If you own a home in Michigan, or you are about to buy one, you have probably asked some version of the same question: why did my property taxes go up in Michigan? The answer is not just “because home values rose.” In Michigan, property taxes are shaped by a specific system built around Proposal A, annual assessment rules, taxable-value caps, and a major reset called uncapping when a property changes ownership.
That is why two neighbors living in similar houses can have very different tax bills, and why many buyers get shocked after purchasing a property. Michigan does not simply tax you on whatever your house last sold for. Instead, it uses a layered system involving assessed value, state equalized value (SEV), taxable value, and local millage rates.
How Proposal A works
Michigan’s modern property-tax structure comes from Proposal A of 1994. The key feature most homeowners care about is this: for existing owners, a property’s taxable value usually cannot rise each year by more than 5% or the rate of inflation, whichever is lower, unless there were additions, losses, or certain other changes. For the 2026 assessment year, the official inflation multiplier is 1.027, meaning a normally capped property’s taxable value can rise by 2.7% before additions and losses are factored in.
That cap is one reason many long-time Michigan homeowners have tax bills that rise more slowly than market prices. Even if market value jumps sharply, taxable value may still rise only by the inflation cap. Michigan Treasury’s property-tax report explains that Proposal A shifted the system so taxable value, not just market-based assessed value, became central to the tax bill.
The basic formula homeowners need to understand
Michigan assessors determine a property’s assessed value, which is generally 50% of true cash value, or market value. The state equalized value is essentially the county-equalized version of that same 50% benchmark. But your actual tax bill is usually based on taxable value, not SEV. Then the taxable value is multiplied by your local millage rates to produce the bill.
That distinction matters because a homeowner can see a big jump in estimated market value on an assessment notice without seeing the exact same percentage jump in taxes. On a capped property, taxable value may rise much more slowly than SEV.
Why property taxes “uncap” after a sale
This is the part that surprises buyers the most.
Under Michigan law, a transfer of ownership generally causes the property’s taxable value to uncap in the calendar year following the transfer. When that happens, the tax base resets upward toward the property’s current SEV instead of staying at the seller’s previously capped taxable value. That is why a buyer’s future taxes can be dramatically higher than the seller’s current taxes on the same house.
Michigan Treasury is also very clear about one related point: assessors may not automatically set assessed value or taxable value at exactly half the sale price. In other words, Michigan is not supposed to just “follow the sale” mechanically. But a sale still often triggers a substantial future tax jump because uncapping removes the old capped taxable value.
So when people search property tax uncapping Michigan, that is usually what they are running into: they bought a home, and the next year’s taxable value jumped because the old owner’s cap no longer protected the parcel.
Why Michigan property taxes are rising even for people who did not sell
There are several reasons a homeowner’s tax bill can still increase even without a sale.
First, capped taxable value is still allowed to rise annually by inflation, up to the constitutional limit. For 2026, that official cap factor is 2.7%.
Second, new construction and additions are not protected the same way as existing capped value. If you build an addition, finish major improvements, or add taxable new value, that can raise the bill beyond the normal capped increase. Michigan’s capped-value formula expressly accounts for additions and losses.
Third, local millage rates can change. Michigan’s property-tax estimator explains that taxes depend not only on value, but also on the applicable local millages. Those can differ significantly by municipality and school district.
Fourth, if a property is not a principal residence, the tax burden can be materially higher. Michigan Treasury says non-homestead property, such as rental homes, businesses, or vacation homes, is generally subject to a local school operating levy of up to 18 mills, while homestead property is treated differently.
Why rising home values still matter
Even though Michigan does not directly tax every owner on full current market growth each year, rising home values still matter a lot.
Higher market values push up assessed value and SEV, and when a property sells, that higher SEV becomes crucial because uncapping can reset taxable value closer to that current level. That is one reason recent appreciation in Detroit, the suburbs, and parts of West Michigan has translated into future tax surprises for buyers, even when long-time owners were relatively protected by the cap.
Detroit’s 2026 assessment announcement is a good real-world example. The city said residential property values rose by roughly $500 million and that many neighborhoods saw double-digit value gains, while also emphasizing that taxes on capped parcels remain limited by Michigan’s tax-cap rules.
Michigan property tax rates: how high are they?
At the state level, Michigan is not the very highest property-tax state in the country, but it is still relatively high. Tax Foundation’s 2025 map, using 2023 owner-occupied housing data, puts Michigan’s effective property tax rate at 1.15%, ranking 14th highest among the states.
Michigan Treasury’s own 2022 property-tax report also shows why many owners feel the burden: the statewide average millage rate across all property in 2022 was 41.73 mills, with homestead property averaging 35.59 mills and non-homestead property averaging 52.95 mills.
Which Michigan counties have the highest effective property taxes?
Because local millages and home values vary so much, effective tax rates can differ sharply by county.
A recent Rocket Mortgage summary using 2023 effective tax-rate data lists the top five Michigan counties as Ingham County (1.86%), Wayne County (1.64%), Bay County (1.63%), Saginaw County (1.57%), and Washtenaw County (1.56%). Tax Foundation’s county-level data shown in search results also supports Wayne, Saginaw, and Washtenaw being among Michigan’s highest effective-tax counties.
That does not mean every city in those counties has identical tax pressure, because Michigan tax bills are ultimately driven at the local-unit and school-district level. But it does show that buyers should not treat “Michigan property tax rates” as a single statewide number.
Why first-time buyers get hit the hardest
The people most likely to be shocked are often first-time buyers.
That is because online listings, public tax records, and seller disclosures often show the seller’s current tax bill, which may reflect years of capped taxable-value growth. After purchase, the property can uncap and the buyer’s next bill can be much higher. Michigan Treasury specifically provides a Property Tax Estimator so buyers and owners can estimate taxes and compare millage rates before they buy.
So if someone is moving to Michigan, upgrading homes, or buying an investment property, the right question is not “What are the taxes right now?” The right question is “What could the taxes become after uncapping?”
What buyers should calculate before purchasing
Before buying a Michigan home, you should look at five things.
First, check whether the property will remain a principal residence or become non-homestead, because that can change the school-operating tax treatment.
Second, estimate what taxes could look like after uncapping, not just what the seller currently pays.
Third, review the property’s current taxable value and compare it with its SEV. A large gap can signal a larger post-sale increase. That follows directly from how Proposal A caps taxable value until a transfer occurs.
Fourth, remember that improvements and additions can increase taxable value beyond the ordinary cap.
Fifth, use Michigan’s official Property Tax Estimator and local millage-rate database before closing.
Final verdict
Michigan property taxes are rising for a mix of reasons, but the biggest ones are straightforward: Proposal A still allows annual capped increases, home sales trigger uncapping, home values have risen in many markets, and local millages vary widely.
That is why the phrase Michigan reassessment property taxes confuses so many homeowners. In Michigan, reassessment does matter, but the real tax story usually comes down to the relationship between SEV, taxable value, and uncapping after transfer.
For homeowners, the takeaway is simple: rising tax bills are not random. For buyers, the lesson is even simpler: never underwrite a Michigan purchase based only on the seller’s current tax bill.
