Ohio’s property tax school funding system pays for roughly half of K-12 education costs across the state’s more than 600 districts, with the state covering about 37 percent and federal dollars filling the rest. What you actually owe depends on your county auditor’s appraisal of your home, the millage your district levies, and a 1976 law that stops voted levies from growing when property values rise. Those three pieces explain nearly every quirk on your tax bill, including why school levies keep appearing on the ballot.
How Your School Tax Bill Is Calculated
Ohio does not tax property at full market value. The county auditor sets an appraised (market) value for your home, and the taxable amount is 35 percent of that figure.1Ohio Department of Taxation. Real Property Tax – General A home appraised at $200,000 carries an assessed value of $70,000, and that $70,000 is what the school district’s rate applies to.
Rates are expressed in mills. One mill equals one dollar of tax per $1,000 of assessed value, so on a $70,000 assessed value each mill generates $70 a year. A district levying 80 mills would produce a $5,600 annual school tax on that home before any credits.
County auditors must reappraise every parcel every six years and run a market-value update in the third year of that cycle.2Ohio Department of Taxation. Property Value Reappraisal and Update Schedule In fast-moving markets, the gap between the auditor’s value and what your home would sell for can be significant, and that gap is one of the most common reasons homeowners file a challenge.
Inside Millage and the Ten-Mill Limit
Not every school tax needs voter approval. The Ohio Constitution and state law allow taxing authorities to levy up to 10 mills per dollar of assessed value without a ballot. That unvoted baseline is called inside millage.3Ohio Legislative Service Commission. Ohio Code 5705.02 – Aggregate Levy Limitations School districts average about 4.7 mills of inside millage, and the 10-mill cap is shared among all overlapping taxing bodies in your area, including the county, township, and any special districts.4Ohio Legislative Service Commission. Inside Millage
Inside millage grows with property values. When assessed values climb 15 percent, inside millage collections climb 15 percent too. The district has to formally declare each year that it wants the additional revenue; if it does not, it forgoes some or all of the increase.4Ohio Legislative Service Commission. Inside Millage
Everything above the 10-mill limit requires voter approval. That larger category, called outside millage, is where most school revenue lives and where the state’s most important tax law takes effect.
House Bill 920: Why Voted Levies Don’t Grow With Home Prices
In 1976 the Ohio General Assembly enacted House Bill 920, now codified at Ohio Revised Code Section 319.301, to keep tax bills from automatically rising when the auditor updated property values.5Ohio Legislative Service Commission. Property Tax Reduction Factor The mechanism is a “tax reduction factor” that pushes voted millage rates downward after each reappraisal so the district collects roughly the same total dollars from existing property that it collected the year before.6Ohio Legislative Service Commission. Ohio Code 319.301 – Determining and Certifying Tax Reduction Percentage for Carryover Property
Say voters approved a levy expected to generate $5 million a year. Five years later a reappraisal lifts property values 20 percent across the district. Without HB 920 the levy would suddenly produce $6 million. The reduction factor prevents that windfall by lowering the effective millage rate so the levy still collects $5 million from the same parcels. Your tax on that voted levy does not jump just because your home was reappraised higher.
The reduction applies only to “carryover property,” meaning parcels that were on the rolls in both the current and prior year. New construction is excluded, so a district picking up a new subdivision or commercial building does collect additional revenue from it.5Ohio Legislative Service Commission. Property Tax Reduction Factor In a district with little new development, that exception yields almost nothing.
The consequence is a squeeze on school budgets. Salaries, utilities, fuel, and health insurance all rise with inflation, but HB 920 locks the district’s largest local revenue source at the dollar amount voters originally approved. Over a decade a levy can lose a quarter or more of its purchasing power. That is why Ohio districts return to the ballot as often as they do.
The 20-Mill Floor
Ohio law carves out one exception. Under Ohio Revised Code Section 319.301(E), the reduction factor cannot push a district’s effective current-expense rate below 20 mills, a threshold known as the 20-mill floor.7Ohio Legislative Service Commission. Property Tax Millage Floors for School Districts Once a district hits that floor, reduction factors stop applying to its current-expense levies.
At the floor, voted school revenue starts behaving like inside millage: when property values rise, collections rise. It is the only scenario in which voter-approved school levies grow naturally with the real estate market. Districts in higher-wealth areas that have gone many years without a new operating levy are the ones most likely to sit at the floor. Joint vocational school districts have a separate, much lower floor of 2 mills.7Ohio Legislative Service Commission. Property Tax Millage Floors for School Districts
What the Levy Types on Your Ballot Actually Do
The label on a school levy determines how the money can be spent and how the rate is calculated.
- Operating levies cover day-to-day costs like teacher salaries, utilities, and classroom materials. They can run for a fixed number of years or continue indefinitely until voters repeal them. Most levy campaigns are operating levies.
- Permanent improvement levies are restricted to capital assets with an expected life of five years or more, such as buses, roof replacements, or technology equipment. The money cannot go to salaries or routine operations.
- Bond issues are long-term borrowing for major construction like a new building or athletic facility. The district issues bonds and property owners repay them through a dedicated millage over 20 to 30 years. Interest is generally exempt from federal income tax for investors, which lowers the district’s borrowing rate.
- Emergency levies generate a fixed dollar amount rather than a fixed millage rate. The rate adjusts each year to hit the target: it rises if property values drop and falls if values climb.
Ohio also allows districts to levy a school district income tax on residents, separate from state and municipal income taxes. Because it taxes income rather than property, HB 920 never touches it, and revenue moves with residents’ earnings. Some districts apply it to all taxable income; others limit it to earned income only, which excludes retirement and investment income.
The Homestead Exemption
Ohio’s homestead exemption reduces the taxable value of a qualifying homeowner’s property, which directly lowers the school taxes owed. For tax year 2026 the amounts are:
- Age 65 or older, or permanently disabled: $29,000 reduction in assessed value, if total household income does not exceed $40,000.
- Disabled veterans and surviving spouses of public service officers killed in the line of duty: $58,000 reduction in assessed value, with no income limit.8Ohio Department of Taxation. Real Property Tax – Homestead Means Testing
You have to own and occupy the property as your principal residence as of January 1 of the application year. Surviving spouses of homestead recipients may also qualify if they were at least 59 at the time of the recipient’s death. Homeowners who were already receiving the exemption in 2013, before income-based means testing took effect, are grandfathered in with no income cap.
One point worth knowing: the state reimburses school districts for revenue lost to homestead exemptions, so districts do not lose money when residents claim the reduction. The cost sits in the state budget, not the local school operating fund.8Ohio Department of Taxation. Real Property Tax – Homestead Means Testing
Challenging the Auditor’s Valuation
Your school tax bill starts with the county auditor’s appraisal, so an inflated value means you overpay every taxing body on the bill, including the school district. Ohio law lets you challenge the number by filing a Complaint Against Valuation with the county Board of Revision.
The filing deadline is March 31 of the year following the tax year in question, or the closing date of first-half tax collection, whichever is later.9Ohio Legislative Service Commission. Ohio Code 5715.19 – Complaint Against Valuation or Assessment Miss the window and you wait until next year. You can generally file only once per three-year cycle between reappraisals.
The burden of proof is on you. The auditor’s value is presumed correct, and you need reliable evidence that it is wrong. Recent arm’s-length sales of comparable properties are the strongest evidence. Declining market conditions, reduced rental income, or physical damage can also support a reduction. A recent purchase price below the auditor’s value is one of the cleanest cases.
Expect the school district to receive a copy of your complaint. If the reduction you seek exceeds $50,000 in market value, the district’s attorneys may intervene, cross-examine you at the hearing, and put on their own evidence that the current value is correct. If the Board of Revision rules against you, you can appeal to the Ohio Board of Tax Appeals or the county Court of Common Pleas.