County Housing Costs

Washington County, WI property tax

Official source data 2024

On a $400,000 home in Washington County

$4,411

estimated annual property tax

$368monthly budget
1.10%county effective rate

ACS 2020-2024 ratio of medians. This estimate does not use your parcel’s assessment or district tax rates.

Make it your number.

Washington County, Wisconsin

Your actual bill depends on your local assessment, exemptions, and taxing districts.

A home value. A yearly budget.

These scenarios use the same 1.10% effective rate. They do not predict an individual tax assessment.

Property tax scenarios in Washington County
Home valueAnnual estimateMonthly budget
$100,000$1,103$92
$150,000$1,654$138
$200,000$2,205$184
$250,000$2,757$230
$300,000$3,308$276
$350,000$3,859$322
$400,000$4,411$368
$450,000$4,962$414
$500,000$5,513$459
$600,000$6,616$551
$750,000$8,270$689
$1,000,000$11,027$919
$1,250,000$13,783$1,149
$1,500,000$16,540$1,378
$1,750,000$19,297$1,608
$2,000,000$22,053$1,838

The county context.

Median tax bill$3,802
Median home value$344,800
Rate rank within Wisconsin62 of 72

Rank runs from highest to lowest among counties with usable ACS medians. County medians may describe different households and cannot replace parcel-level figures.

Neighboring counties

Same home value in neighboring counties
CountyEffective rateSame-value estimateMedian tax paid
Milwaukee County, WI1.93%$7,705$4,444
Waukesha County, WI1.14%$4,575$4,554
Sheboygan County, WI1.39%$5,563$3,236
Fond du Lac County, WI1.51%$6,041$3,365

Up to four adjacent counties with usable ACS medians, ordered by population. The 2026 Census adjacency file includes point contacts and boundaries in water.

What can change your bill?

The ACS effective rate is a ratio of medians, not a statutory rate. Local assessed values, levies, classification, caps and exemptions determine the actual bill.

Exemptions & assessment

No uniform flat exemption is applied. Enter your assessor-provided assessment ratio and qualifying exemption for a separate statutory scenario.

Payment dates & appeals

Ordinary real-property bills may use January 31 and July 31 installments. Municipalities can offer other authorized schedules; read the bill because late payment can end installment eligibility.

After checking the assessment with the assessor, follow the local Board of Review schedule. Ordinarily give notice of intent to object at least 48 hours before its first meeting and submit the required objection; waiver rules are limited.

Check Wisconsin’s official property-tax guidance

Use an assessed value, exemption, and local millage

This separate scenario needs your assessor’s inputs. An exemption applies only to eligible levies; do not apply it to the county’s historical effective rate.

1 mill = $1 per $1,000 of taxable assessed value.

Good questions. Clear answers.

How much is property tax on a $400,000 home in Washington County?

The historical effective-rate estimate is $4,411 per year, or $368 a month. It multiplies $400,000 by 1.10%.

Is the effective rate the rate on my tax bill?

No. It is median real-estate taxes paid divided by median home value in the ACS 2020-2024 survey. Your taxing districts, assessed value, classification and exemptions determine your bill.

Can I subtract a homestead exemption from this estimate?

Use the separate statutory scenario with a qualifying levy. Subtracting an exemption from an ACS effective-rate estimate can double-count relief already reflected in taxes paid.

Does a higher purchase price change my assessment?

Assessment rules and reassessment dates vary by state and locality. Contact the linked official property-tax office before relying on a historical county ratio.

How do I appeal a property-tax assessment?

Read the deadline and procedure on your assessment notice, then use the official state guidance above to locate your assessor or review board. County survey data does not establish your appeal deadline.

Check the source.

Data as of 2024. Retrieved .

Read the assumptions and calculation methods