HonestCasa logoHonestCasa
Updated 2025 Tax Year

Washtenaw County
Property Tax Guide

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

9 Official Sources
8 min read
Quick Facts
Tax Rate
25-45 mills (2.5%-4.5% of assessed value), varies by municipality and school district
1st Due
Jul 1
2nd Due
Dec 1
Exemptions
5+ Available
Section 1

How Property Tax Works

Washtenaw County's property tax system funds essential local services including public schools, county government operations, municipal services, libraries, and various special districts. Property taxes are levied based on the assessed value of real property and are the primary funding source for local governments throughout the county. The county includes diverse communities from urban Ann Arbor to rural townships, each with varying tax rates based on their specific service needs.

Property tax rates in Washtenaw County typically range from approximately 25 to 45 mills (2.5% to 4.5% of assessed value), though actual rates vary significantly by location due to different combinations of school districts, municipalities, and special taxing districts. Each property's total tax rate is determined by combining the millage rates of all applicable taxing authorities that serve that specific location, including the county, local municipality or township, school district, library districts, and any applicable special assessment districts.

Section 2

What Makes Up Your Tax Bill

ComponentTypical Rate RangeDescription
County Operating4.0-5.5 millsBasic county services, courts, sheriff
School District18.0-28.0 millsK-12 education, varies by district
Municipal/Township2.0-8.0 millsLocal government services
Library District1.0-2.0 millsPublic library operations
Community College2.5-3.0 millsWashtenaw Community College
Special Assessments0.5-5.0 millsParks, transit, fire services (varies by location)
Total Range25.0-45.0 millsCombined rate varies by specific location

Note: These rates apply to the 2024 tax year (levied in 2024, due in 2025). One mill equals $1 per $1,000 of assessed value. Your actual rate depends on the specific combination of taxing authorities serving your property location. Contact the Washtenaw County Equalization Department for your exact millage rate.

Section 3

When Are Property Taxes Due?

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

First Installment
Jul 1
Delinquent after Dec 10
Second Installment
Dec 1
Delinquent after Apr 10
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 Washtenaw County are additional tax bills issued when there are changes to property ownership, value, or use that occur after the annual assessment date but before the end of the tax year. The most common triggers include property sales that result in uncapped assessed values, completion of new construction or major improvements, and changes in property classification or exemption status.

When a supplemental tax is triggered, it covers the difference between the original annual tax and what the tax should be based on the new circumstances, prorated for the remaining months in the tax year. For example, if a property sells in June and loses its homestead exemption, the new owner would receive a supplemental bill for the additional school taxes owed from June through December. These supplemental bills are typically issued within 30-60 days of the triggering event and have separate due dates from regular tax bills.

Example Calculation

Example 1: $300,000 Property

  • Market Value: $300,000
  • Assessed Value (50%): $150,000
  • Less Homestead Exemption: -$18,000 (school taxes only)
  • Taxable Value: $150,000 (homestead), $132,000 (school portion)
  • Annual Tax (35 mills avg): $5,130
  • Monthly Escrow: $428

Example 2: $600,000 Property

  • Market Value: $600,000
  • Assessed Value (50%): $300,000
  • Less Homestead Exemption: -$18,000 (school taxes only)
  • Taxable Value: $300,000 (homestead), $282,000 (school portion)
  • Annual Tax (35 mills avg): $10,470
  • Monthly Escrow: $873

Example 3: $1,000,000 Property

  • Market Value: $1,000,000
  • Assessed Value (50%): $500,000
  • Less Homestead Exemption: -$18,000 (school taxes only)
  • Taxable Value: $500,000 (homestead), $482,000 (school portion)
  • Annual Tax (35 mills avg): $17,470
  • Monthly Escrow: $1,456

Note: Homestead exemption requires annual application and only applies to school taxes. These examples use average millage rates; actual rates vary by location.

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 require borrowers to maintain an escrow account for property taxes, collecting monthly payments along with principal and interest to ensure taxes are paid on time. Lenders typically collect 1/12 of the annual tax bill each month, plus a cushion of 2-3 months of payments to account for rate increases. In Washtenaw County, with winter taxes due February 14 and summer taxes due in July or September (varies by municipality), lenders usually make payments directly to the appropriate tax collecting unit on behalf of homeowners.

Property owners should verify that their lender has the correct tax amounts, as escrow shortages can result in significantly higher monthly payments when annual escrow analyses are conducted. If you receive tax bills directly despite having an escrow account, forward them immediately to your lender to ensure proper payment. Homeowners can request annual escrow account statements and should review them for accuracy, particularly after assessment changes or millage rate adjustments.

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 Washtenaw County? A: Winter taxes are due February 14, 2025. Summer tax due dates vary by municipality - most townships have summer taxes due September 14, while some cities collect annually. Check with your local treasurer for specific dates.

Q: What homestead tax credit is available and how do I apply? A: The Principal Residence Exemption (homestead exemption) reduces school taxes by exempting up to $18,000 of assessed value for 2024. You must apply annually by May 1 with your local assessor's office using Form 2368. This is not automatic and requires yearly renewal.

Q: Is there a property tax credit for seniors or disabled persons? A: Yes, qualified seniors and disabled persons may be eligible for property tax deferrals or exemptions based on income limits. Applications must be filed with the local assessor by the specified deadlines. Contact your township or city assessor for specific income thresholds and application forms.

Q: How often are properties reassessed in Washtenaw County? A: All properties are assessed annually as of December 31. Assessment notices are mailed in March, and property owners have until the second Tuesday in May to appeal their assessment to the local Board of Review.

Q: What happens if I pay my taxes late? A: Interest and penalties accrue on unpaid taxes. Winter taxes become delinquent March 1 and are transferred to county collection with additional fees. Properties with delinquent taxes for three years may be subject to foreclosure proceedings.

Q: Can I pay my property taxes online? A: Yes, most Washtenaw County municipalities offer online payment options through their websites or third-party processors. Contact your local treasurer's office for available payment methods and any associated convenience fees.

Q: How do special assessment districts affect my tax rate? A: Special districts for services like parks, libraries, fire protection, or transit add additional millage to your total rate. Your specific combination depends on your property location. The county equalization department can provide a breakdown of all millages affecting your property.

Q: What is Proposal A's assessment cap and how does it work? A: Proposal A limits annual assessment increases to 5% or the inflation rate, whichever is less, for properties that don't change ownership. When property is sold, the assessed value "uncaps" to 50% of market value, often resulting in significantly higher taxes for new owners.

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