Knox County Property Tax Appeal — Ohio

Rob Hartley·Updated April 3, 2026

Knox County is located in central Ohio with Mount Vernon serving as the county seat. As of the 2020 census, the population was 62,721. The county is part of the Mount Vernon Micropolitan Statistical Area and includes notable communities such as Mount Vernon, Centerburg, Fredericktown, Danville, and Gambier (home to Kenyon College). Property tax appeals are particularly important in Knox County because the median effective tax rate of 1.84% is significantly higher than the national median of 1.02%, creating a substantial burden on homeowners and making assessment accuracy critical for fair taxation.

Notable cities: Mount Vernon, Centerburg, Fredericktown, Danville, Gambier

Median Home

$133,520

Tax Rate

1.84%

Annual Tax

$2,431

Population

62,721

2026 Appeal Deadline: March 31, 2026 for tax year 2025

Appeals must be filed with the Knox County Board of Revision between January 1st and March 31st annually. For 2026, the deadline is March 31, 2026 to appeal your 2025 assessment. The filing period is the same every year regardless of when you receive your assessment notice.

Property in Knox County, Ohio — local tax assessment and appeal guide

How Knox County Assesses Property

35%of market value

Assessed by: Knox County Auditor's Office

Assessment cycle: sexennial reappraisal with triennial update

Notices typically mailed: Spring (typically by mid-April)

In Knox County, property taxes are calculated based on the assessed value, which is 35% of the property's market value as determined by the County Auditor. For example, if your home's market value is $133,520 (the county median), at Ohio's 35% assessment ratio your assessed value would be $46,732, resulting in approximately $2,431 in annual taxes at the county's effective rate of 1.84%. The Auditor conducts a full reappraisal every six years with a triennial update at the three-year midpoint to adjust for market trends.

The Appeal Process

Appeals are heard by the Board of Revision. After filing your appeal, the Board of Revision (consisting of the County Auditor, County Treasurer, and President of the Board of Commissioners) will review your petition. You may receive a decision based on the submitted evidence, or be scheduled for a formal hearing where you can present your case in person with supporting documentation.

Step 1: Review your property valuation notice received in spring (typically mid-April) and compare your assessed value to similar properties in your neighborhood.

Step 2: Gather evidence to support your appeal, including recent appraisals, comparable sales data from similar properties, photographs of property condition, repair estimates, or market analyses from real estate professionals.

Step 3: Obtain and complete DTE Form 1 (Complaint Against The Valuation of Real Property) from the Knox County Auditor's website or office, or call(740) 393-6749 for assistance.

Step 4: File your completed appeal form with the Knox County Board of Revision between January 1st and March 31st. You can file in person at 117 East High Street, Suite 120, Mount Vernon, OH 43050, or by mail (postmarked by March 31).

Step 5: The Board of Revision will review your petition and either notify you of their decision or schedule you for a formal hearing. At the hearing, present your evidence showing why your property is over-assessed.

Step 6: If you disagree with the Board of Revision's decision, you may appeal to the Ohio Board of Tax Appeals using DTE Form 4 within 30 days of receiving the decision letter.

Step 7: As a final option, you can appeal the Board of Tax Appeals decision to the Knox County Court of Common Pleas or continue through the state appellate court system.

Required form: DTE Form 1 (Complaint Against The Valuation of Real Property)

Filing Methods

mail:Knox County Auditor, 117 East High Street, Suite 120, Mount Vernon, OH 43050 (must be postmarked by March 31)

in-person:Knox County Auditor's Office, 117 East High Street, Suite 120, Mount Vernon, OH 43050, Monday-Friday 8:00 AM - 4:00 PM

phone:Call(740) 393-6749 to request forms and assistance with filing

Evidence to Bring

Recent property appraisal (as of January 1 lien date)Comparable sales data from similar propertiesPhotographs showing property condition or defectsRepair or maintenance cost estimatesMarket analysis from real estate professionalTotal construction cost documentation for newer homes

Knox County Assessor Contact

Knox County Auditor's Office

Phone: (740) 393-6750 (main) or(740) 393-6749 (Board of Revision assistance)

Address: 117 East High Street, Suite 120, Mount Vernon, OH 43050

Website: https://www.knoxcountyauditor.org/

Hours: Monday - Friday, 8:00 AM - 4:00 PM

Tax Exemptions in Knox County

Homestead Exemption for Seniors, Disabled, and Surviving Spouses

$29,000 exemption from home's market value

Provides property tax relief by exempting a portion of the home's value from taxation for eligible senior citizens (65+), disabled persons, and surviving spouses.

Eligibility: Must be 65+ years old, permanently and totally disabled, or surviving spouse of qualifying individual. Must own and occupy home as primary residence as of January 1. For tax year 2026, Ohio Adjusted Gross Income must be $41,000 or less (no income limit if received exemption in 2013 tax year).Deadline: December 31 of the application year (file using DTE Form 105A)

Owner Occupancy Tax Reduction

2.5% reduction on tax bill

Provides a 2.5% reduction on property tax bills for homeowners who live in their property as their primary residence.

Eligibility: Every property owner who resides in their own property as principal place of residence (domicile) on January 1 of the filing year. Homeowner and spouse entitled to only one reduction in Ohio.Deadline: Must apply; often handled at time of real estate transfer. Reduction reflects on next year's tax bill after filing.

Disabled Veterans and Surviving Spouses Exemption

Varies based on disability rating; no income limit required

Property tax exemption for qualifying disabled veterans and surviving spouses of public service officers killed in the line of duty.

Eligibility: Disabled veterans with service-connected disability or surviving spouses of qualifying public service officers killed in line of duty.Deadline: December 31 of application year (file using DTE Form 105I)

Current Agricultural Use Valuation (CAUV)

Reduction to current agricultural use value rather than market value

Provides tax relief through property value reductions on farmland devoted exclusively to agricultural use.

Eligibility: Land of 10+ acres devoted exclusively to agricultural use or timberlands, OR less than 10 acres with average yearly gross farm income of at least $2,500 from agricultural products for past 3 years.Deadline: Contact Knox County Auditor at(740) 393-6748 for application deadlines and requirements

Official Resources

Knox County Auditor Official Website →

Official county website with property search, tax information, forms, and assessment details.

Knox County Board of Revision Information and Forms →

Complete information about filing appeals with the Board of Revision including DTE Form 1 and filing instructions.

Ohio Department of Taxation - Property Tax Forms →

State department providing all official DTE forms for property tax appeals, exemptions, and complaints.

Knox County Homestead Exemption Information →

Detailed information about homestead exemption eligibility, income limits, application forms, and deadlines.

Check Your Knox County Assessment

Enter your address to see if your Knox County property is overassessed.

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Frequently Asked Questions

What is the deadline to appeal my property taxes in Knox County for 2026?

The deadline to file a property tax appeal in Knox County is March 31, 2026 for tax year 2025 assessments. You can file your appeal with the Knox County Board of Revision beginning January 1, 2026. This is a firm deadline set by Ohio Revised Code 5715.19 with no extensions or exceptions. If you mail your appeal, it must be postmarked by the U.S. Postal Service on or before March 31, 2026. Private meter postmarks from companies like FedEx or UPS are not accepted as proof of timely filing.

How do I file a property tax appeal in Knox County?

To file a property tax appeal in Knox County, you must complete DTE Form 1 (Complaint Against The Valuation of Real Property) and submit it to the Knox County Board of Revision between January 1st and March 31st. You can obtain the form from the Knox County Auditor's website at https://www.knoxcountyauditor.org or by calling(740) 393-6749. You can file in person at 117 East High Street, Suite 120, Mount Vernon, OH 43050, or by mail (must be postmarked by March 31). Include supporting evidence such as recent appraisals, comparable sales data, photographs of property condition, or repair estimates to strengthen your appeal.

What is the homestead exemption worth in Knox County?

The homestead exemption in Knox County exempts the first $29,000 of your home's market value from property taxation for eligible seniors (65+), disabled persons, and surviving spouses. For example, if your home is valued at $133,520, the exemption reduces your taxable value to $104,520 before applying the 35% assessment ratio. To qualify for tax year 2026, your Ohio Adjusted Gross Income must be $41,000 or less, though no income limit applies if you received the exemption in 2013. You must apply by December 31 using DTE Form 105A available from the Knox County Auditor's office.

What happens at a Board of Revision hearing in Knox County?

At a Knox County Board of Revision hearing, you will present your case before a three-member panel consisting of the County Auditor, County Treasurer, and President of the Board of Commissioners (or their designated representatives). You will have the opportunity to present evidence supporting your opinion of your property's value, including appraisals, comparable sales, photographs, and expert testimony. The burden of proof is on you as the complainant to demonstrate that your property is over-assessed. The Board may also hear counter-complaints from the local school board. After reviewing all evidence, the Board will issue a written decision either maintaining, reducing, or potentially increasing your property's assessed value.

How much can I save by appealing my property taxes in Knox County?

Potential savings from a property tax appeal in Knox County depend on how much you can reduce your assessed value. With the county's effective tax rate of 1.84%, every $10,000 reduction in market value translates to approximately $64 in annual tax savings (calculated at the 35% assessment ratio). For example, if you successfully reduce your home's valuation from $150,000 to $130,000 (a $20,000 reduction), you would save approximately $128 per year. Studies show that about 25% of homes in America are unfairly over-assessed by an average of $1,346 annually, making appeals worthwhile for many homeowners. However, actual savings vary based on individual circumstances and the strength of your evidence.

What evidence do I need for a Knox County property tax appeal?

For a successful Knox County property tax appeal, you should provide a recent property appraisal prepared by a qualified appraiser as of the January 1 lien date, comparable sales data from similar properties in your neighborhood that sold recently, photographs documenting property condition or defects, cost estimates for needed repairs or maintenance, or a market analysis prepared by a real estate professional. For newer homes, include total construction costs including land acquisition. The Board of Revision will not consider percentage increases in taxes or simple comparisons to nearby properties' valuations. All evidence should be submitted with your DTE Form 1 or at least 5-10 days before your scheduled hearing to allow adequate review time.

When does Knox County conduct property reappraisals?

Knox County conducts a full sexennial (six-year) reappraisal and a triennial (three-year) update on a rotating schedule mandated by Ohio law. The county completed a full reappraisal in 2020 and a triennial update in 2023. The next major valuation event will occur in 2026. During a full reappraisal, every property in the county is individually assessed. During a triennial update at the midpoint, the Auditor analyzes recent sales trends and applies percentage adjustments by district without physically inspecting each property. Assessment notices are typically mailed in the spring (by mid-April), and you can appeal the new values between January 1st and March 31st of the following year.

Can I appeal my Knox County property taxes if I missed the March 31 deadline?

Unfortunately, Ohio law provides no extensions or exceptions to the March 31 deadline for filing property tax appeals with the Knox County Board of Revision. This deadline is strictly enforced under Ohio Revised Code 5715.19. If you miss the deadline, you will have to wait until the next filing period (January 1 - March 31 of the following year) to appeal. However, Ohio Revised Code allows only one filing within each three-year period, so if you file and then withdraw your complaint, it still counts as your one filing for that triennial cycle. To avoid missing the deadline, set reminders when you receive your assessment notice in spring, and contact the Knox County Auditor's office at(740) 393-6749 for assistance with filing.

For state-wide appeal information including Ohio's assessment ratio and deadlines, see our Ohio Property Tax Appeal Guide →

Considering professional help with your appeal? Compare pricing, coverage, and pros/cons in our Best Property Tax Appeal Services (2026) or browse side-by-side service comparisons →

More Ohio Counties

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← All Ohio property tax appeal info

Sources: https://www.knoxcountyauditor.org/ | https://www.knoxcountyauditor.org/site-links/board-of-revision/ | https://www.ownwell.com/trends/ohio/knox-county | https://en.wikipedia.org/wiki/Knox_County,_Ohio | https://www.knoxcountyauditor.org/site-links/homestead-exemption/

Last verified: 2026-04-03