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See what the $49 Audit can contain

Your Property Assessment Audit provides an appeal packet when supported by the evidence, or a valuation and county-record report when an appeal is not supported. Check your address first to see the evidence and recommended deliverable available for your property.

Cook County · Official sources checked October 4, 2026

Find evidence before deciding what to buy

Cook County Assessor uniformity research. Board of Review requirements and deadlines are separate. Confirm the current instructions for your office and assessment year before filing.

Find your property
Open the free CookViewer map and search your address or PIN. Select the property and use Compare this Property to see candidate records.
Check the comparison basis
Review neighborhood, class, building and land size, age and construction. Same class alone is not enough. Assessment comparisons are not sale prices; explain important differences rather than selecting only the lowest values.
Save the actual records
Follow the Assessor’s illustrated upload guide. Its optional uniformity attachments allow up to six comparable PINs, using individual PDFs or one Excel file. For a PDF, use the prescribed filename: Comparable PIN [the comparable’s PIN].pdf. Verify current requirements before uploading.
Build an evidence index
For each record, note its PIN, source, assessment year, retrieval date, relevant similarities and differences, and attachment filename. Keep the source document with your notes. A typed summary is not the underlying evidence.

Open free CookViewer · Official attachment instructions · How to judge comparability

The Assessor says its analysts examine comparable properties for uniformity appeals even if you do not attach your own comparables. Buying a kit or researching your own list is not a requirement to file.

Check relevance before collecting attachments. Teaching example, not a customer property: a 1,600-square-foot, 22-year-old home and a nearby 1,500-square-foot, 23-year-old home may warrant comparison. A 1,100-square-foot, 50-year-old home is not made comparable merely by sharing their class code. This follows the Assessor’s example; no assessment, sale price or savings is established.

An evidence-index entry you can use

Blank preparation structure, not a researched property or a filed appeal:

PIN: [from record] · Assessment year: [verify] · Source and date checked: [record] · Similarities: [describe] · Differences to resolve: [describe] · Attachment: Comparable PIN [PIN].pdf

Record the actual assessment basis. Do not turn an assessment into a sale price or invent an adjustment.

Free help, the $29 kit, or a $49 Audit?

Use official help first if that meets your need. The county supplies research and filing tools. Wheeling Township offers appeal assistance, including instructions to request filing help. Check your own township’s service and current window. We are not affiliated with these offices.
$29 Illinois kit: the guide above plus a preparation plan, editable evidence worksheets and a letter using your supplied details. You collect and verify the records. This is optional organization, not a researched comparable report or a government form.
$49 Audit: analysis of the available property records and comparisons, with an appeal or valuation report according to the evidence. Check your address and preview the result first. A no-case result is not a recommendation to appeal; insufficient evidence does not become a researched case by purchasing a kit.

The complete Harris PDF below demonstrates a different county’s output. Its source appendix does not establish equivalent Cook coverage. Neither product files an appeal or guarantees a reduction.

Preview the Illinois $29 kit Check available evidence for my address

Real public records · Harris County, Texas · 2026

What a supported comparison looks like

HCAD lists this example home at $475,370. Our comparison estimate is $440,834, a $34,536 difference. The county value is 7.8% above that estimate. This is a reason to review the evidence—not a finding that the county is wrong or a promised tax reduction.

The home has 2,168 recorded square feet, was built in 2006, and has HCAD quality grade B. The analysis screened 40 same-grade neighborhood records using the calculator's size, age and consistency checks. Below are the first three of the ten displayed comparisons, in their original order.

Assessment records, not sale prices
HCAD account	County market value	Sq ft / built
Example home 0051170000007	$475,370	2,168 / 2006
Comparable 1 1282730010001	$468,065	2,164 / 2006
Comparable 2 1281870010008	$449,262	2,219 / 2006
Comparable 3 1293200010001	$455,173	2,172 / 2007

Source: HCAD certified account and residential-building files, updated September 20 and retrieved September 23, 2026. This noncustomer example was selected to show a positive comparison; it is not a typical-results claim. Your result may not support an appeal. Condition, renovations, exemptions and filing eligibility still need review. Check the official protest deadline for your notice. This September 2026 example does not establish an open filing window.

Your $49 report: your property's analysis, displayed comparisons, source references, a personalized letter when supported, and filing and hearing guidance. You review and file it yourself. We do not represent you or guarantee savings.

Check my address · Free →

No researched evidence for your address? The $29 DIY kit is available nationally to help you organize your own records and prepare.

Open the complete report behind this example

This 14-page PDF was generated September 28, 2026 by the same document generator used for paid Audits. It uses the frozen Harris records above, including all ten displayed comparisons. Names and street addresses are omitted, and every page is marked SAMPLE — DO NOT FILE. It is a selected noncustomer example, not a typical result or a current filing recommendation.

Open complete Harris Audit sample · 14 pages

What we prepared in this report

Pages 2–3: findings and comparisons. County values, property characteristics and the comparison estimate. These are assessment records, not verified sale prices or an adjusted appraisal.
Pages 4–7: evidence sources. The subject and ten comparison account identifiers, source references, assessment year and retrieval date.
Pages 8–11: preparation for filing. Hearing guidance, a property-specific letter draft and the local filing checklist. The draft is not a completed government form or proof of filing.

What remains for the homeowner

Review the records and comparison relevance; add any needed condition, repair or other supporting evidence; confirm your notice deadline and eligibility; complete required official forms; sign, submit and attend any required hearing. We do not file or represent you.

Your address may produce a different report or no supported appeal case. The free check shows which output is available before payment. Source appendices and documents vary by jurisdiction; this Harris example does not establish equivalent evidence coverage elsewhere.

The two PDF illustrations below were generated September 11, 2026 using the paid-output template. Their property names, values, comparisons and 2% tax rate are synthetic. They demonstrate the document format, not the real-record example above, a customer result or a savings forecast. Every page is marked “DO NOT FILE.”

Appeal example

Illustrates the filing-focused output when the evidence supports an appeal. Includes the evidence table, letter, filing guidance and hearing preparation. This Texas illustration is not a form for another state.

View appeal PDF · 10 pages

Valuation example

Illustrates a result that does not support an appeal. Includes property and comparable-value analysis with neutral context. It is not an appeal letter or a promise of tax savings.

View valuation PDF · 5 pages

What to inspect before buying

Sources and dates. Check the county-record source and assessment year for your result. Stored public records are not necessarily a live assessor feed.
Value basis. Assessed value, the county's market-value opinion and comparable-property values can differ. Exemptions, caps, assessment ratios and tax rates affect whether a value reduction changes the bill.
Comparable relevance. Review location, property type, size, age and missing characteristics. Similar assessments alone do not establish a market-value appeal.
Your work. Verify the records, correct missing information, check the current official deadline and forms, submit the appeal and attend any required hearing. We do not file or represent you.

Page count, forms and evidence vary by property, state and output. The separate $29 State DIY Appeal Kit is a guide and workbook; it does not include a property-specific comparable analysis. Compare current products and refund terms.

Historical public-record examples: Texas and Florida

These older examples use public records frozen July 17 (Harris) and July 18 (Miami-Dade), 2026. The PDFs were generated July 30 and August 14. They are historical illustrations, not current property analyses or instructions to file. Their tax and five-year figures are hypothetical calculations, not documented savings. Verify current county requirements independently.

Historical Texas PDF · Historical Florida PDF

Check the evidence for your address

Preview the result and limitations before deciding. Property-specific evidence varies by county and address.