How to Appeal Property Taxes in Franklin County, Ohio (2026 Guide)

The 2026 Franklin County value appeal window is November 20, 2026 through March 31, 2027; the 2025 appeal deadline was March 31, 2026 and has passed. File with the Franklin County Board of Revision, preferably through the online DTE 1 portal, or by email, fax, mail, or in person at 373 S. High St., 20th Floor, Columbus, OH 43215.

How assessments work in Franklin County

Franklin County is in a 2026 triennial property value update. That means the Auditor is not doing a full door-to-door sexennial reappraisal like 2023; instead, certified appraisers review values using recent arm’s-length sales and apply market updates. The county’s 2026 timeline is unusually important for homeowners: proposed values were scheduled for June 2026, review sessions for July–September 2026, and final values for December 2026.

Ohio taxes real estate in arrears. In plain English, the value labeled tax year 2026 generally affects tax bills paid in 2027. The Board of Revision appeal you file between November 20, 2026 and March 31, 2027 is the formal way to challenge that 2026 Auditor value after the informal review period is over.

Your tax bill is not based on 100% of market value. Ohio uses 35% of the Auditor’s appraised value as taxable value, then applies your taxing district’s rates and credits. Franklin County has many taxing districts, so a Columbus homeowner and a New Albany-area homeowner can have different savings from the same value reduction.

For a concrete example, the 2025 residential/agricultural effective rate for Taxing District 010, City of Columbus, was 49.775275 mills. If a Columbus owner-occupied home is reduced from $350,000 to $300,000, the market value drops $50,000. The rough annual tax impact is: $50,000 × 35% × 49.775275 / 1,000 = $871 before credits. After applying the listed non-business and owner-occupancy credit percentages for that district, the estimated annual savings is about $788. Your parcel may differ because rates, credits, TIF treatment, special assessments, and exemptions vary by address.

Whether you should appeal

Appeal if you can prove the Auditor’s market value is too high, not simply because the tax bill feels unaffordable. The Board says it hears complaints about the Auditor’s appraised value, not the amount of tax dollars you pay.

The strongest Franklin County evidence is usually one of these:

• A recent arm’s-length purchase of your property, especially close to January 1, 2026, with the settlement statement, purchase contract, deed, and conveyance fee statement.
• A recent independent appraisal that gives a lower market value and uses relevant Franklin County comparable sales.
• Comparable sales in your neighborhood showing similar homes sold for less than the Auditor’s value.
• A factual data error on the Auditor’s property record: wrong square footage, bedroom/bath count, finished basement, condition, or property class.
• Damage, casualty, or condition issues that existed for the tax year and are documented with photos, contractor estimates, permits, or insurance records.

Be careful if you already filed a value complaint for the same parcel in the same three-year interim period. Franklin County’s rules say only one complaint per parcel may be filed in a triennial period unless a listed exception applies, such as an arm’s-length sale, casualty loss, substantial improvement, or a 15% occupancy change with substantial economic impact.

I did not find an official Franklin County publication giving a current homeowner “win rate,” median reduction, or average savings. The Auditor’s 2025 annual report says the Board of Revision has reviewed over 24,000 property value reassessment filings since 2019 and that 16 mobile filing events were hosted in 2025, but it does not publish a success-rate table.

Also check tax relief programs, because they may save money without changing value. Owner-occupancy credit is for homeowners who own and occupy the home as their primary domicile as of January 1. Homestead exemption, disabled-veteran homestead, damaged-property reduction, CAUV, and exemption-related forms appear in the Auditor’s form center; these are separate from a DTE 1 value appeal.

Step-by-step how to file

1. Look up your parcel. Use the Franklin County Auditor property search and save the property record, tax district, current appraised value, taxable value, and recent sales history.

2. Pick the right form. Use DTE 1 — Complaint Against the Valuation of Real Property for a normal house, condo, or residential parcel. Use DTE 1M — Complaint Against the Valuation of a Manufactured or Mobile Home Taxed Like Real Property for manufactured/mobile homes. Use DTE 2 — Complaint Against the Assessment of Real Property Other than Market Value for non-value issues such as classification, CAUV issues, non-business credit eligibility, or certain exemption/assessment issues.

3. State your opinion of value. On DTE 1, Franklin County emphasizes that you must state your requested full market value on line 8. Do not list only the tax savings you want.

4. Attach evidence up front. The Board’s rules put the burden on you to prove the assessment error and prefer evidence with the original complaint. Attach your appraisal, settlement statement, purchase contract, comparable-sales sheet, photos, contractor estimates, or property-record corrections.

5. File by the deadline. For 2026 values, the county Treasurer’s FAQ says applications will be accepted November 20, 2026 until March 31, 2027. Ohio’s rule is March 31 of the following tax year or the last day to pay first-half taxes without penalty, whichever is later; Franklin County has identified March 31 as the operative deadline for this cycle.

6. Choose a filing method. Franklin County allows: e-file through the BOR portal; email to BOR@franklincountyohio.gov; fax to 614-525-6252; mail to Franklin County Board of Revision, 373 S. High St., 20th Floor, Columbus, OH 43215; or in-person delivery to the same 20th-floor address. A USPS postmark proves timely mail filing; for email, the date received by the Board controls. The official instructions do not list a county filing fee or payment step for BOR complaints.

What happens after

The appeal authority is the Franklin County Board of Revision. It sits as a three-member panel made up of the Auditor, Treasurer, and a member of the Board of County Commissioners, or their designees.

Filing a BOR complaint entitles you to a hearing, but not every case necessarily needs a full contested hearing. Franklin County says cases may move faster if they are eligible for a “no hear” path, such as a recent sale with supporting documents or a recent appraisal, or if the case is routed to mediation. Mediation is separate from the hearing process, but any agreement still must be approved by the Board of Revision.

For hearings, expect a quasi-judicial process. The Board gives notice of the time and place. Hearings are generally conducted by live remote streaming; if you want an in-person hearing, the rules say to contact the Board at least ten days before the scheduled hearing. Witnesses testify under oath. The property owner or complainant presents first, any counter-complainant goes next, and the Auditor’s office may present a qualified witness last. Cross-examination is allowed at the Board’s discretion and as time permits.

Decision timing varies. Franklin County says timing depends on complaint volume, pending prior-year cases, statutory notice periods, and whether the Board of Education opposes the requested change. After a decision, Ohio law provides a 30-day appeal period. Refund processing generally starts after that period; Franklin County says refunds are typically processed within about three additional weeks, though ownership changes, multiple payments, or extra documentation can slow things down. Appeals from the BOR decision generally go to the Ohio Board of Tax Appeals or Franklin County Court of Common Pleas within 30 days.

Local tips

• Use the 2026 informal review sessions before the BOR window if you can. Once final values are issued, the DTE 1 appeal is more formal and evidence-driven.
• Match comps to your actual neighborhood and property type. Franklin County’s triennial update is sales-driven, so weak comps from a different school district or municipality are less persuasive.
• Include an email address. Franklin County says email helps it send notices by email and ordinary mail; without email, notices may go by certified mail.
• Keep paying attention to tax bills while the case is pending. You may request tender pay based on your claimed value, but if the final value is higher than your tender amount, interest and possibly penalties can apply.
• If your home is your primary residence, confirm the owner-occupancy credit is on your parcel. If you are 65+, permanently disabled, a disabled veteran, or a qualifying surviving spouse, check the homestead-related forms too.
• If a school district or prior owner filed a complaint affecting your parcel, do not ignore the notice. Franklin County says current owners may be notified even if they did not file the case.