Check If You're Overpaying
See your Cook County tax assessment and the Assessor's appraisal of your home, estimate your property taxes, and find out in under a minute if you qualify for an appeal.
Cook County Tax Appraisal & Property Tax Calculator
Check If You're Overpaying
See your Cook County tax assessment and the Assessor's appraisal of your home, estimate your property taxes,
and find out in under a minute if you qualify for an appeal.
Sample property, for illustration only
The Cook County Assessor appraises every property once every three years, estimating what it would sell for (its market value). Your assessment is a share of that appraisal: for a home, 10% of market value. Your tax bill is worked out from the assessment, so an appraisal that is too high makes your bill too high. This calculator shows both figures for your property, and if the appraisal is too high, you can appeal it.
You can find your assessment three ways. On the Cook County Assessor's website, search your address or 14-digit PIN to see your property's assessed value, the market value behind it and the details the Assessor has on record. When your township is reassessed, the Assessor also mails you a notice with the new value. And your second-installment tax bill shows the assessed value the bill was figured on. To see whether your assessment is higher than similar homes nearby, enter your address above for a free property check.
Our Cook County property tax calculator shows if you are overpaying on property taxes using real assessor data. We analyze your property the same way professionals do when filing a property tax appeal in Cook County. Instead of giving a basic estimate, we check the 3 main legal reasons to reduce your property taxes:
Your Cook County tax is your market value, times the assessment level, times the state equalization factor, minus your exemptions, times your local tax rate. The assessment level is 10% for homes and apartment buildings, and 25% for most commercial property. The Illinois Department of Revenue sets the state equalization factor each year. Our Cook County property tax calculator uses the same method as the Assessor to estimate your taxes and find savings. We break your property tax calculation into simple steps:
Estimate your property's market value based on recent sales and comparable properties
Apply the 10% residential assessment level to get assessed value
Multiply by the state equalization factor to get your equalized assessed value (EAV)
Subtract your exemptions (Homeowner, Senior, etc.) from the EAV
Multiply by your local tax rate to get your tax bill
This step-by-step method powers our Cook County Property Tax Calculator—built to deliver accurate estimates and uncover real savings opportunities.
Own a commercial or apartment building? See how commercial property tax appeals work ->
The most powerful way to reduce your Cook County property taxes is by analyzing your assessed value per square foot (AV/SF) compared to similar properties:
Why This Helps You Save Money?
If your property's assessed value per square foot is higher than comparable properties, you are likely overassessed—and may be able to:
Our Cook County property tax calculator shows if you are overpaying on property taxes using real assessor data. We analyze your property the same way professionals do when filing a property tax appeal in Cook County. Instead of giving a basic estimate, we check the 3 main legal reasons to reduce your property taxes:
We compare your property to similar homes in your area.
What This Means:
If your property is assessed higher than similar homes, you may qualify for a property tax reduction, even if your value is correct.
We check if your assessed value matches what homes actually sell for.
What This Means:
If your value is too high, you may have a strong case for a Cook County tax appeal based on overvaluation.
We review your property details for mistakes that increase your tax bill.
What This Means:
Fixing these errors can lower your property taxes and increase savings.
Your Cook County tax is your market value, times the assessment level, times the state equalization factor, minus your exemptions, times your local tax rate. The assessment level is 10% for homes and apartment buildings, and 25% for most commercial property. The Illinois Department of Revenue sets the state equalization factor each year. Our Cook County property tax calculator uses the same method as the Assessor to estimate your taxes and find savings. We break your property tax calculation into simple steps:
Estimate your property's market value based on recent sales and comparable properties
Apply the 10% residential assessment level to get assessed value
Multiply by the state equalization factor to get your equalized assessed value (EAV)
Subtract your exemptions (Homeowner, Senior, etc.) from the EAV
Multiply by your local tax rate to get your tax bill
This step-by-step method powers our Cook County Property Tax Calculator—built to deliver accurate estimates and uncover real savings opportunities.
Own a commercial or apartment building? See how commercial property tax appeals work ->
The most powerful way to reduce your Cook County property taxes is by analyzing your assessed value per square foot (AV/SF) compared to similar properties:
Why This Helps You Save Money?
If your property's assessed value per square foot is higher than comparable properties, you are likely overassessed—and may be able to:
Once you enter your property address, our calculator instantly generates a comprehensive property tax analysis based on real Cook County data. This is not just a quick estimate—you'll see a full property profile, tax breakdown, and appeal analysis organized into easy-to-understand sections.
Summary
Our calculator analyzes your property using the same property characteristics relied upon by the Cook County Assessor and Board of Review. Based on your results, you may be overassessed if:
Your assessed value per square foot exceeds comparable properties
Your property value exceeds recent market sales
You are missing exemptions you qualify for
NEXT STEP: REDUCE YOUR PROPERTY TAXES
We review your property using real Cook County data to determine if your assessment is too high and if you have a strong case for an appeal.
Once you enter your property address, our calculator instantly generates a comprehensive property tax analysis based on real Cook County data. This is not just a quick estimate—you'll see a full property profile, tax breakdown, and appeal analysis organized into easy-to-understand sections.
Confirms calculations are based on your exact property.
A quick snapshot of where your tax dollars are going.
Errors in these details directly impact your taxes.
Shows whether an exemption you qualify for is missing.
Understand how your taxes are calculated step by step.
Shows if your property has been successfully reduced.
Determines if assessed value aligns with market activity.
Summary
Our calculator analyzes your property using the same property characteristics relied upon by the Cook County Assessor and Board of Review. Based on your results, you may be overassessed if:
Your assessed value per square foot exceeds comparable properties
Your property value exceeds recent market sales
You are missing exemptions you qualify for
Next: Reduce Your Property Taxes
We review your property using real Cook County data to determine if your assessment is too high and if you have a strong case for an appeal.
Check If You're Overpaying
If our calculator shows potential savings, our team can review your property and handle the entire appeal process for you.
Check If You're Overpaying
If our calculator shows potential savings, our team can review your property and handle the entire appeal process for you.
What we look for
Appeals must be filed when your specific township is "open" for filing. This happens twice a year: once at the Assessor's Office and once at the Board of Review. Our system tracks these windows automatically. They last about six weeks at the Assessor and about 30 days at the Board of Review. Not open yet? Sign up now. When your township's new assessments are published, we review your property and file if the record supports an appeal. How a Cook County property tax appeal works, step by step ->
No. A successful appeal lowers your assessed value for tax purposes. It does not change what your home is worth or what a buyer may pay for it.
Our fee is 25% of your first-year tax savings, invoiced only after your assessment is reduced. If there is no reduction, there is no fee.
Not quite. The Cook County Assessor appraises every property once every three years, estimating what it would sell for (its market value). Your assessment is a share of that appraisal: for a home, 10% of market value. Your tax bill is worked out from the assessment, so an appraisal that is too high makes your bill too high. This calculator shows both figures for your property, and if the appraisal is too high, you can appeal it.
What we look for
Appeals must be filed when your specific township is "open" for filing. This happens twice a year: once at the Assessor's Office and once at the Board of Review. Our system tracks these windows automatically. They last about six weeks at the Assessor and about 30 days at the Board of Review. Not open yet? Sign up now. When your township's new assessments are published, we review your property and file if the record supports an appeal. How a Cook County property tax appeal works, step by step ->
No. A successful appeal lowers your assessed value for tax purposes. It does not change what your home is worth or what a buyer may pay for it.
Our fee is 25% of your first-year tax savings, invoiced only after your assessment is reduced. If there is no reduction, there is no fee.
Not quite. The Cook County Assessor appraises every property once every three years, estimating what it would sell for (its market value). Your assessment is a share of that appraisal: for a home, 10% of market value. Your tax bill is worked out from the assessment, so an appraisal that is too high makes your bill too high. This calculator shows both figures for your property, and if the appraisal is too high, you can appeal it.