Generate a professional Illinois property tax abatement request letter. Challenge your assessment under Illinois law with a clear, statute-backed demand letter.
Generate My Letter — $19If you own property in Illinois and believe your tax bill is too high, you have legal rights to challenge that assessment. Illinois law allows property owners to request an abatement or reduction of property taxes when assessments are inaccurate, when properties qualify for special exemptions, or when local taxing bodies have authority to grant relief. A well-crafted abatement request letter is often the first step before formal appeal to the Board of Review or the Illinois Property Tax Appeal Board (PTAB). Because Illinois operates with strict deadlines tied to publication dates that vary by township and county, acting quickly matters. This page explains how Illinois property tax abatement law works, what your letter should contain, and how to preserve your rights to further appeal if your initial request is denied.
Illinois property taxes are governed by the Property Tax Code, 35 ILCS 200/1-1 et seq. Assessments are made at the township or county level, with most properties assessed at 33⅓% of fair market value (Cook County uses different classification ratios). When an owner believes the assessed value exceeds market value, is unequal compared to similar properties, or fails to reflect a qualifying exemption, the owner may pursue several remedies. First, an informal review with the local assessor can sometimes correct obvious errors. Second, a formal complaint may be filed with the County Board of Review under 35 ILCS 200/16-55, which must be filed within 30 days of the publication of the assessment list for that township. Third, taxing districts themselves have statutory authority under 35 ILCS 200/18-165 to abate taxes for specific qualifying properties, including new industrial development, affordable housing, historic properties, and properties in enterprise zones. Separately, 35 ILCS 200/23-5 allows refunds and abatements for taxes paid on assessments later found to be erroneous. Common grounds for abatement or reduction include: incorrect property characteristics (square footage, lot size, condition), uniformity violations where comparable properties carry lower assessments, recent arms-length sales below assessed market value, qualification for the homestead, senior citizen, senior freeze, disabled persons, or veterans exemptions, and clerical or mathematical errors. Cook County has its own procedures through the Cook County Assessor and Cook County Board of Review with separate filing windows by township. After exhausting Board of Review remedies, owners may appeal to PTAB within 30 days or file a tax objection complaint in circuit court.
A property tax abatement request letter in Illinois works best when it functions as both a persuasive document and a procedural placeholder. Address the letter to the appropriate decision-maker: the township or county assessor for informal review, the County Board of Review for formal complaints, or the relevant taxing district board for statutory abatements under 35 ILCS 200/18-165. Identify the property by Property Index Number (PIN), legal description, and address. State the current assessed value, the value you believe is correct, and the resulting tax impact. Then build your case with evidence: recent appraisals, comparable sales within the last 12 to 24 months, photographs documenting condition issues, assessments of comparable neighboring properties showing uniformity violations, and proof of qualifying exemptions. Cite the specific statutory authority you rely on, whether 35 ILCS 200/16-55 for assessment complaints, 35 ILCS 200/15-170 et seq. for exemptions, or 35 ILCS 200/23-5 for refunds of erroneous assessments. Request a specific outcome: a revised assessed value, a refund of overpaid taxes with interest, or formal abatement. Set a reasonable response deadline and preserve your right to escalate to the Board of Review, PTAB, or circuit court. A clear, evidence-based letter often resolves matters without a formal hearing and creates a written record that supports later appeals if needed.
Filing deadlines in Illinois are jurisdictional and unforgiving. Board of Review complaints must be filed within 30 days of the publication of your township's assessment list, with publication dates varying widely. PTAB appeals must be filed within 30 days of the Board of Review's final decision. There is generally no filing fee at the Board of Review; PTAB charges a modest filing fee that varies by claimed reduction amount. Tax objection complaints in circuit court require payment of taxes under protest and have separate deadlines under 35 ILCS 200/23-10. Small claims court (Illinois limit $10,000) is generally not the proper forum for assessment disputes, though it may be used for related refund claims. Cook County has separate, shorter township-by-township windows.
Property tax in Illinois is governed by the Illinois Property Tax Code (35 ILCS 200/1-1 et seq. (appeals: 35 ILCS 200/16-160; PTAB: Article 16, Div. 5)). Assessment cycle: General (quadrennial) reassessment every four years in most counties; Cook County reassesses on a triennial (three-year) cycle by geographic triad. Assessment date is January 1 of the tax year. Assessed value: 33 1/3% (one-third) of fair market value statewide (the Illinois Department of Revenue targets a 33.3% level of assessment). Cook County uses classification: approximately 10% for residential and 25% for commercial/industrial, reconciled via a state equalization multiplier.
Illinois Department of Revenue (state oversight/equalization); county Boards of Review and township/county assessors (local); Illinois Property Tax Appeal Board (PTAB) for statewide appeals. The window to act is short — board of Review: within 30 days of publication of the township assessment list (deadlines vary by county/township). Property Tax Appeal Board (PTAB): petition must be postmarked within 30 days of the Board of Review's final written decision; faxed/emailed appeals not accepted.
A recent change to watch: 2025-2026 reforms: General Homestead Exemption maximum set (up to $10,000 for 2025, with 2026+ indexed to lesser of 5% or CPI); Senior Freeze income limit raised from $65,000 (2025) to $75,000 (2026). Property tax debt/tax-sale reform (2026 legislation) aimed at helping homeowners retain equity, extending Cook County's annual tax-sale schedule.
First-level appeal: County Board of Review (BOR) — a quasi-judicial body providing an informal venue to resolve assessed-value disputes (some counties allow an informal review with the township/county assessor first). In Cook County, an initial appeal may be filed with the Cook County Assessor before the Board of Review.
Exemptions to claim: General Homestead Exemption (up to $10,000 EAV in Cook County / $6,000 in other counties for 2026); Senior Citizens Homestead Exemption ($5,000, age 65+); Senior Citizens Assessment Freeze (income limit raised to $75,000 for tax year 2026); Returning Veterans' Homestead Exemption ($5,000 for two years); Disabled Veterans' Standard Homestead Exemption ($2,500 for 30-49% disability, $5,000 for 50-69%, total exemption for 70%+); plus Home Improvement and Persons with Disabilities exemptions.
Appeal deadline: Board of Review: within 30 days of publication of the township assessment list (deadlines vary by county/township). Property Tax Appeal Board (PTAB): petition must be postmarked within 30 days of the Board of Review's final written decision; faxed/emailed appeals not accepted.
Next-level appeal: Illinois Property Tax Appeal Board (PTAB) — a five-member statewide quasi-judicial body; alternatively, taxpayers may seek judicial review by filing a tax objection complaint in the circuit court. PTAB decisions are reviewable by the Appellate Court under the Administrative Review Law.
Grounds you can raise: Overvaluation (assessment exceeds 33 1/3% of fair market value) and lack of uniformity/assessment inequity (property assessed higher than comparable properties). Decisions are based on equity and the weight of the evidence (35 ILCS 200/16-160).
Evidence that works: Comparable sales, comparable assessments (equity/uniformity grids), recent independent appraisals, a recent arm's-length purchase price, and documentation of property condition or income/expense data. PTAB weighs comparables by similarity in age, design, size, and features.
How your value is assessed: 33 1/3% (one-third) of fair market value statewide (the Illinois Department of Revenue targets a 33.3% level of assessment). Cook County uses classification: approximately 10% for residential and 25% for commercial/industrial, reconciled via a state equalization multiplier.
The hearing: Board of Review: informal hearings (written submission or in-person). PTAB: appeals may be decided on written evidence submissions; a formal in-person or telephonic hearing may be requested. The Illinois Supreme Court has affirmed that payment of the tax is NOT a prerequisite to appeal to PTAB.
First, county Board of Review (BOR) — a quasi-judicial body providing an informal venue to resolve assessed-value disputes (some counties allow an informal review with the township/county assessor first). In Cook County, an initial appeal may be filed with the Cook County Assessor before the Board of Review.
If that fails, illinois Property Tax Appeal Board (PTAB) — a five-member statewide quasi-judicial body; alternatively, taxpayers may seek judicial review by filing a tax objection complaint in the circuit court. PTAB decisions are reviewable by the Appellate Court under the Administrative Review Law.
Mind the deadline: board of Review: within 30 days of publication of the township assessment list (deadlines vary by county/township). Property Tax Appeal Board (PTAB): petition must be postmarked within 30 days of the Board of Review's final written decision; faxed/emailed appeals not accepted.
$19 flat. State-specific. Ready in 5 minutes.
Fight My Property Tax →