Union County Auditor Property Search: Records, Taxes & Maps

by
Union County, Ohio · Owner, parcel, tax, deed, survey and GIS help

Find Parcels, Taxes, Maps & Deeds

Search a Union County property by owner name, address or parcel ID, then use the detailed record to review ownership, market value, assessed value, land and building facts, transfers, tax history, credits and the parcel’s effective tax district.

This guide explains exactly what to type, why a result may be missing, what every important field means, and when to move from Beacon to the Treasurer, Recorder, GIS, Engineer or Board of Revision.

Start with the quick answer See exact search steps Fix a failed search
Confirm the parcel before using the information. Match the property address and parcel ID—not only an owner name. Ownership, tax and map information can change after a sale, correction, parcel split, combination or TIF update, and GIS lines are not legal boundary surveys.

Quick answer: where should you search first?

Use the official Union County Beacon Property Search for owner, address, parcel, value, building, sale and tax-history information. Search with fewer details first, select the correct Parcel ID, open the detailed property report, and scroll to Tax History for tax year 2025 payable in 2026.

1 Search broadly Last name, house number or parcel ID.
2 Select Parcel ID Open the detailed property record.
3 Verify two identifiers Address plus parcel or property facts.
4 Use the next office Treasurer, Recorder, GIS or BOR.
Auditor phone

937-645-3003

auditor@unioncountyohio.gov

Auditor office
233 West 6th Street
2nd Floor
Marysville, OH 43040
Published hours

Monday–Friday

8:30 a.m.–4:00 p.m.

Closed 8:30–10:00 a.m. on the third Tuesday monthly.

Beacon also includes advanced sales search, monthly transfers, property reports, exports, parcel maps, tax estimators, proposed-levy estimates and EagleView imagery after a parcel is selected.

Open official Beacon property search Read official Beacon instructions
Official Union County Ohio Auditor property search with owner, address and parcel ID lookup fields
Search the official Union County property database by owner name, property address or parcel ID.

Choose the property problem you need to solve

Each section answers a separate task, so you can go directly to the help you need.

Avoid the wrong county portal

Which Union County office handles your task?

Use the Auditor to identify and understand the parcel, the Treasurer for payment questions, the Recorder for legal documents and the Engineer or GIS system for map and survey research.

Correct office or tool for common property tasks
What you need
Correct office or tool
What it provides
Important limit
Owner, parcel, value or property facts
Auditor / Beacon
Owner display, appraisal, land, buildings, sales, taxes, maps and property reports.
The owner display is not a legal title opinion.
Tax bill, payment, penalty or escrow
Treasurer
Payment collection, due dates, online payment, delinquency and monthly-payment help.
The Treasurer does not determine market value.
Deed, mortgage, lien or easement
Recorder
Recorded instruments, indexes, available images and certified copies.
The public search is not a complete title examination.
Parcel map or aerial image
Auditor GIS
Parcel location, aerial photography, sale information and map layers.
The displayed boundary is not a legal survey.
Survey, legal description or plat
Engineer / Recorder
Survey records, tax maps, subdivision plats and legal-description review.
Not every subdivision plat is available online.
Challenge market value
Board of Revision
DTE 1 complaint, evidence review and hearing process.
The Board does not change tax rates.
Homestead, occupancy or CAUV
Auditor
Applications, program rules, renewals and transfer forms.
Each program has separate eligibility requirements.
Efficient workflow: Find the parcel in Beacon, copy the parcel ID, save the property report, and use the same parcel ID when calling the Treasurer, Recorder, Engineer or Board of Revision.

The official Property Search Tools page is useful when you need to move between Beacon, GIS, subdivision plats, historical maps and the GIS data portal.

Open Property Search Tools Compare property resources
Property-card decoder

Understand the parcel report before taking action

A useful property review goes beyond the owner and total value. Check the parcel identity, tax district, building facts, sale type and credits before paying, appealing or comparing property.

Important Union County parcel fields explained
Field
What it means
Practical next step
Parcel number
The county identifier for the property.
Use it for tax, GIS, deed, form and office questions.
Owner
The ownership name currently displayed by the Auditor.
Use the recorded deed when legal ownership proof is required.
Tax district
The combination of jurisdictions and levies applying to the parcel.
Use it to identify the correct effective tax rate.
Legal description
An abbreviated property-description reference.
Use the complete recorded deed or survey for legal work.
Market value
The Auditor’s estimate of open-market property value.
Review facts and recent valid sales before disputing it.
Assessed value
Generally 35% of market value under Ohio’s property-tax system.
Do not treat it as the final bill; rates, credits and assessments still apply.
Ownership history
Prior owners, conveyance type, purchase date and price.
Check whether a transfer was a valid arm’s-length sale.
Land information
Lot, soil, acreage and land-value rates.
Check acreage, use and CAUV status when relevant.
Dwelling and improvements
Floor area, dwelling features, sketch, grade, age, condition and depreciation.
Document errors before asking for a correction or filing BOR.
Tax History
Tax liability arranged by tax year and payable year.
Review tax year 2025 for the 2026 collection.

Find the parcel’s actual effective tax rate

Open the selected property Search and select the correct parcel.
Select “Where your taxes go” Beacon displays the levies applying to that specific property.
Find Total Effective Rate Use the effective rate for the parcel rather than a random countywide rate.
Check qualified credits Owner occupancy, Homestead and other reductions can affect the final calculation.
Review special assessments separately A value reduction or exemption may not remove city, township or county assessments.
TIF parcel warning: Beacon says some Tax Increment Financing property details can be split between two parcel records. Review both connected records when the report appears incomplete.
Read the official property-card guide Review county tax-rate resources
Troubleshooting order

No Union County property result found?

Follow this sequence before assuming the parcel is missing or using a paid third-party database.

Owner search returned nothing Search the last name and first initial. Try a former owner, trust, estate, LLC or alternate spelling.
Address search failed Search the house number first. Remove direction, suffix, punctuation and unit number.
Parcel ID failed Remove spaces or separators and check for a zero-versus-letter-O error.
The property recently sold Search the seller and check the Recorder for the new deed.
The parcel was split or combined Search nearby properties, the parent owner or the GIS map and contact the Auditor.
The mailing city looks wrong Verify the parcel by location, township, tax district and parcel number.
The property is new construction Search the landowner, developer, parent parcel or nearby road.
The parcel is connected with a TIF Check whether the property information is divided between two records.

Prepare this before contacting the Auditor

Complete or approximate address
Current or former owner
Parcel ID, if known
Approximate transfer date
Nearby road or intersection
Township, city or village
Property type or use
Screenshot of the failed search
Auditor call script “I am trying to identify the property at [address]. The current or previous owner may be [name], and I have [parcel number, deed reference or nearby intersection]. Can you confirm whether the parcel was transferred, split, combined, renumbered or connected with a TIF record?”
Call Auditor: 937-645-3003 Email the Auditor
Current 2026 payment help

Check Union County taxes, penalties and payment fees

Union County’s official payment page currently lists July 15, 2026 as the second-half deadline. Because that date has passed, verify the live balance and penalty before submitting payment.

First-half due February 18, 2026

Past deadline.

Second-half due July 15, 2026

Past deadline.

5% penalty July 16, 2026

Current late-payment stage.

10% penalty July 25, 2026

Next published penalty date.

Prior-year interest August 1, 2026

4.67% published rate.

December interest: The county lists December 1, 2026 for an additional 2.33% interest charge on the total unpaid balance. Contact the Treasurer for the exact current payoff.

Online and phone payment fees

Published Union County convenience fees
Method
Published fee
Practical note
Credit or debit card
2.5%; minimum $2.50
Check the dollar fee before authorizing a large tax payment.
Electronic check
$1.50
Usually less expensive than a card for large bills.
Automated phone
Processor fee applies
Call 877-814-8230 and save the confirmation number.
Mail
No processor fee
USPS cancellation date controls timeliness; a private meter date is not sufficient.
Drop box
No processor fee
The county lists a payment drop box at the back of the office building. Do not use cash.

Micro steps for online payment

Find the parcel in Beacon Confirm the parcel ID, property address and tax year.
Check whether a lender already paid Review mortgage escrow before making a duplicate payment.
Open the Treasurer-authorized payment page Use the county’s Pay Taxes Online link rather than an advertisement or unrelated processor.
Verify the property and balance Match the parcel ID and address before entering payment information.
Review penalty and convenience fee Do not assume the amount from an older bill is still current.
Save confirmation evidence Keep the payment date, amount, parcel ID, method and confirmation number.
Check payment posting An authorization screen does not always mean the public balance has already updated.

Missing bill, monthly payments or delinquency

Tax bill never arrived Search the parcel online and contact the Treasurer immediately. Failure to receive a bill does not remove penalty or interest.
Need monthly budgeting Ask about the Real Estate Tax Escrow Program for monthly prepayments of current taxes.
Taxes are delinquent Written installment plans may be available while current taxes remain paid.
Already paid the full year Ask whether the HB 186 second-half adjustment created a credit or refund.
Treasurer call script “I am calling about parcel [parcel ID] at [address]. I need to confirm the current balance, penalty, payment posting, HB 186 adjustment and whether an escrow or delinquent-payment plan is available.”
Open official online payment Verify dates and penalties Read Treasurer FAQs Call Treasurer: 937-645-3035
GIS, surveys and subdivision plats

Use Union County maps without mistaking them for legal surveys

Union County provides a GIS map, parcel-search panel, aerial imagery, measurement tools, sale information, historical tax maps, survey records and subdivision-plat resources.

Find a parcel in the GIS map

Copy the parcel ID from Beacon The parcel number is more reliable than a complex rural or newly assigned address.
Open the parcel-search panel The county describes the search box as the most important GIS search tool.
Enter less information first Try a house number, last name or part of a title before entering a complete record.
Select the correct result The map may zoom to the first match; select another listed parcel when necessary.
Choose Appraisal Information Use the parcel result to open more detailed appraisal and history information.
Use layers carefully Compare aerial years, sale information, parcel boundaries and other available layers.

Useful GIS tools and their limits

Union County GIS tools explained
Tool
Useful for
Do not rely on it alone for
Parcel Search
Finding and zooming to an owner, address or parcel result.
Legal ownership proof.
Aerial Photo
Comparing visible land and building changes over time.
Current condition or boundary measurement.
Measure
Approximate distance or area research.
Fence, setback or construction placement.
Sale Info layer
Viewing qualifying post-1995 sale dates and amounts over parcels.
Exempt or non-arm’s-length transfers that the layer does not display.
Identify
Selecting a visible parcel or active map layer for details.
A complete property report without opening Appraisal Information.
Transparency
Comparing two map or aerial layers visually.
A legal determination about improvements or encroachments.
Boundary warning: Do not place a fence, driveway, building, septic component or utility from an online parcel line. Review recorded deeds, plats and surveys and obtain licensed surveying help when exact ground boundaries matter.

Find surveys and subdivision plats

The Engineer creates tax maps, reviews legal descriptions, regulates subdivisions in unincorporated areas and maintains survey records. Original subdivision plats are filed with the Recorder, and not every plat is available online.

Engineer phone

937-645-3021

engineer@unioncountyohio.gov

Engineer hours

Monday–Friday

7:30 a.m.–4:30 p.m.

GIS questions

maps@unioncountyohio.gov

Open GIS and map tools Open Property & Survey records
Comparable-property research

Use sales and comparable searches effectively

Beacon provides advanced Sales Search, monthly sales and transfer lists, Comp Search and export tools. A good comparison requires more than a nearby address or similar price.

Match location
  • Same or similar tax district
  • Nearby township, city or village
  • Similar school-district influence
  • Comparable road and neighborhood setting
Match the property
  • Property class and use
  • Living area and building style
  • Year built, grade and condition
  • Lot size and improvements
Match the sale
  • Recent date
  • Market exposure
  • No unusual financing
  • No foreclosure, gift or trust distortion

Exclude misleading transfers

Family or related-party transfer
Gift or trust transfer
Sheriff or foreclosure deed
Partial-interest transfer
Multi-parcel transaction
Major condition difference
Different property use
Sale older than useful market evidence
Export tip: Save the parcel IDs, sale dates, property characteristics and search criteria. A list of prices without an explanation of comparability is weak appeal evidence.
Read Sales and Comp Search help Open Beacon
Recorded-document workflow

Find deeds, mortgages, liens and easements

Use the Recorder when you need the actual recorded instrument. The parcel report helps identify the owner, transfer date and deed reference, but it does not replace the recorded document.

Search official records step by step

Copy clues from Beacon Save the parcel ID, current owner, former owner, transfer date and deed reference.
Open the Recorder’s official search Read the database disclaimer before entering the document system.
Search both grantor and grantee Grantor generally transfers the interest; grantee generally receives it.
Narrow by document type Select deed, mortgage, release, lien, easement, affidavit or another relevant instrument.
Use the recording date A date range can separate a recent deed from older same-name documents.
Open the index and image Compare names, date, instrument number and legal-description clues.
Request a certified copy when required Ask the lender, court, agency or professional whether an ordinary printout is sufficient.

Online and historical record coverage

Union County Recorder record coverage
Record group
Published coverage
Search approach
Modern images and indexes
1995 to current
Use the main Official Records Search.
Deed grantor and grantee indexes
1875–1994
Use the historical deed-index books.
Mortgage grantor indexes
1944–1994
Use the historical mortgage index links.
Miscellaneous indexes
1960–1994
Use the separate direct and reverse indexes.
Original plats and older records
Varies by record series
Contact the Recorder when an online image is unavailable.

Recorder fees commonly needed by property owners

Published Union County Recorder charges
Item
Published fee
Practical note
Most real-estate documents
$39 for the first two pages
Includes deeds, mortgages, easements and many related instruments.
Additional page
$8 per page
Calculate every printed page before submitting.
Marginal reference
$4 each
May apply to releases, assignments, amendments and modifications.
Ordinary copy
$2 per page
Ask whether a certified copy is actually needed.
Certification
$1 additional per document
Certification is in addition to copy charges.
Free fraud-alert option: The Recorder offers a free notification service for possible real-estate fraud. Register all relevant owner-name variations, including a spouse, trust or business name.
Title warning: Public indexes can contain omissions or indexing differences. Consider a qualified title professional or attorney for a purchase, ownership dispute, easement problem or unreleased lien.
Recorder phone

937-645-3032

Recorder email

recorder@unioncountyohio.gov

Recorder hours

Monday–Friday

7:30 a.m.–4:00 p.m.

Open official Recorder search Open Recorder office page Check current Recorder fees
Board of Revision action plan

Challenge an incorrect property value

File a Board of Revision complaint when the dispute concerns the parcel’s market value—not simply because the tax bill feels high. The Board may raise, lower or leave the value unchanged.

Review the record before filing

Living area and building footprint
Year built, grade and condition
Basement and finished area
Garages, barns and improvements
Land acreage and property class
Recent valid sale
Comparable sales
Damage, demolition or factual errors

File the complaint correctly

Confirm the tax year Only the current tax-year valuation can be contested.
Select the property in Beacon After opening the parcel, use the Petition to Board of Revision option.
Use current DTE 1 State the present value, requested value and factual basis.
Collect supporting documents Use a recent sale, appraisal, comparable sales, photographs, estimates or proof of incorrect parcel facts.
Notarize the complaint Union County requires the filed BOR application to be notarized.
Meet the annual window The complaint must generally be received after January 1 and on or before March 31.
Keep delivery proof Confirm receipt when filing by email, fax or mail.

Official filing methods

Email

auditor@unioncountyohio.gov

Attach the notarized complaint and evidence.

Fax

937-645-3057

Confirm that every page was received.

Mail
Union County Auditor’s Office
Attn: Board of Revision
233 W. 6th St.
Marysville, OH 43040
Recent-sale risk: If a valid recent sale is higher than the Auditor’s value, the Board may use that sale as evidence for an increase. The Board’s possible outcomes are increase, decrease or no change.

After a decision

  • The decision is held for 30 days while an appeal may be filed.
  • Record adjustment and refund or credit processing can take approximately 60 additional days.
  • An appeal generally must be filed within 30 days of the decision letter.
  • A requested change over $50,000 market value, or $17,500 assessed value, requires school-district notification.
  • Attorney help is strongly recommended when property is deeded to a business entity or trust.
Value-review call script “I reviewed parcel [parcel ID] and believe the market value is incorrect because [sale, factual error, damage or comparable evidence]. Can you confirm the correct tax year, DTE form, notarization requirement, deadline and filing method?”
Open Board of Revision information Read BOR procedures and FAQs
Credits, exemptions and farmland

Check owner occupancy, Homestead and CAUV

Union County property-tax relief programs
Program
Main purpose
Important rule
Owner Occupancy Credit
A 2.5% reduction for qualifying owner-occupied residential property.
One property only; rental property is not eligible and an application is required.
Homestead Exemption
Additional relief for eligible senior, disabled, veteran or surviving-spouse homeowners.
Ownership, primary residence, income or disability requirements may apply.
CAUV
Values qualifying agricultural land by agricultural income-producing ability.
Initial application, $25 fee and yearly renewal are required.
Damaged-property deduction
Requests value consideration after qualifying property damage or destruction.
Use current DTE 26 and document the date, cause and extent of damage.

Owner Occupancy Credit

The 2.5% credit is for owner-occupied residential property. A homeowner may receive it on only one property, and rental property is not eligible.

Check before applying: Search the parcel or tax bill for “Owner Occupancy Credit.” A purchaser may also apply through the conveyance statement when buying a qualifying home.

Homestead Exemption

Homestead is separate from owner occupancy. Union County publishes forms for qualifying senior citizens, permanently and totally disabled owners, disabled veterans and certain surviving spouses.

After approval: Homestead generally continues without a new full application each year, but the owner must report loss of ownership, principal residence or qualifying disability status. Special assessments may remain payable.

CAUV agricultural valuation

Basic qualification
  • At least 10 acres devoted to qualifying commercial agricultural use
  • Or less than 10 acres with qualifying average annual gross income of at least $2,500
  • Qualifying use generally during the prior three years
  • Mixed-use parcels may qualify only for independently eligible acreage
Application responsibilities
  • Initial DTE 109
  • One-time $25 fee
  • Annual DTE 109A renewal
  • DTE 102 for an applicable transfer
  • Three-year recoupment risk after loss or withdrawal
CAUV filing window: The initial application must generally be received after the first Monday in January and before the first Monday in March. “Filed” means received by the Auditor, not merely postmarked.

Common Auditor forms

Form finder for common property tasks
Form
Use
Preparation reminder
DTE 1
Board of Revision value complaint.
Confirm tax year, notarization and March 31 deadline.
DTE 105C
Owner Occupancy Credit.
Confirm the property is the qualifying primary residence.
DTE 105A
Standard Homestead application.
Prepare eligibility and income documentation.
DTE 105I
Disabled-veteran Homestead application.
Include required veteran eligibility evidence.
DTE 109
Initial CAUV application.
Confirm acreage or income route and include the $25 fee.
DTE 109A
Annual CAUV renewal.
Submit within the annual filing window.
DTE 102
CAUV property transfer statement.
Use during an applicable ownership transfer.
DTE 26
Destroyed or damaged property deduction.
Document date, cause and extent of damage.
Open current Auditor forms Review Homestead and credits Review CAUV rules
Deeds, splits and conveyance

Handle property transfers and parcel changes

A transfer can require coordinated review by the Auditor, Engineer, Recorder and Treasurer. An incomplete legal description, missing conveyance stamp or wrong form can delay recording.

Published conveyance fee

$4 per $1,000 of consideration or value.

Published parcel fee

$0.50 per parcel, with no fee for TIF numbers or parcel numbers ending in “9.”

Office order for a property transfer

Identify every parcel Save all parcel IDs included in the deed.
Review legal-description requirements A split, combination or corrected description may require Engineer review.
Prepare the conveyance form Use DTE 100 for a taxable transfer or DTE 100EX when a valid exemption applies.
Address Homestead or CAUV status A transfer can require additional tax-reduction paperwork.
Obtain the Auditor conveyance stamp The Recorder accepts mailed conveyances only when the stamp is already affixed.
Submit for recording Pay Recorder fees separately from Auditor conveyance charges.

Prepare for a split or combination

Existing parcel IDs
Current recorded deed
Proposed legal description
Survey or subdivision plat
Owner and buyer information
Conveyance forms
CAUV or Homestead status
Title, attorney or surveyor contact
Do not copy a legal description from GIS. A parcel number, online map label or abbreviated property-card description is not a complete legal description.
Conveyance call script “I am preparing a transfer involving parcel [parcel ID]. The transaction includes [sale, exemption, split, combination, trust, Homestead or CAUV]. Can you confirm the required forms, legal-description review, conveyance charge and office order?”
Review conveyance standards Call conveyance help: 937-645-3077
Phone, address and office routing

Contact the correct Union County property office

Union County property office contacts
Office
Use it for
Contact
Address and hours
Auditor
Parcel search, values, corrections, credits, Homestead, CAUV, conveyance and BOR.
937-645-3003
Fax: 937-645-3057
auditor@unioncountyohio.gov
233 W. 6th St., 2nd Floor, Marysville, OH 43040
8:30 a.m.–4:00 p.m.
Closed 8:30–10:00 a.m. third Tuesday monthly.
Treasurer
Tax bills, payments, posting, escrow, delinquency and payment plans.
937-645-3035
Fax: 937-645-3094
treasurer@unioncountyohio.gov
233 W. 6th St., 2nd Floor, Marysville, OH 43040
8:30 a.m.–4:00 p.m., Monday–Friday.
Recorder
Deeds, mortgages, liens, easements, releases, recording and copies.
937-645-3032
recorder@unioncountyohio.gov
233 W. 6th St., Marysville, OH 43040
7:30 a.m.–4:00 p.m., Monday–Friday.
Engineer
Tax maps, surveys, plats, legal descriptions, splits and combinations.
937-645-3021
engineer@unioncountyohio.gov
233 W. 6th St., Marysville, OH 43040
7:30 a.m.–4:30 p.m., Monday–Friday.
GIS
GIS viewer, layers, map-search and data questions.
maps@unioncountyohio.gov
Confirm assistance or visit arrangements before traveling.

Prepare this before calling or visiting

Parcel ID
Complete property address
Owner name as displayed
Relevant tax year
Deed or instrument reference
Form or application name
Short description of the issue
Supporting screenshots or documents
One useful property-office script “I am contacting you about parcel [parcel ID] at [address]. I need help with [ownership, value, tax payment, map, deed, exemption or transfer]. The public record currently shows [brief fact]. Which official tool, form or office should I use next?”
Nearby Ohio property searches

Check another county when the mailing location is misleading

Mailing cities and school districts can cross expected county-search patterns. Confirm the county before repeating the same owner or address search.

Franklin County

Useful for properties near the southeastern Union County boundary and Columbus-area mailing addresses.

Open Franklin County property-search guide
Delaware County

Useful for eastern Union County boundary areas and Delaware-area property records.

Open Delaware County property-search guide
Madison County

Useful for property near the southern Union County boundary and London-area records.

Open Madison County property-search guide
Public-record limits

What online property records cannot prove

Online tools are useful for
  • Identifying a parcel and owner display
  • Reviewing values, land and building facts
  • Checking tax history and tax distribution
  • Finding maps, deeds, surveys and forms
  • Preparing questions for the correct office
Get additional verification for
  • Legal ownership and title
  • Exact property boundaries
  • Building, zoning or flood approval
  • Liens, easements and encroachments
  • Purchase, lending or legal decisions
Responsible-use warning: Do not identify, accuse or contact someone from an owner-name match alone. Verify the parcel and use public property information lawfully.
Ten practical answers

Union County property search FAQs

How do I search Union County property records by owner name?

Open the official Union County Beacon property search and begin with the owner’s last name. Add a first name or initial only when the results are too broad, then verify the result using the property address and parcel ID.

Can I search a Union County parcel using only an address?

Yes. Begin with the house number or the house number plus the main street word. If no result appears, remove the direction, street suffix, punctuation and unit number.

Why is a recently purchased property still listed under the former owner?

The recorded deed and public Auditor display may not update at exactly the same time. Search the former owner, check the Union County Recorder’s official records and contact the Auditor if the ownership display remains unchanged.

What is the difference between market value and assessed value in Ohio?

Market value is the Auditor’s estimate of open-market property value. Assessed value is generally 35 percent of market value in Ohio and is used with the parcel’s effective tax rates, credits and special assessments to calculate the bill.

Why does tax year 2025 appear on a 2026 Union County tax bill?

Ohio real-estate taxes are collected in arrears. Union County instructs users to review tax year 2025 in Beacon’s Tax History section for the property-tax liability payable during 2026.

Are Union County GIS parcel lines legally exact?

No. GIS lines are useful for locating and comparing parcels but are not legal boundary surveys. Use recorded deeds, plats and surveys and obtain professional help before making a fence, building, driveway, easement or boundary decision.

Where can I find a Union County deed or mortgage?

Use the Union County Recorder’s official-record search. Online images and indexes are available from 1995 to the present, with separate historical indexes for many earlier deeds, mortgages and miscellaneous records.

How do I challenge an incorrect Union County property value?

Review the parcel data, collect value evidence and use the current DTE 1 Board of Revision complaint. The notarized complaint must generally be received after January 1 and on or before March 31 for the applicable filing period.

What is the difference between owner occupancy, Homestead and CAUV?

Owner occupancy is a tax reduction for a qualifying primary residence. Homestead provides additional relief for eligible homeowners. CAUV values qualifying agricultural land according to its agricultural income-producing ability instead of normal development-market value.

Who should I call about a Union County property-tax payment problem?

Call the Union County Treasurer at 937-645-3035 for bills, payment posting, escrow, delinquency and payment plans. Call the Auditor at 937-645-3003 for property values, parcel facts, exemptions, CAUV and Board of Revision questions.

Facts checked July 21, 2026: Search functions, office contacts, office hours, tax dates, penalties, payment fees, GIS guidance, Recorder coverage and fees, Board of Revision procedures, Homestead information, CAUV requirements and conveyance charges were checked against Union County government pages. Recheck the responsible office before a deadline, payment, filing or in-person visit.
Independent guide: CountyAuditors.org is not the Union County Auditor, Treasurer, Recorder, Engineer or Board of Revision. Live ownership, value, tax, payment, map, filing and document information is controlled by the responsible government office. Online property and GIS records should not replace legal, surveying, title, lending or tax advice.
Ohio Auditor Tools · Tax Year 2026

10 Ohio Property Tax Calculators & Auditor Tools

Built specifically for Ohio's 35% assessment ratio, current DTE forms, and 2026 Homestead, Owner-Occupancy, CAUV, Conveyance Fee, and Board of Revision rules. Every number reflects verified Ohio Department of Taxation amounts.

Homestead: $29,000 Enhanced Vet: $58,000 OAGI limit: $41,000 Assessment: 35% of market BOR filing: Free · DTE 1

Annual Tax Bill Estimator

OHIO

Applies Ohio's 35% assessment ratio plus your county's effective millage tier — the actual math your auditor uses.

Pick a county tier and enter your market value.

Homestead Reduction Calculator

DTE 105A

2026 Ohio Homestead: $29,000 general or $58,000 enhanced (100% disabled vet, KIA spouse). OAGI under $41,000 required for non-veteran applicants.

Pick your situation and enter your home value.

Owner-Occupancy & Non-Business Credits

DTE 105C

Every Ohio owner-occupied home qualifies for the 2.5% Owner-Occupancy Credit plus the automatic 10% Non-Business Credit. Most owners don't realize these stack.

Enter your annual tax to see both credit amounts.

Conveyance Fee Calculator

ORC 322

When you sell or transfer Ohio property, the auditor collects $1 state + up to $3 county per $1,000, plus $0.50 per parcel. Counties choose their rate.

Enter sale price and pick your county rate.

CAUV Agricultural Savings

DTE 109

Ohio's Current Agricultural Use Value cuts taxable value dramatically for farmland (10+ acres, or smaller with $2,500+ annual gross income).

Enter both market and CAUV values to see savings.

Mill Rate Converter

Ohio tax rates appear three ways on auditor sites: mills, percent, or dollars per $1,000. Convert between them instantly.

Enter a rate to see all three forms.

Parcel Number Cleaner

Ohio's 88 counties each format parcels differently — Franklin uses 010-123456-00, Cuyahoga uses 001-23-456, Hamilton uses 100-0001-0001-00. Auto-detects.

Paste any Ohio county parcel to format it.

35% Ratio Sanity Check

Ohio law sets taxable value at 35% of market value. If yours is significantly higher, you're a strong BOR appeal candidate.

Enter both values to compare against Ohio's 35% target.

BOR Appeal Savings

DTE 1

A successful Board of Revision complaint typically cuts your value 10–20%. Filing is free and stays in effect until the next reappraisal.

Enter your tax bill and reduction estimate.

BOR Deadline Countdown

MAR 31

Ohio's statutory Board of Revision filing deadline is March 31 for the prior tax year. Miss it and you wait until next year — no extensions.

Set your deadline to start the countdown.

Verify with the official Ohio source

These calculators use the verified 2026 Ohio Department of Taxation amounts and statutory rules. For your exact bill, exemption status, and county-specific deadlines, always confirm with your county auditor and the Ohio Revised Code:

Ohio Dept. of Taxation — Real Property DTE Forms (105A, 105C, 1, 109) ORC 5715 — Board of Revision ORC 5713 — Taxable Real Property ORC 322.02 — Conveyance Fee ORC 319.54(F)(3) — State Fee ORC 5713.30 — CAUV tax.ohio.gov — Main Portal

Estimates use Ohio's 35% statutory assessment ratio and effective tax rate tiers averaged across major Ohio counties. Your actual bill depends on local school levies, voted millage, inside vs. outside millage splits, House Bill 920 reduction factors (HB 920), and special assessments. The 2026 Homestead general amount ($29,000) and enhanced amount ($58,000) reflect HB 187 inflation indexing — your county auditor's office may show slightly different transitional figures. Nothing here is legal or tax advice. CountyAuditors.org is an independent informational directory, not affiliated with any county government.

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