Warren County, Ohio tax rates come down to three things for most households: a 6.75% sales tax on retail purchases, property taxes calculated on 35% of your home’s appraised value at a millage rate that varies by neighborhood, and, for residents of Kings Local School District only, a 1% school district income tax. State and federal income taxes apply on top, but the county itself does not levy a general income tax.
Sales and Use Tax
The combined sales and use tax rate in Warren County is 6.75%. That is the 5.75% Ohio base rate plus a 1.00% county levy.1Ohio Department of Taxation. County Sales Tax Rate Report Retailers collect it at the register on most tangible goods and certain services and remit it to the state.
Use tax applies at the same 6.75% rate when you buy from an out-of-state or online seller that doesn’t charge Ohio sales tax. Most large online marketplaces now collect it automatically, but purchases from smaller out-of-state vendors can still leave you owing use tax directly.2Ohio Department of Taxation. Sales and Use Tax
Property Tax Rates
There is no single property tax rate for Warren County. Your rate is a sum of levies from every taxing body that covers your parcel: the county, your school district, any vocational school district, your township or municipality, and special districts such as fire or library levies. Rates are quoted in mills. One mill equals one dollar of tax for every $1,000 of assessed value. A home with $70,000 in assessed value in a district with a 75-mill rate would owe roughly $5,250 before credits.
Because the overlapping jurisdictions each set their own rates, two homes a short drive apart can carry noticeably different bills. Your annual tax statement itemizes the millage going to each entity, so you can see where every dollar is directed.
The 35% Assessed Value Base
Ohio taxes property on 35% of appraised market value, not the full value.3Ohio Department of Taxation. Real Property Tax – General A home appraised at $300,000 has an assessed value of $105,000, and the millage rate applies to that figure. The 35% ratio is uniform across property types statewide.
How Your Appraised Value Is Set
The Warren County Auditor sets the appraised market value that drives your tax calculation. Ohio law requires a full reappraisal every six years, with a triennial update three years in between that adjusts values using sales data without a new physical inspection.4Ohio Department of Taxation. Property Value Reappraisal and Update Schedule Warren County’s next reappraisal is scheduled for 2027.5Warren County Auditor. Property Reappraisal
Between those cycles, the auditor picks up value changes from new construction and significant renovations. Finishing a basement, adding a room, or putting up a new structure all raise your appraised value once the improvement is identified.6Ohio Department of Taxation. Property Tax Resource Hub
School District Income Tax
Some Ohio school districts collect a separate income tax from residents, charged on top of state and federal income taxes. It is based on where you live, not where you work. In Warren County, only Kings Local School District imposes one, at a rate of 1.00%.7Ohio Department of Taxation. School District Income Tax Rates – Tax Year 2026 Residents of every other Warren County school district owe nothing on this line. Statewide, 210 districts levy such a tax as of 2026, so if you move within Ohio, check the Department of Taxation’s address lookup at tax.ohio.gov to confirm your district and rate.8Ohio Department of Taxation. School District Income Tax
Programs That Lower Your Property Tax
The headline millage rate is not necessarily what you pay. Several programs reduce the bill for qualifying owners, and many eligible homeowners never apply.
Homestead Exemption
Ohio’s homestead exemption shields a portion of your home’s market value from taxation. For tax year 2026, qualifying homeowners can exempt $26,200 of market value. You must be at least 65 or permanently and totally disabled, and your total Ohio Modified Adjusted Gross Income (including your spouse’s) must be $38,600 or less.9Ohio Department of Taxation. Homestead Income Threshold 2026
Veterans with a 100% service-connected disability receive a larger exemption of $58,000 in market value with no income limit, as do surviving spouses of public service officers killed in the line of duty.10Ohio Department of Taxation. Real Property Tax – Homestead Means Testing
Owner-Occupancy Credit
If you own and live in your home as your primary residence, the owner-occupancy reduction cuts taxes on qualifying levies by 2.5%. You must own and occupy the property as of January 1 of the filing year, and you can claim the credit on only one Ohio property. Applications go to the county auditor by December 31.11Ohio Department of Taxation. Application for Owner-Occupancy Tax Reduction Recent state legislation would expand the credit to 15.38% over the next four years and extend it to all levies regardless of passage date.12Ohio House of Representatives. Rep. Stephens Introduces Legislation to Update Ohios Owner Occupancy Property Tax Credit
Current Agricultural Use Valuation
Qualifying farmland can be taxed on its earning capacity rather than market value under Ohio’s CAUV program. At least ten acres must have been in commercial agricultural production for the three years before you apply. Parcels under ten acres can still qualify if average annual gross farming income reached at least $2,500 over that same period.13Ohio Department of Taxation. Current Agricultural Use Value (CAUV) File DTE Form 109 with the Warren County Auditor. New owners of CAUV land must file their own application even if the prior owner was already enrolled.
Leaving the program is expensive. If you convert the land to a non-agricultural use or stop farming it, you owe the difference between what you paid under CAUV and what you would have paid at full market value for the three tax years before the conversion.14Ohio Legislative Service Commission. Ohio Revised Code 5713.34 – Portion of Tax Savings on Converted Land On land that has been heavily discounted for years, that recoupment can be substantial.
When Property Tax Is Due
The Warren County Treasurer collects property taxes in two installments. For tax year 2025 (payable in 2026), the first half is due February 25, 2026, and the second half is due August 12, 2026.15Warren County Ohio. Warren County Real Estate Bills Dates shift slightly each year. Payment is accepted by mail, in person, or through the county’s online portal by electronic check or credit card.
Miss a deadline and a 10% penalty attaches to the unpaid half. Pay within ten days of the due date and the Treasurer waives half of that, bringing the penalty to 5%.16Ohio Legislative Service Commission. Ohio Revised Code 323.121 – Penalty and Interest for Failure to Pay Real Estate Taxes After the ten-day grace period, the full 10% applies with no negotiation.