Sangamon County property tax appeal 2027: deadline, forms and how to file
To appeal a Sangamon County assessment, file with the Sangamon County Board of Review by mail; 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.
Assessment changes are published by township. For 2026 the county listed publication dates of 8/6/2026 (Capital Township) through 10/29/2026 (Cartwright), with notices mailed about two days before publication.
Data as of 20 Oct 2026 · Sangamon 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 Sangamon 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 Sangamon 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 |
|---|---|---|---|
| Assessment Complaint (printed per parcel) | — | Owner looks up the parcel on the county Property Tax website, clicks Go, then Reports/Forms: For Tax Payers, then Assessment Complaint to print the pre-filled form | Online |
| 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 | Sangamon 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 Sangamon 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.
Sangamon County questions
When is the Sangamon County appeal deadline for 2027?
No 2027 date is published yet. The board’s rule: The county posts a township-by-township table (date published, date mailed, filing deadline) on its assessment complaint page. In the 2026 table the filing deadline was about 30 days after publication, e.g. Capital 9/8/2026, Gardner, Loami and Maxwell 11/9/2026, Chatham, Illiopolis, Lanesville and Talkington 11/23/2026, Cartwright 11/30/2026; townships not yet published were left blank.
How do I appeal my assessment in Sangamon County?
File the Assessment Complaint (printed per parcel) with the Sangamon County Board of Review, Sangamon County Supervisor of Assessments, 200 S. Ninth Street, Springfield, IL 62701. Mailed complaints count as filed on the postmark date.
Should I talk to the assessor first?
Yes. The township assessor or the Sangamon County Supervisor of Assessments can fix record errors informally. Still file with the Sangamon 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 Sangamon County Supervisor of Assessments?
Mail: Sangamon County Supervisor of Assessments, 200 S. Ninth Street, Springfield, IL 62701. Phone: 217-753-6805. Hours and walk-in details: sangamonil.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
Menard County · Christian County · Morgan County · Logan County · Cass County · Mason County · Macoupin County
- Sangamon County Supervisor of Assessments
- Sangamon County Assessment Complaint Form and Board of Review Filing Deadlines
- Sangamon County Clerk - Tax Assessments FAQ
- Illinois State Board of Elections County Officers directory
- 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).