UNDERSTANDING TAX INCREASES

Why Your Commercial Property Taxes Keep Going Up

Your property didn't improve, so why did your taxes increase? Here are the real reasons — and what you can do about it.

THE REAL REASONS

5 Reasons Your Commercial Property Taxes Are Rising

Mass Appraisal Methodology

Assessors use mass appraisal models that apply broad assumptions to your property. They don't account for your specific condition, vacancy, or income.

Market-Wide Assessment Increases

When property values rise in your area, assessors increase assessments across the board — even if your property's value hasn't kept pace. Retail Property Tax Appeals are especially common when market-wide increases don't reflect individual property performance.

Uncapping After Sale (MI)

In Michigan, Proposal A caps annual tax increases — until the property sells. After a sale, the taxable value 'uncaps' to the full assessed value, causing a major tax jump.

Reappraisal Cycles

States conduct periodic reappraisals (every 3-6 years in Ohio). These resets can sharply increase your assessed value based on broad market trends.

Failure to Appeal

The single biggest reason owners overpay: not appealing. If you don't challenge your assessment, it stands — and becomes the baseline for future years.

HOW ASSESSMENTS WORK

Your Assessment Doesn't Reflect Your Property's Reality

County assessors use mass appraisal methods to value thousands of properties at once. These models rely on broad market data, standard assumptions, and limited property-specific information.

The result? Your assessment may not reflect your actual vacancy rate, your declining rental income, your deferred maintenance, or the specific challenges your property faces.

That gap between what the assessor thinks your property is worth and what it's actually worth is where your overpayment lives — and where a property tax appeal can deliver real savings. Learn more about how commercial properties are assessed.

Commercial property owner reviewing rising tax assessment documents

ARE YOU OVER-ASSESSED?

Signs Your Assessment May Be Too High

Not sure if your property is over-assessed? Look for these warning signs. If any apply, gather your Property Tax Appeal Evidence and request a Free Property Tax Review.

Vacancy higher than market average

NOI declining year over year

Recent comparable sales below your assessed value

Property condition issues not reflected in assessment

Taxes increased without any improvements to the property

YOUR CHOICE

Appeal or Accept — The Difference Adds Up

Appeal Your Assessment

Assessment corrected to reflect actual market value

Tax savings that compound year over year

Stronger position for future assessment cycles

Protected cash flow and property value

Accept the Assessment

Overpay taxes based on inflated assessment

Losses compound every year you don't appeal

Future assessments build on the inflated baseline

Cash flow erodes, reducing overall property value

Most commercial property tax increases are driven by things that have nothing to do with your specific building — market-wide mass appraisal updates, millage rate changes, reassessment cycles, and assumptions about income and cap rates that shift from year to year. Assessors rarely visit individual properties, so they rely on broad data that can miss declining occupancy, deferred maintenance, or unfavorable lease terms. The result is that many owners see taxes rise even as their actual cash flow is flat or falling. Our guide on assessed value vs market value explains exactly how that disconnect opens up. A closer look at how assessors value commercial property shows where these disconnects usually live.

It depends on the state. Michigan caps annual taxable value increases for existing owners at the lesser of 5% or inflation under Proposal A, but that cap disappears the year after a sale — a rule known as uncapping. Our post on 2026 Michigan assessment increases shows how large this year's inflation-driven cap looks in practice. Indiana uses a 3% constitutional circuit breaker cap on commercial property tax liability, but the underlying assessed value can still rise significantly. Ohio has no statewide cap at all — reappraisal and triennial update cycles can produce large swings. That's why a jump in one state can look very different from a jump in another.

Not always, but in practice they usually do. When market values rise in your area, assessors typically raise assessments across the board, and local governments often keep millage rates steady rather than rolling them back — which means your bill goes up even if your own property has not improved. For retail, office, and industrial owners, that disconnect between headline market trends and actual property performance is where over-assessment lives. An appeal is the mechanism for closing that gap.

Technically the legal appeal right usually belongs to the titled owner, but in many triple net lease structures the tenant bears the economic burden of property taxes and has a direct interest in reducing them. Some leases explicitly require or allow tenants to initiate or fund appeals on behalf of the landlord, especially for large single-tenant industrial or retail buildings. If you are on either side of a NNN lease, it is worth reviewing the tax provisions carefully — our triple net lease tax guide explains how these rights typically work in MI, IN, and OH.

Start by comparing your assessed value to three things: recent comparable sales in your market, your actual trailing income and expenses, and cap rates investors are currently paying for properties like yours. If any of those three produces a number meaningfully lower than the assessor's value, you likely have an appeal. A quick free property tax review lets us run that comparison for you at no cost and tell you whether the increase is defensible or worth fighting. For do-it-yourself owners, our evidence guide explains exactly what to look at.

A successful appeal resets your baseline, which matters more than the one-year savings. Future mass appraisal increases, trending factors, and reappraisal cycles are all applied on top of your current assessed value, so lowering it now compounds over every future year you own the property. Owners who never appeal end up stacking year after year of increases on top of an inflated base. Our appeal process guide covers exactly how to get that reset started.

RELATED RESOURCES

More Property Tax Appeal Resources

How to Appeal Commercial Property Taxes — Step-by-step guide

How Commercial Properties Are Assessed — Understanding assessment methods

2026 Property Tax Appeal Deadlines — Filing dates for MI, IN, and OH

Michigan Property Tax Appeals — Tax Tribunal representation

Ohio Property Tax Appeals — Board of Revision representation

Office Property Tax Appeals — Office buildings and commercial space

SELECT YOUR STATE

Find Your State's Appeal Process

Property tax appeal procedures vary by state. Choose your state below for a detailed guide to the appeal body that handles your commercial property tax appeal.

Michigan

Tax Tribunal

Michigan's statewide tax appeal body. Strict May 31 / July 31 filing deadlines depending on property type.

Michigan Tax Tribunal

Ohio

Board of Revision

Ohio's county-level first step for property tax appeals. March 31 filing deadline every year.

Ohio Board of Revision

Indiana

PTABOA

Indiana's county Property Tax Assessment Board of Appeals. Form 130 filed within 45 days of notice.

Indiana PTABOA

Commercial property tax appeal background

THINK YOU'RE OVER-ASSESSED?

Get a Free Assessment Review

Now you know why your taxes keep climbing. The next step is finding out if yours can be reduced. No fee unless we save you money.

Government building representing property tax assessment and increase appeals