Montgomery County Property Reappraisal 2026: What Homeowners Need to Know About Higher Values and Appeals

If you own a home in Montgomery County, you have likely received a tentative value notice from the County Auditor's office in recent weeks. The 2026 countywide reappraisal has raised residential property values by an average of 19 percent, or roughly $35,678 per home, according to county data. Nearly 92 percent of homeowners in the county saw their assessed values go up. Here is exactly what that means for your taxes, what deadlines you need to know, and how to appeal if your new value does not reflect what your home is actually worth.

What Is the 2026 Reappraisal and Why Did It Happen?

Ohio law requires each county to conduct a full reappraisal of all taxable parcels every six years. Montgomery County's last reappraisal took effect in 2020, making 2026 the year for the next mandated update. The county's appraisal team reviewed more than 250,000 parcels, analyzing recent home sales, property characteristics, and neighborhood market trends to assign each property a new tentative market value.

The result: total county property values rose from roughly $39 billion to about $46 billion. For homeowners, that means the value the county assigns to your home has likely gone up significantly. But a higher appraised value does not automatically mean your tax bill will rise by the same percentage, because the total millage rate may adjust as values change. Still, it is critical to review your notice carefully and understand your options.

How Does the New Value Affect My Property Taxes?

In Ohio, property taxes are calculated on 35 percent of your home's appraised market value, known as the assessed value. If the county now says your home is worth $300,000 instead of $250,000, your assessed value goes from $87,500 to $105,000. Your total tax is that assessed value multiplied by the combined millage rate from your school district, city or township, county, and any special levies.

The new tentative values will be used for taxing purposes starting with tax bills received in calendar year 2027 (tax year 2026, pay year 2027). That gives homeowners time to review, question, and if needed appeal their value before it goes into effect. It is not too late to act if you believe your tentative value is too high.

Key Dates and Deadlines Every Homeowner Should Know

Here are the most important dates to put on your calendar right now:

Should You Appeal Your New Property Value?

Not every increase is unreasonable. If the home next door sold for 20 percent more than what you paid two years ago, your value probably should have gone up. But if your tentative value does not match what a buyer would actually pay for your home today, an appeal is worth pursuing.

Strong grounds for an appeal include recent comparable sales in your neighborhood that support a lower value, errors in the county's property description (wrong square footage, incorrect number of bedrooms, outdated condition assessment), or significant physical issues with your home that affect market value. The informal review period is designed to catch these kinds of discrepancies quickly, without the formal paperwork and hearing process.

How to Get Started with an Informal Review

The informal review is free and straightforward. Visit the Montgomery County Auditor's reappraisal website or call their office to schedule a 15-minute appointment. During the meeting, an appraiser will walk through the data they used to determine your value. You can point out comparable sales or property condition issues, and the appraiser may adjust your tentative value on the spot if the evidence supports it.

If you are not satisfied after the informal review, the formal appeal period opens January 1, 2027. The Board of Revision process requires a completed DTE Form 1, supporting evidence (comparable sales, photos, appraisal reports), and a hearing. Many homeowners benefit from professional guidance at this stage. A local real estate agent can help you pull comparable sales data, and a real estate attorney or appraiser can build a stronger case.