
| Payment | Due | Note |
|---|---|---|
| Full payment, or first installment (paid to the treasurer named on your bill) | January 31, 2027 | January 31, 2027 is a Sunday; Wisconsin law moves a deadline that falls on a Sunday to the next business day, Monday, February 1, 2027. State law also does not treat the first installment as late if the treasurer receives it within 5 working days after January 31, and because January 31 falls on a weekend that period ends at the close of business on Friday, February 5, 2027; the payment must arrive by then. Paying in installments is allowed only when the real estate tax on the parcel is $100 or more. During December and January the county's online portal accepts payments only for the Towns of Harrison and Woodman, the Villages of Montfort, Mt. Hope, Patch Grove and Woodman, the Cities of Fennimore and Lancaster, and late taxes; the county voids and returns any other online payment in those months. |
| Second installment (paid to the Grant County Treasurer) | July 31, 2027 | July 31, 2027 is a Saturday. The Grant County Treasurer's office is closed on Saturdays, and Wisconsin law then moves the deadline to the next business day, Monday, August 2, 2027. State law does not treat the second installment as late if the county treasurer receives it within 5 working days after July 31, and because July 31 falls on a weekend that period ends at the close of business on Friday, August 6, 2027; the payment must arrive by then. The county treasurer's office closes at noon on Fridays. |
From Grant County's published schedule, checked September 23, 2026. The county had not posted a calendar labeled for this cycle when we checked, so these dates come from state law and the county's standing schedule; the date on your bill is the one that binds you.
Estimate the property tax on a home in Grant County
Enter a home's market value for a ballpark at Grant County's average effective rate of 1.36% (Census). The real bill depends on the home's assessed value, the millage where it sits and any exemptions.
Estimated property tax: $2,730 / year
Property tax in Grant County at a glance
| Measure | Value |
|---|---|
| Median annual property tax | $2,729 |
| Median home value | $200,700 |
| Effective tax rate | 1.36% |
| Typical Wisconsin county rate | 1.36% |
| National median county rate | 0.81% |
Effective rate = median real estate taxes paid divided by median home value. Source: U.S. Census Bureau, American Community Survey 5-year estimates.
How does Grant County compare in Wisconsin?
Among Wisconsin's 72 counties, Grant County has the 36th highest effective property-tax rate: 35 rank higher and 36 rank lower. That is near the middle for Wisconsin. Nationally, it ranks 515th of 3135 US counties by effective rate. See every Wisconsin county ranked.
How much do homeowners in Grant County actually pay?
The median is only the middle bill. Across Grant County's 13,935 owner-occupied homes, 42.4% pay $3,000 or more a year in property tax, 67.5% pay at least $2,000, and 5.2% pay under $800. Another 1.5% report paying no property tax at all, which usually means an exemption covers the whole bill.
| Annual bill | Homes | Share |
|---|---|---|
| Under $800 | 730 | 5.2% |
| $800 to $1,499 | 1,798 | 12.9% |
| $1,500 to $1,999 | 1,786 | 12.8% |
| $2,000 to $2,999 | 3,499 | 25.1% |
| $3,000 or more | 5,915 | 42.4% |
| No property tax paid | 207 | 1.5% |
Owners with a mortgage pay a median of $2,752 and owners without one pay $2,705. That is within 10% either way, so in Grant County paying off the house does not go with a noticeably different bill. Census table B25103.
How does the Grant County property tax bill compare with local incomes?
The median property tax bill of $2,729 is about 3.3% of the median income of Grant County homeowner households, $83,516 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 69.8% of Grant County's occupied homes are lived in by their owners; renters pay property tax too, just folded into rent.
Have property taxes gone up in Grant County?
Yes. The median bill went from $2,493 in 2015-2019 to $2,729 in 2020-2024, a 9.5% rise. Over the same span the median home value moved 35.9%, from $147,700 to $200,700. Bills rose more slowly than values, which is what assessment caps and falling millage rates do: the county is taxing a smaller share of each home's worth.
Two Census ACS 5-year periods with no survey years in common, in each period's own dollars. A change counts only if it exceeds the combined 90% margin of error.
Property tax in counties next to Grant County
Grant County borders 7 counties, 3 of them across the state line.
| County | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Jo Daviess County, IL | 1.72% | $3,613 | $209,900 |
| Lafayette County, WI | 1.57% | $3,053 | $194,500 |
| Crawford County, WI | 1.56% | $2,861 | $183,400 |
| Iowa County, WI | 1.52% | $4,038 | $265,000 |
| Richland County, WI | 1.38% | $2,735 | $197,500 |
| Grant County, WI (this county) | 1.36% | $2,729 | $200,700 |
| Clayton County, IA | 1.29% | $2,181 | $168,500 |
| Dubuque County, IA | 1.23% | $2,919 | $237,300 |
How is a home assessed in Grant County?
Wisconsin assesses homes at 100% of market value in every county, Grant County included. How Wisconsin assesses and reappraises homes.
Is there a homestead exemption in Grant County?
No. Wisconsin has no homestead exemption; owner-occupants instead see the Lottery and Gaming Credit and the School Levy Tax Credit printed on the bill. That is the Wisconsin rule, and it applies in Grant County. Wisconsin's exemptions and relief programs in full.
Grant County does not add relief programs of its own beyond the Wisconsin ones (checked September 23, 2026).
How to appeal your Grant County property assessment
In Grant County you appeal to the The Board of Review of your town, village or city. The deadline: Talk to your municipal assessor first. To appeal to the Board of Review, give the board's clerk written or oral notice that you intend to object at least 48 hours before the board's first meeting, then file a written objection within the first 2 hours of that meeting. State law sets this schedule: each board meets once a year, some time in the 45 days starting on the fourth Monday in April; check the date with your municipal clerk. How to file. Checked September 23, 2026 against the official appeal rules.
How Wisconsin's appeal process works, including the next level if the first one turns you down.
Wisconsin rules from primary state sources, reviewed September 7, 2026; sources on the Wisconsin page.
Work out your own numbers
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How much house can I afford?
Your income, debts and down payment against the 28/36 rule lenders actually use, with Grant County's tax rate to hand.
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Mortgage calculator
Monthly payment with principal, interest, tax and insurance, plus what an extra payment saves you.
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Wisconsin income tax
Brackets, standard deduction and what Wisconsin actually taxes.
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Sales tax in Grant County
The other local tax: combined state and local rate for this county.
Sources
- Median real estate taxes paid and median home value for Grant County, Wisconsin: U.S. Census Bureau, American Community Survey 5-year estimates (2020-2024), tables B25103, B25077, B25102, B25119 and B25003; the five-year comparison uses the 2015-2019 estimates. Neighboring counties: Census county adjacency file.