Property tax appeal help

Challenge a home assessment increase with better evidence.

HomeTaxChallenge helps homeowners confirm the county record, compare similar homes with recent nearby sales, and decide for themselves whether to file. Information only.

County-specific appeal rules Full comps screening or lite preliminary estimates Plain-English comparable-sales ranges
Currently live: full support (comps and estimator) in many Illinois counties, plus lite preliminary assessed-value estimates in more Illinois counties and across Wisconsin. See the supported-counties coverage directory.

Find your county

Start typing your county to see whether it is supported. If it is not live yet, join the notification list and help us prioritize where to build next.

Why appeal

A higher assessment can mean years of higher taxes.

If the county values your home above similar nearby homes, a successful appeal can lower the assessed value used to calculate your bill. Even a few hundred dollars a year can add up.

Watch for

A sharp assessment increase

Your notice shows a new assessed value or estimated home value that feels out of line with recent sales.

Check

Comparable homes

Lower sales or lower assessments for similar homes can support an overvaluation or equity argument.

Look for

Record mistakes

Wrong square footage, bathroom count, condition, classification, or lot facts can make the assessed value too high.

Act before

The local deadline

Many counties only accept assessment complaints during a short window after notices are published.

What you get

A fast screening report before you spend hours on forms.

The estimator helps you understand the case before you commit time to gathering evidence, printing pages, and filling out county paperwork.

1

Find the parcel

Confirm the official address, parcel number, current assessment, and recent tax-rate context.

2

Compare similar homes

Review nearby sales and property facts such as living area, beds, baths, age, and sale price per square foot.

3

Review the range

See an automated low, mid, and high comparable-sales range (house value). Information only; not an appraisal.

4

Download the summary

Get a PDF with the subject property, selected comparables, the automated comp range, and general filing information.

Learn

Guides for homeowners who want to understand the appeal process.

Read the county guide, browse city pages, or use the estimator when your county is supported.