Madison apartment assessments are set by the City of Madison Assessor’s Office every year at full market value as of January 1, and the property tax bill is that assessment multiplied by a combined rate built from city, county, school district, technical college and state levies. In 2026, the assessor raised the total value of Madison’s apartment class by 9.7%, faster than the city as a whole, which means apartment owners are carrying a growing share of the local tax levy.
This guide explains how that cycle works, what the 2025 and 2026 numbers show, how the rate is calculated and what an owner can do when an assessment looks too high.
Why Madison apartment owners pay close attention to taxes
Madison is a renter-heavy city. The Census Bureau’s QuickFacts profile estimates 286,233 residents on July 1, 2025, with an owner-occupied housing rate of 46.0% for 2020–2024, a median gross rent of $1,413 and an average of 2.06 persons per household. The University of Wisconsin–Madison reported fall 2025 enrollment of 51,822.
With more than half of occupied homes rented and apartment values rising quickly, property tax is a major line in any Madison apartment budget. Wisconsin also bars local rent regulation: under Wis. Stat. § 66.1015, “no city, village, town or county may regulate the amount of rent or fees charged for the use of a residential rental dwelling unit.” That leaves owners free to set rents, but it also means property tax increases have to be absorbed or passed through in the open market.
The annual assessment cycle
Wisconsin law sets the date. Under Wis. Stat. § 70.10, “the assessor shall assess all taxable property as of the close of January 1 of each year.” Madison revalues every year. The city states that “all property is valued annually at 100% of market value as of January 1.”
For 2026, the timeline published on the city’s Open Book and appeals page ran as follows:
- Assessment notices were mailed May 1 and posted online May 2.
- Open Book, the informal review period with assessor staff, ran from Monday, May 4 to Friday, May 8 at 4:30 p.m.
- The deadline to file an objection, or notice of intent to file one, was Friday, May 15 at 4:30 p.m.
- The first Board of Review session was set for May 18.
Missing the objection deadline does not end the matter entirely, but an owner who misses it has to request a waiver from the Board of Review. In practice, an owner who wants to contest a Madison assessment needs to act within roughly two weeks of receiving the notice.
How the assessor arrives at value
Wisconsin assessors follow a ranking of evidence that the state Department of Revenue summarizes in its guide for property owners. The best indicator of market value is a recent arm’s-length sale of the property itself. Next come recent arm’s-length sales of reasonably comparable properties. Only when neither is available does the assessor turn to “other available information,” which includes the cost and income approaches.
For apartment buildings, which often trade infrequently and differ widely in size and condition, the income approach is central. That is why Wisconsin ties the right to appeal to income data. The Department of Revenue’s 2026 guide states that an owner may not appear before the Board of Review if the property was valued using the income approach “unless the owner supplies the assessor with all the income and expense information the assessor requests.”
Madison’s own filing rules reflect this. To object, owners of commercial properties must provide income and expense information under Wis. Stat. § 70.47(7)(af), and owners of 2- to 7-unit properties must submit a gross rent statement. An owner who has not kept clean, current operating statements will find it hard to contest an apartment assessment.
Why the income data carries so much weight
Under the income approach, value is estimated by dividing a property’s net operating income by a capitalization rate drawn from the market. That makes small differences in reported income or expenses meaningful. As an illustration, if an assessor’s income model overstates a building’s net operating income by $10,000 and applies a 6% capitalization rate, the value rises by about $166,700. At the 2025 Madison school district rate of roughly $18.66 per $1,000, that adds about $3,110 to the annual tax bill, every year the error stands.
The same arithmetic works in the owner’s favor when expenses are documented. Rising insurance premiums, utility costs or vacancy that the assessor has not seen will lower the indicated value only if the owner puts them in front of the assessor. Wisconsin’s Department of Revenue guide also notes that owners generally must give notice of intent to appear at least 48 hours before the first scheduled Board of Review meeting, so the documentation needs to be ready early.
Personal property no longer taxed
One item that used to appear on some apartment tax bills is gone. Wisconsin’s 2023 Act 12 created a personal property tax exemption that, according to the Department of Revenue’s Act 12 summary, applies “starting with the January 1, 2024, assessment.” For owners of furnished apartments or buildings with significant business equipment, that removed a separate assessment and bill.
What 2025 and 2026 Madison apartment assessments showed
The assessor publishes an annual property tax base report, and the apartment class has outpaced the city in both recent years.
2025
According to the 2025 property tax base report, locally assessed real estate rose 9.1%, from $44,907 million to $48,989 million. Apartments rose from $7,661 million to $8,667 million, an increase of 13.1%. Residential property overall rose 8%, and commercial property 10.9%.
2026
The 2026 property tax base report shows locally assessed real estate up 6.1%, to $51,796 million. Residential rose 4.8% and commercial 8.3%. The apartment class grew from $8,976 million to $9,844 million, up $868 million or 9.7%, across 2,210 apartment parcels. The city reported a total tax base of $51,800,472,900 and an average single-family home value of $500,300, a 3.9% increase from 2025.
The 2026 report restates the 2025 apartment total at $8,976 million rather than the $8,667 million published a year earlier, likely reflecting reclassification of some parcels. Each report is internally consistent, so year-over-year comparisons are best made within a single report.
What the trend means for the levy
Because the tax rate is set by dividing total levies by total taxable value, a class that grows faster than the city as a whole takes on a larger share of the levy. In 2026, apartments rose 9.7% while total real estate rose 6.1% and the average single-family home rose 3.9%. All else equal, that shifts part of the tax burden toward apartment owners even if the rate itself falls.
How the tax rate is built
Madison’s property tax bill combines several taxing jurisdictions: the City of Madison, Dane County, Madison Area Technical College, the school district and a state credit. The city explains on its guide to the 2025 tax bill that “the tax rate is calculated by dividing the total approved levies by the total taxable property value citywide.”
For bills issued in late 2025 and payable in 2026, a parcel in the Madison Metropolitan School District carried a net assessed value rate of 0.018656312, or about $18.66 per $1,000 of assessed value, according to the city’s parcel tax report. The city’s own component was 0.007003, or about $7.00 per $1,000.
The same city guide said the overall rate on a typical bill rose about 5.4% for 2025. The school district’s rate rose 12.5%, while the city rate fell 4.1%, the county rate fell 1% and the technical college rate fell 3.6%. The state school levy tax credit rate fell from 1.8718 mills for 2024 to 1.7285 mills for 2025, which slightly reduces the credit applied to each bill.
The school referendums behind the increase
Much of the school portion traces to November 2024, when Madison voters approved two Madison Metropolitan School District referendums. According to the district’s referendum page, the operating referendum authorized $100 million over four years and passed with 69%, and the facilities referendum authorized $507 million and passed with 72%. Together they total $607 million, and they help explain why the school rate rose while other rates fell.
A worked example
Using the 2025 rate for a Madison Metropolitan School District parcel, an apartment building assessed at $5,000,000 would carry a tax bill of about $93,280 before any special assessments or charges. If that building’s assessment rose by the apartment class average of 9.7% in 2026, to about $5,485,000, the bill at the same rate would rise to about $102,330. The actual 2026 rate will not be known until levies are set in late 2026, and parts of Madison sit in other school districts with different rates.
Credits and payment schedule
Not every credit applies to rental property. The Wisconsin lottery and gaming credit requires the owner to “own a dwelling and use it as your primary residence,” and the Department of Revenue specifically excludes rental units. Apartment buildings therefore do not receive it.
Madison offers a four-installment option. The city’s treasury page lists due dates of January 31, March 31, May 31 and July 31, and notes that the older two-installment option is no longer offered. Real estate tax bills are mailed in early December, and the city tells owners to expect them in the second week of the month.
The installments are not always equal. The city notes that the first installment is often a different amount from the others because credits and special charges are applied to it. Owners can pay more or earlier at any time, as long as the accumulated minimum is met by each due date.
Missing a payment is costly. According to the city, a taxpayer who misses a scheduled installment or pays less than the minimum becomes delinquent, loses the ability to postpone later installments, and owes the full remaining tax immediately. Interest of 1% and a penalty of 0.5% are charged for each month or portion of a month from February 1 on the outstanding balance. On a $100,000 apartment tax bill, a missed first installment could put the full balance into that 1.5%-per-month cycle.
For owners who escrow taxes through a lender, the schedule matters less; for owners who pay directly, spreading the bill over four payments smooths cash flow across the first half of the year, provided every minimum is met on time.
City housing spending and the tax base
Madison’s tax base is also shaped by the city’s own housing programs. In February 2025, the mayor’s office reported that since 2022 the city had committed $47 million from its Affordable Housing Fund and $12 million in Tax Incremental Financing funds to support the development of 2,544 new homes, about two-thirds of them with long-term affordability, and planned another $32 million over two years. New apartment buildings join the assessment roll as they are completed, which adds to the total value over which levies are spread.
When to challenge an assessment
Madison runs a two-step appeal process. Objections first go to a Board of Assessors, which the city says reviews and processes all objections under Wis. Stat. § 70.075 and “meets weekly throughout the summer and early fall.” If the owner is still not satisfied, the next step is the Board of Review, “a quasi-judicial body comprised of appointed City residents.”
A review is worth considering when:
- the assessed value is higher than a recent arm’s-length purchase price for the same building;
- the assessment rose much faster than the 9.7% apartment class average without a renovation or rent increase to explain it;
- the building’s actual net operating income has fallen because of vacancy, concessions or rising costs that the assessor may not have seen;
- the property has physical problems, such as deferred roof or mechanical work, that a buyer would price in.
In each case, the strongest evidence is the owner’s own operating statements and rent roll, which is also what Wisconsin law requires the owner to provide before appearing at the Board of Review.
A calendar for the year
Putting the dates together, a Madison apartment owner’s tax year runs roughly like this:
- January 1: the assessment date for the year.
- January 31: first installment due on the tax bill mailed the prior December.
- Early May: assessment notices arrive and the one-week Open Book period opens.
- Mid-May: objection deadline, followed by Board of Assessors and Board of Review proceedings through the summer and early fall.
- July 31: final installment due on the prior year’s bill.
- Second week of December: the new tax bill arrives, applying the new rate to the January 1 assessment.
Planning ahead as a Madison apartment owner
The practical lessons from Madison’s system are straightforward. Assessments change every year, so last year’s tax bill is a poor proxy for next year’s. The deadlines are short, so the assessment notice deserves attention the week it arrives. And because the assessor relies on income data, an owner with accurate trailing-12-month financials is in a far better position to have the assessment reflect the building’s actual performance.
Taxes also matter at sale. A buyer underwriting a Madison building will usually model the tax bill at the purchase price rather than the seller’s current assessment, since an arm’s-length sale is the assessor’s preferred evidence of value. For a state-by-state view of how property taxes and rent rules compare, see our guide to rent control and property tax by state. For more on Wisconsin markets, visit our Wisconsin market overview, and for local pricing context, see our Madison market page.
