HonestCasa logoHonestCasa
Updated 2025 Tax Year

Williams County
Property Tax Guide

Everything you need to know about property taxes in Williams County, OH. Rates, due dates, exemptions, and how it affects your monthly payment.

10 Official Sources
8 min read
Quick Facts
Tax Rate
Approximately 1.03% effective rate, varies significantly by taxing district and location within county
Exemptions
5+ Available
Section 1

How Property Tax Works

Williams County, Ohio operates on a property tax system that funds essential local services including schools, townships, municipalities, and county operations. For the 2025 tax year, the effective property tax rate is approximately 1.03% of assessed value. However, actual tax rates vary significantly by location within the county due to overlapping special taxing districts such as school districts, fire districts, library districts, and municipal levies.

Property taxes in Williams County are assessed on the fair market value of real estate and are collected semi-annually. The Ohio Department of Taxation requires counties to reassess all properties every six years, with triennial updates in between. Williams County's assessment system follows state guidelines where residential property is assessed at 35% of fair market value, while commercial and industrial properties may have different assessment ratios.

Your specific tax rate depends on which taxing districts serve your property location. Rural properties typically have lower rates than those within municipalities or special service districts. It's important to review your tax bill carefully to understand which levies apply to your specific parcel, as rates can vary from under 1% to over 1.5% depending on local ballot initiatives and district boundaries.

Section 2

What Makes Up Your Tax Bill

ComponentApproximate RateDescription
County General0.15-0.25%Basic county services, courts, sheriff
School District0.35-0.55%Local school operations (varies by district)
Township/Municipality0.05-0.20%Local government services
Fire/EMS Districts0.05-0.15%Emergency services
Library Districts0.02-0.05%Public library systems
Other Special Districts0.05-0.15%Parks, soil & water, etc.
Total Effective Rate~1.03%2025 Levy Year Average

Note: These rates apply to the 2025 levy year and represent typical ranges across Williams County. Your actual rate depends on which specific taxing districts serve your property location. School district rates vary significantly between districts within the county, and additional voted levies may increase rates in specific areas.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Williams County, property taxes are due in two installments:

Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes in Williams County are additional property tax assessments that occur when there are changes to a property's assessed value during the tax year. Common triggers include new construction completion, major improvements or additions, ownership transfers that reveal unreported improvements, or corrections to previous assessments.

When supplemental taxes are levied, they are calculated based on the difference between the old and new assessed values, multiplied by the current tax rate for your specific taxing districts. The supplemental tax is prorated based on the number of months remaining in the tax year from when the change took effect.

For example, if you complete a $50,000 home addition in June, and your property is assessed at 35% of market value ($17,500 increase in assessed value), with a 1.03% tax rate, your annual supplemental tax would be approximately $180. Since the improvement was completed mid-year, you would pay roughly half that amount ($90) for the remaining months of the current tax year, with the full amount incorporated into subsequent year's regular tax bills.

Example Calculation

Example 1: $300,000 Home

  • Market Value: $300,000
  • Assessed Value (35%): $105,000
  • Less: Homestead Credit (if eligible): -$2,500
  • Net Taxable Value: $102,500
  • Annual Tax (1.03%): $1,056
  • Monthly Escrow: $88

Example 2: $600,000 Home

  • Market Value: $600,000
  • Assessed Value (35%): $210,000
  • Less: Homestead Credit (if eligible): -$2,500
  • Net Taxable Value: $207,500
  • Annual Tax (1.03%): $2,137
  • Monthly Escrow: $178

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value (35%): $350,000
  • Less: Homestead Credit (if eligible): -$2,500
  • Net Taxable Value: $347,500
  • Annual Tax (1.03%): $3,579
  • Monthly Escrow: $298

Note: Homestead Credit amounts are estimates and require annual application. Additional credits may be available for seniors, disabled persons, or veterans. All credits require separate applications and are not automatically applied.

See How Taxes Affect Your Payment

Property taxes are just part of your total monthly cost. Get the full picture.

Calculate Now
Section 5

Escrow & Property Taxes

Most mortgage lenders in Williams County require borrowers to maintain an escrow account for property tax payments, especially when the loan-to-value ratio exceeds 80%. Your lender collects monthly escrow payments along with your mortgage payment, typically 1/12th of your annual property tax bill plus a small cushion for potential increases.

Property taxes in Williams County are due February 15th and July 20th each year. Your lender will pay these installments directly to the Williams County Treasurer from your escrow account. It's important to note that tax bills are mailed approximately 30 days before each due date, and your lender should receive and pay these bills on time to avoid penalties.

You should receive an annual escrow analysis from your lender showing how your payments were applied and any adjustments needed for the following year. If your property taxes increase due to reassessment or new levies, your monthly escrow payment may increase accordingly. You have the right to request escrow account details and can verify payments were made correctly by checking with the Williams County Treasurer's office or viewing your account online.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are property taxes due in Williams County for 2025? A: Real estate taxes are due February 15th and July 20th, 2025. Mobile home taxes are due March 1st and July 31st. The first installment of any installment plan must be paid by January 31st.

Q: What is the Homestead Credit and how do I apply? A: The Homestead Credit is available to homeowners who are 65 or older, or totally disabled. This credit limits assessment increases rather than reducing market value. You must apply annually with the Williams County Auditor's office. Applications are typically due by the first Monday in June.

Q: Are there other tax credits available in Williams County? A: Yes, Ohio offers various credits including the Disabled Veterans Credit, Senior Citizens Credit, and Current Agricultural Use Valuation (CAUV) for qualifying farmland. All credits require separate applications and are not automatically applied to your tax bill.

Q: How often are properties reassessed in Williams County? A: Ohio law requires counties to conduct full reappraisals every six years with triennial updates. Williams County follows this schedule, with the most recent updates affecting tax bills accordingly.

Q: What happens if I pay my property taxes late? A: Late payments incur penalties and interest charges. After February 15th, a 10% penalty is added to the first half payment. After July 20th, a 10% penalty applies to the second half. Additional interest accrues monthly on unpaid balances.

Q: Can I pay my property taxes online? A: Yes, Williams County typically offers online payment options through the County Treasurer's website. Check the official Williams County website for current payment methods and any associated convenience fees.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Williams County Board of Revision within 30 days of receiving your tax valuation notice. You can also file complaints about current tax year valuations by March 31st of the tax year.

Q: Why do property tax rates vary within Williams County? A: Tax rates differ based on which school district, municipality, township, and special districts (fire, library, parks) serve your property. Each district sets its own millage rates through voter-approved levies, creating varying total rates across the county.

Q: What triggers a supplemental tax assessment? A: New construction, major improvements, ownership changes that reveal unreported improvements, or corrections to previous assessments can trigger supplemental taxes. These are prorated based on when the change occurred during the tax year.

Q: Do I automatically receive tax credits if I'm eligible? A: No, most tax credits require annual applications. Even if you received credits in previous years, you typically must reapply each year by the specified deadlines. Contact the Williams County Auditor's office for specific application requirements and deadlines.

See the Full Picture of Your Home Costs

Property taxes are just one piece of homeownership. HonestCasa helps you understand your total monthly cost and explore safe ways to access your home equity.

Total Monthly Cost

Mortgage + taxes + insurance + HOA

Equity Growth

Track how your equity grows over time

Safe Equity Access

Options for projects or debt payoff

Free • No credit check • 2-minute estimate