Peoria County, Illinois · Peoria
The September 30, 2026 deadline has passed.See what you can still do →Peoria County property tax appeal guide
Peoria County assesses property at one-third of market value. AppealMyTax's live parcel data converts that assessed value to its market basis and compares the home only with same-county residential peers; 64,460 Peoria residential parcels and alternate situs-address aliases were loaded from the county's official 2026 roll on September 5, 2026. You appeal through the Peoria County Supervisor of Assessments / Board of Review; Illinois uses a written complaint to your County Board of Review (Illinois has no statewide form) filed with the County Board of Review.
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Peoria County appeal deadline
September 30, 2026 (passed)
Missed it? Here is what you can still do →
Peoria County's Board of Review publishes September 30 as its 2026 filing deadline; confirm the current filing schedule and complaint packet before submitting.
Illinois has no single statewide deadline. In Cook County, complaints are filed township by township on the dates printed in the township's reassessment notices (35 ILCS 200/16-115), so your window depends on where you live and reopens each reassessment cycle. In every other county, the deadline is on or before 30 calendar days after your township's assessment list is published (35 ILCS 200/16-55). Check your county Board of Review's calendar for your township's dates.
How to appeal in Peoria County
1. Watch for your township's reassessment notice
In Cook County, townships are reassessed on a rolling three-year cycle and each mails its own notice; your filing window runs from that notice (35 ILCS 200/16-115). Outside Cook, watch for your township's assessment list to be published.
2. File a complaint with the Board of Review
Cook County: file by your township's deadline. Every other county: file on or before 30 calendar days after the assessment list is published (35 ILCS 200/16-55). There is no filing fee. Note that the statute calls this a complaint, not an appeal, at this stage.
3. Build your evidence
Two arguments work. Overvaluation: recent sales of similar homes show your market value is too high, which you prove by a preponderance of the evidence. Lack of uniformity: comparable properties are assessed lower per square foot than yours, which under Kankakee County Board of Review v. Property Tax Appeal Board, 131 Ill. 2d 1 (1989), requires clear and convincing evidence.
4. Board of Review decision
The Board of Review reviews your complaint and may correct your assessment (35 ILCS 200/16-95 in Cook). It issues a written decision.
5. PTAB or Circuit Court (optional)
If you disagree, you may appeal to the state Property Tax Appeal Board within 30 days of the board's written decision (35 ILCS 200/16-160). Alternatively, you may pay under protest and file a tax objection in Circuit Court after exhausting the Board of Review (35 ILCS 200/23-5, 23-10).
Peoria County property tax FAQ
What is the property tax appeal deadline in Peoria County, Illinois?
September 30, 2026. Peoria County's Board of Review publishes September 30 as its 2026 filing deadline; confirm the current filing schedule and complaint packet before submitting. Illinois has no single statewide deadline. In Cook County, complaints are filed township by township on the dates printed in the township's reassessment notices (35 ILCS 200/16-115), so your window depends on where you live and reopens each reassessment cycle. In every other county, the deadline is on or before 30 calendar days after your township's assessment list is published (35 ILCS 200/16-55). Check your county Board of Review's calendar for your township's dates.
What form do I use to appeal in Peoria County?
Illinois uses a written complaint to your County Board of Review (Illinois has no statewide form), filed with the County Board of Review. There is no filing fee to appeal.
What is the property tax appeal deadline in Illinois?
There is no single statewide date. Cook County files township by township on the dates printed in each township's reassessment notice (35 ILCS 200/16-115). Every other county runs 30 calendar days from publication of the assessment list (35 ILCS 200/16-55). Check your County Board of Review's calendar.
Other Illinois counties
Is your Peoria County home over-assessed?
Free check, no signup. Review the available comparable-property evidence, then choose the $49 Property Assessment Audit. Your results determine whether you receive an appeal packet or a valuation report. If you appeal, complete your county's required forms and submit them yourself. One-time payment, no contingency fee, 30-day refund.
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