If your February assessment notice looked higher than you expected, you are not alone. Michigan 2026 property assessment increases are running well above the long-term average in most commercial markets, and many owners are seeing double-digit jumps in assessed value. Understanding why assessors are pushing values up — and where the math breaks down — is the first step toward protecting your bottom line. This guide breaks down the statewide trend, the mechanics behind it, and what owners in Michigan should do now.
The Statewide Uplift Trend
Local assessors across Michigan set values using a two-year sales study window. The 2026 assessment roll reflects qualified sales from April 2023 through March 2025 — a stretch that captured elevated commercial transaction prices coming out of the post-pandemic rebound. As a result, assessment-to-sales ratio (ASR) studies pushed counties to apply broad Economic Condition Factor (ECF) adjustments that lifted assessed values for entire neighborhoods and property classes.
The problem is that broad ECF adjustments do not discriminate between a fully leased trophy asset and a half-vacant building next door. When assessors apply the same multiplier across a neighborhood, individual properties with weaker fundamentals end up bearing a disproportionate share of the increase. That is exactly the kind of distortion that creates strong grounds for appeal. Our guide on why property taxes increase walks through these mechanics in more depth.
How Headlee and Proposal A Interact
Michigan has two constitutional guardrails that are supposed to temper assessment spikes: the Headlee Amendment and Proposal A. The Headlee rollback requires taxing units to reduce their millage rates when the total taxable value of existing property grows faster than inflation. In theory, that should offset rising assessments. In practice, Headlee only applies to the aggregate roll — not to individual properties — and cities routinely ask voters to "Headlee override" the rollback, which restores the original millage.
Proposal A adds a second cap: a property's taxable value cannot grow by more than 5% or the rate of inflation, whichever is lower, unless the property is transferred or improved. For 2026, the inflation rate multiplier sits near the low single digits — meaning taxable value on an unchanged property should only creep up modestly. But assessed value (the State Equalized Value) can still leap upward, and that is the number you must appeal if you want to protect future years.
Why SEV Still Matters When Taxable Value Is Capped
A lot of owners assume that because Proposal A caps taxable value, there is no point challenging a higher SEV. That is a costly mistake. The moment your property changes hands, the cap resets and taxable value snaps up to equal SEV — a process called uncapping. If your 2026 SEV is inflated by $1 million, the next buyer inherits that inflated base. Read our guide to Michigan uncapping rules to understand how much a single sale can cost you.
Commercial and Industrial Are Taking the Biggest Hits
While residential assessments are rising too, the 2026 increases are most pronounced on commercial and industrial rolls. Several forces are converging. First, construction cost indices used in the cost approach climbed sharply from 2023 through 2025, inflating replacement-cost estimates. Second, assessors in industrial-heavy townships have caught up on prior-year under-assessment, producing catch-up increases on top of market-driven ones. Third, some counties have reclassified mixed-use and flex properties in ways that push them into higher valuation tables.
If you own an industrial property, pay particular attention to how the assessor handled functional and economic obsolescence. Many cost-approach valuations overstate value by failing to deduct for outdated layouts, low clear heights, or weak local demand.
County-Level Hot Spots
The sharpest 2026 increases are concentrated in a handful of counties. Genesee County owners in the Flint area are seeing particularly aggressive uplifts, while Wayne County saw aggressive ECF adjustments on industrial corridors, while Oakland County office and flex properties were hit with notable cost-approach uplifts. Owners in these markets should treat the 2026 notice as a call to action, not a formality.
Your 2026 Appeal Path
Michigan's appeal process is front-loaded and unforgiving. The first stop is the March Board of Review, and for commercial property this step is a prerequisite for escalating to the Michigan Tax Tribunal. Miss the Board of Review, and for many classes you forfeit your tribunal rights for the year. Commercial and industrial owners have a direct path to the Tax Tribunal with a firm May 31 deadline — but even then, proper documentation is non-negotiable.
For a complete walkthrough of each step, our full property tax appeal process guide covers timelines, evidence standards, and hearing procedures. And if you are still sorting out your calendar, our post on Michigan property tax deadlines for 2026 lays out every key date in one place.
What to Do Right Now
Start with the assessment notice itself. Confirm the SEV, the taxable value, and the property classification. Then compare the assessed value to recent arm's-length sales of comparable properties and to your own income statements. If the implied market value is materially below the assessor's estimate, you likely have a case. Do not wait for the summer tax bill to arrive — by then, every 2026 appeal window at the Board of Review level has closed.
At EPTA, we handle every step of the Michigan appeal process on contingency. There is no fee unless we reduce your taxes. If you are weighing your options, our guide on hiring a property tax consultant explains what to look for. The fastest way to find out where you stand is to request a free assessment review. We will pull the roll, run the numbers, and tell you whether a 2026 appeal is worth pursuing — usually within a few business days.
