In Michigan, the State Equalized Value on your property tax notice is exactly half of what your home is estimated to sell for on the open market. It matters because it sets the legal ceiling for how your property can be assessed, but it is not the number that produces your tax bill. That job belongs to a separate figure called the Taxable Value, which is capped by the state constitution and is often much lower than the SEV for anyone who has owned the same home for a while.
Understanding the relationship between these two numbers is the difference between reading your assessment notice correctly and overpaying for years without realizing it.
What State Equalized Value Actually Is
The Michigan Constitution requires that no property be assessed at more than 50 percent of its “true cash value,” and in practice the state targets exactly 50 percent.1Michigan Legislature. Michigan Constitution Article IX True cash value is defined in state law as the usual price the property would bring in a private sale.2Michigan Legislature. Michigan Compiled Laws 211.27 – True Cash Value Defined So a home that would realistically sell for $300,000 should carry an SEV of $150,000.
The number starts with your local assessor, who values every parcel based on recent sales, property characteristics, and local market conditions. County and state review then check whether a jurisdiction is assessing too low. If a county or local unit is coming in under 50 percent of market value, the State Tax Commission applies a multiplier to bring everything up to the required level.3Michigan Legislature. Michigan Compiled Laws Chapter 209 – State Assessment and Equalization The corrected figure is the final SEV. The purpose is statewide fairness: no township can shift tax burden onto neighbors by systematically undervaluing its properties.
Why Your Tax Bill Isn’t Based on SEV
Look at your assessment notice and you will see two key numbers side by side: SEV and Taxable Value. They move differently.
SEV tracks the real estate market. If home prices in your area jump 10 percent, your SEV rises roughly 10 percent. Taxable Value is different. Under Proposal A, passed in 1994, your Taxable Value can only increase each year by the lesser of 5 percent or the rate of inflation, no matter how hot the market gets.4Michigan Department of Treasury. School Finance Reform in Michigan Proposal A Retrospective For the 2026 tax year, the inflation rate multiplier is 2.7 percent, so that is the cap on Taxable Value growth for most properties.5Michigan Department of Treasury. State Tax Commission Memo 1 of 2026
Two rules connect the numbers. Taxable Value can never exceed SEV. And if the market drops and SEV falls below the current Taxable Value, the Taxable Value drops with it. Once the market recovers, the cap starts limiting growth again.
For long-term owners in appreciating neighborhoods, the practical result is a large and growing gap. Someone who bought in 2010 might have a Taxable Value of $120,000 while the SEV sits at $180,000. That gap is real money saved every year.
How the Tax Is Calculated
Michigan property tax is calculated from the Taxable Value, not the SEV. Local tax rates are expressed in mills, where one mill equals $1 of tax per $1,000 of Taxable Value. The formula:
(Taxable Value ÷ 1,000) × total millage rate = annual property tax
A home with a Taxable Value of $100,000 in a jurisdiction with 40 total mills owes $4,000 for the year. Total millage varies significantly across the state because school districts, counties, and special authorities each levy their own rates. Your tax bill lists the specific millage that applies to your parcel.
What Happens When You Buy a Property
The Proposal A cap protects the current owner. It does not transfer with the deed. In the year after a property changes hands, the Taxable Value resets to match the SEV.6Michigan Legislature. Michigan Compiled Laws 211.27a – Property Tax Assessment, Determining Taxable Value This is called uncapping, and it is why new buyers routinely pay much higher taxes on a house than the seller was paying the month before closing. If the previous owner had held the property for twenty years, that jump can be dramatic.
After uncapping, the annual cap starts fresh under the new owner. Going forward, Taxable Value can only rise by 5 percent or the inflation rate, whichever is smaller.4Michigan Department of Treasury. School Finance Reform in Michigan Proposal A Retrospective
Transfers That Don’t Uncap
Not every ownership change triggers a reset. Michigan law lists several transfers that are not treated as a “transfer of ownership” for tax purposes:6Michigan Legislature. Michigan Compiled Laws 211.27a – Property Tax Assessment, Determining Taxable Value
- Transfers between spouses, including creating or dissolving a tenancy by the entireties.
- Transfers from a decedent to a surviving spouse.
- Conveyances into a trust where the settlor or the settlor’s spouse is the sole present beneficiary.
- For residential property, the expiration of a life estate passing to a parent, sibling, child, or grandchild, provided the property is not used commercially afterward.
- Foreclosures or deeds in lieu, though value resets if the lender holds the property more than one year past the redemption period.
These carve-outs matter for estate planning. A family that structures ownership transitions correctly can preserve decades of capped Taxable Value. A well-intentioned deed change that falls outside the exceptions can uncap the property permanently, with no way to reverse the higher taxes.
Additions and Renovations Sit Outside the Cap
The cap applies to your existing property, not to new construction. When you build an addition, add a structure, or make substantial improvements, the assessed value of that new work is added directly to your Taxable Value outside the cap.6Michigan Legislature. Michigan Compiled Laws 211.27a – Property Tax Assessment, Determining Taxable Value The existing portion of your home keeps its capped value.
What counts as an addition is broader than most homeowners assume. Michigan courts have treated even a commercial roof replacement as new construction where the replacement was not caused by an accident or act of God. Routine maintenance like repainting or replacing a furnace generally does not trigger a reassessment, but structural work that extends the useful life of the building can. If you are planning a major renovation, ask your local assessor in advance how the work will be treated.
The Principal Residence Exemption
If you live in the home you own, you are likely eligible for the Principal Residence Exemption, which removes up to 18 mills of local school operating taxes from your bill.7State of Michigan. Principal Residence Exemption On a home with a Taxable Value of $150,000, that is $2,700 saved every year. It is the largest single property tax break available to Michigan homeowners.
You claim the exemption by filing an affidavit with your local tax collecting unit. The deadline is June 1 for the upcoming summer levy, or November 1 for the winter levy and all future levies.8Michigan Legislature. Michigan Compiled Laws 211.7cc – Principal Residence Exemption The exemption applies to only one property, and it must be your true, fixed, and permanent home. If you move out, start renting the home, or buy a second home and claim the exemption there, you have to rescind the exemption on the first. The Michigan Department of Treasury audits these claims, and a denial means back taxes plus interest.
Reading Your Assessment Notice
Michigan property owners receive their Notice of Assessment, Taxable Valuation, and Property Classification in late February or early March each year, shortly before the assessment roll is certified.9Michigan Department of Treasury. Bulletin 11 of 2025 – Property Tax and Equalization Calendar for 2026 Three things are worth checking closely:
- Is the SEV roughly half of what your property would sell for today? If it is significantly higher, you may have grounds to appeal.
- Did your Taxable Value rise by more than the inflation rate (2.7 percent for 2026)? If it did, and you have not made improvements or had an ownership change, ask the assessor to explain.5Michigan Department of Treasury. State Tax Commission Memo 1 of 2026
- Is the property classification correct? A home classified as commercial rather than residential is taxed at a higher effective rate and cannot receive the Principal Residence Exemption.
Appealing an SEV That’s Too High
If your SEV exceeds 50 percent of what your property would actually sell for, you have the right to challenge it, but the deadlines are strict and the first step controls everything that follows.
Start with the local March Board of Review. For 2026, meetings begin March 9, the second Monday in March, though some local units set alternative start dates that same week.10Michigan Department of Treasury. Bulletin 16 of 2025 – 2026 Boards of Review Confirm your local schedule with the assessor. For most residential owners, attending the Board of Review or filing a written protest by its deadline is a prerequisite for any further appeal.
Bring evidence. The strongest support is recent sales of comparable properties, ideally three to five homes similar in size, age, style, and location that sold within the past year. A professional appraisal helps, though the Board is not required to accept the appraised value. Written repair estimates support a lower valuation for a property with structural issues or deferred maintenance. Asking prices on listing sites carry no weight because they are not sales. File Petition Form L-4035 with your documentation and state clearly what you believe the true market value should be.
If the Board denies your protest, the next step is the Michigan Tax Tribunal. The petition must be filed on or before June 30 of the tax year involved.11Michigan Legislature. Michigan Compiled Laws 205.735 – Tax Tribunal Jurisdiction For the residential and small claims division, a petition postmarked by first-class mail or delivered in person by that date counts as timely. Miss it and you lose the right to a tribunal hearing for that year.
The window to challenge an assessment is narrow. Once it closes, the number on your notice becomes the number you pay against for the full year.