Separating public records from a professional opinion
Distinguish between public property records and professional valuations in Illinois to make informed, objective decisions during your home search.
The short answer
In Illinois, separating objective public records from professional opinions is critical for effective decision-making. Property tax records and assessment history are public data, whereas appraisals and market advice are professional opinions. Understanding this distinction prevents buyers from conflating historical data with current market value, ensuring that negotiations remain rooted in verifiable evidence rather than speculative assumptions.
Interpreting Public Property Tax Records
Property assessment records in Illinois are open to public inspection. They show historical tax levies and EAV, which inform you about the property's tax history. However, these records are not appraisals of fair market value. They reflect government-determined values used for tax collection purposes only.
Illustrative Planning Example: Use the county assessor's online portal to review the last three years of EAV history to understand the property's tax trajectory.
Defining Professional Appraisal vs. Public Data
An appraisal is an independent valuation conducted by a professional to determine a home's worth for lending purposes. Unlike public tax records, which are based on specific formulas like 33 1/3 percent of value (outside Cook County), an appraisal accounts for current market conditions, property condition, and comparable sales.
Decision Worksheet: Create a column for 'Public Data' (tax records) and 'Professional Opinion' (appraisal). Compare the two to understand the difference between tax liability and market value.
Analyzing Disclosure Statements as Records
The seller's disclosure report is a legally required record of actual knowledge regarding material defects. It is not an inspection or an expert opinion on the home's condition. Sellers are not required to perform investigations to complete the form, meaning the report only reflects known, existing information.
Ask a Professional: Ask if a general home inspection is recommended to supplement the seller's disclosure, which is only a baseline of known defects.
Strategic Use of Financial Estimates
Loan Estimates are professional projections of costs. They are not finalized charges. While they use accurate loan data, they are estimates. Distinguish between these professional projections and fixed government costs like property taxes and mandatory recording fees when planning your total budget.
Decision Worksheet: List each cost on your Loan Estimate, categorizing them into 'Lender Estimates' (negotiable or projections) and 'Government/Fixed Fees' (non-negotiable).
Checklist
- Access your county's public property tax database
- Obtain a copy of the official property assessment
- Distinguish tax liability from fair market value
- Review the seller's written disclosure report
- Request an independent appraisal from your lender
Common questions
Is the tax assessment the same as the home's value?
No. The tax assessment is a percentage of fair market value used for tax purposes. It does not necessarily represent the current market price or what you might pay for the home.
Can I appeal an assessment if it seems too high?
Yes, administrative appeals for assessments can be filed with the Illinois Property Tax Appeal Board, though this process should be pursued before receiving your tax bill.
Sources
- CFPB — Buying a houseChecked October 12, 2026
- CFPB — Loan Estimate explainerChecked October 12, 2026
- Illinois Residential Real Property Disclosure ActChecked October 12, 2026
- Illinois Department of Revenue — Property tax overviewChecked October 12, 2026
This guide is general educational content from SQFT IO, prepared with AI assistance. It is not legal, tax or loan advice. Talk with a licensed attorney, tax professional or lender about your situation. SQFT IO Illinois license 478.027617.