Montgomery County property tax appeal 2027: deadline, forms and how to file
To appeal a Montgomery County assessment, file with the Montgomery County Board of Review in person; in Illinois the deadline is 30 days after the township assessment list is published (Cook County uses township filing windows). Confirm the exact date on your notice or with the assessor; we add each county's 2027 date here when it is published.
Each county publishes its assessment list or changes in a local newspaper, township by township, on or before December 31 (35 ILCS 200/12-10). Dates vary by county.
Data as of 20 Oct 2026 · Montgomery County Board of ReviewCheck your own assessment
Free. We compare the value on your notice with recent sales of similar homes nearby and tell you whether an appeal is worth filing. Have your assessment notice and tax bill handy.
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How to file in Montgomery County
- Step 1
File the appeal
Use the method your notice lists, by the deadline on the notice.
- Step 2 · before the hearing
Prepare and submit your evidence
Overvaluation must be shown by a preponderance of the evidence; a uniformity (equity) claim needs clear and convincing evidence. The strongest evidence is a recent arm’s-length purchase of your home, or an appraisal as of January 1. Otherwise use at least three comparable sales, or for equity at least three similar nearby homes with their assessments and property record cards, in a grid. Bring a photo of your home and its property record card.
- Step 3
Meet, then hear
An informal review with Township assessor or Supervisor of Assessments comes first; if you decline the offer, the Montgomery County Board of Review hears the case. Most reductions happen at the first step.
Before you file: how to read your notice · evidence that works · informal vs formal hearing · when not to appeal
Forms
| Form | Number | Use | Format |
|---|---|---|---|
| Non-Farm Assessment Complaint Form (2026) | — | Complaint on non-farm property to the Montgomery County Board of Review | |
| Farm Assessment Complaint Form (2026) | — | Complaint on farm property to the Montgomery County Board of Review | |
| Residential Appeal (Property Tax Appeal Board) | PTAB-1A | Only after the Board of Review decides: the state appeal, due 30 days after the board’s written notice. Can also be filed online through PTAB eFile. | Fillable PDF |
Appeal levels
| Level | Who hears it | Deadline | Cost |
|---|---|---|---|
| Informal review | Township assessor or Supervisor of Assessments | Before the Board of Review deadline | Free |
| Board of Review | Montgomery County Board of Review | 30 days after the assessment list is published | Free |
| Property Tax Appeal Board | Illinois Property Tax Appeal Board (state) | 30 days after the Board of Review’s written decision | No filing fee |
| Court | Circuit court (administrative review), or a tax objection in Montgomery County circuit court | 35 days after the PTAB decision; tax objections follow the tax-bill penalty date | Court costs |
What evidence the board accepts
Overvaluation must be shown by a preponderance of the evidence; a uniformity (equity) claim needs clear and convincing evidence. The strongest evidence is a recent arm’s-length purchase of your home, or an appraisal as of January 1. Otherwise use at least three comparable sales, or for equity at least three similar nearby homes with their assessments and property record cards, in a grid. Bring a photo of your home and its property record card.
Montgomery County questions
When is the Montgomery County appeal deadline for 2027?
No 2027 date is published yet. The board’s rule: BOR rules (Rule 3.1): complaints may be filed from the first Monday in June through 30 calendar days after publication by the Supervisor of Assessments, whichever is later; the county's assessment complaints page says the last day to file is 30 days after publication for all townships and to contact the Supervisor of Assessments for the exact date. No complaints are accepted after the deadline (Rule 3.6).
How do I appeal my assessment in Montgomery County?
File the Non-Farm Assessment Complaint Form (2026) with the Montgomery County Board of Review, 1 Courthouse Square, Room 201, Hillsboro, IL 62049. Mailed complaints count as filed on the postmark date.
Should I talk to the assessor first?
Yes. The township assessor or the Montgomery County Supervisor of Assessments can fix record errors informally. Still file with the Montgomery County Board of Review by the deadline: a board complaint is required before any state appeal.
What evidence works best?
A recent arm’s-length purchase of your home or an appraisal as of January 1. Otherwise, at least three comparable sales, or three similar nearby homes with lower assessments, with property record cards and photos.
How do I contact the Montgomery County Supervisor of Assessments?
Mail: Montgomery County Board of Review, 1 Courthouse Square, Room 201, Hillsboro, IL 62049. Phone: 217-532-9595. Hours and walk-in details: montgomerycountyil.gov.
What if the Board of Review says no?
Appeal to the Illinois Property Tax Appeal Board within 30 days of the board’s written decision. There is no fee, and you can file online through PTAB eFile. A lowered value on an owner-occupied home carries over for the rest of the assessment period.
Check whether yours is over-assessed
Nearby counties
Bond County · Macoupin County · Christian County · Fayette County · Madison County · Sangamon County · Shelby County
- Montgomery County - Assessment Complaints
- Montgomery County - Board of Review
- Montgomery County - Supervisor of Assessments
- Montgomery County - Board of Review Rules and Regulations (2025 PDF)
- Illinois State Board of Elections - County Officers directory (Supervisor of Assessments entries)
- 35 ILCS 200/16-55 — Board of Review complaints
- 35 ILCS 200/12-10 — Publication of assessments
- 35 ILCS 200/16-160 — Appeal to the Property Tax Appeal Board
- Illinois DOR — Assessment Appeals
- Property Tax Appeal Board — Filing your appeal
- Property Tax Appeal Board — FAQ
- U.S. Census Bureau, county population estimates (2024) and county gazetteer (2024).