Proviso Township property tax appeal 2026
Proviso Township homeowners can appeal their 2026 assessment with the Cook County Assessor until Tuesday, October 27, 2026. Filing is free and online, and you do not need a lawyer.
- File by Oct 27
- Free to file
- About 15 minutes
Updated October 22, 2026. Dates from the Cook County Assessor and Board of Review calendars.
5 days left
Is your Proviso Township home assessed too high?
Free check from the county’s own records. About 10 seconds.
Key dates for Proviso Township
Every township gets two chances a year: the Assessor first, then the Board of Review.
Done
Assessor appeals open
Monday, September 14, 2026
Assessment notices mailed
Next
Last day to file with the Assessor
Tuesday, October 27, 2026
Coming
Board of Review appeals
Dates not published yet
Towns in Proviso Township
- Maywood
- Bellwood
- Berkeley
- Broadview
- Forest Park
- Hillside
- Westchester
- Melrose Park (part)
Some towns are split between townships. Your assessment notice names yours, and our free check sorts it for you.
What the public records show
We checked 44,963 homes in Proviso Township against the county’s 2026 assessments and recorded sales. 16,198 (36%) are assessed higher than similar homes nearby or above what similar homes sold for, with a median estimated saving of about $642 a year.
Share of homes that may be assessed too high, by town
- Westchester35%2,487 of 7,141
- Maywood39%2,371 of 6,077
- Bellwood31%1,734 of 5,657
- Forest Park33%1,522 of 4,591
- Melrose Park38%1,671 of 4,433
- La Grange Park35%1,467 of 4,197
- Brookfield40%1,463 of 3,647
- Hillside34%870 of 2,586
- Broadview42%1,068 of 2,566
- Berkeley40%701 of 1,734
Estimates from public records, not a promise; the county decides every appeal.
How to file with the Cook County Assessor, step by step
For the window that is open now. Illustrations, not screenshots; the county’s site may look a little different.
- 1
Find your PIN
Your 14-digit property index number is on your assessment notice and your tax bill, and at the top of a Morganwell packet.
- 2
Open the Assessor's appeal site
Go to cookcountyassessoril.gov/online-appeals, sign in or create a free account, and start a residential appeal for your PIN by October 27, 2026.
- 3
Choose the reason
Lack of uniformity (similar homes are assessed lower), overvaluation (similar homes sold for less), or your own recent purchase price.
- 4
Describe it and state your value
Write a sentence or two, or paste the statement from your packet, and enter the fair market value you are asking for.
- 5
Upload your evidence
Upload your packet as a PDF. You can attach more documents after you submit, as long as your township is still open.
- 6
Submit and save the confirmation
You get an email confirming the filing and one with your docket number. The decision comes by mail. If it is not enough, you can appeal again at the Board of Review.
The ways homes usually win
Lack of uniformity
Your home is assessed at more per square foot than similar homes in the same neighborhood and class. Three to five comparable homes nearby make the case.
Overvaluation
Similar homes sold for less than the value the county gives yours. Recent arm's-length sales count; foreclosure auctions and bank sales do not.
Your own purchase
If you bought recently for less than the county's value, your closing price is strong evidence. The Assessor asks about sales in the last two years, the Board of Review the last three, and you must disclose a sale in that time either way.
Condo owners: the strongest evidence is usually recent sales of other units in the same building.
What good evidence looks like
Similar homes, side by side, compared per square foot. Here the first home is assessed higher than its neighbors.
| Home | Address | Sq ft | County value | Per sq ft |
|---|---|---|---|---|
| Your home | 1200 Example Ave | 1,450 | $312,000 | $215 |
| Similar home | 1214 Example Ave | 1,420 | $268,000 | $189 |
| Similar home | 1309 Sample St | 1,500 | $279,000 | $186 |
| Similar home | 1122 Model Ct | 1,390 | $255,000 | $183 |
An illustration with made-up homes. Your packet lists the real comparable homes with their PINs, addresses and county values.
After you file
- Step 1
Assessor decides
Usually several weeks after the township's window closes. The result comes by mail.
- Step 2
Board of Review
Not lowered enough? Appeal again when the township opens there. You can file there even if you skipped the Assessor.
- Step 3
State appeal board
Still disagree? You can go to the Illinois Property Tax Appeal Board within 30 days of the Board of Review's decision.
Proviso Township was last fully reassessed in 2026; the next full reassessment is in 2029.
Proviso Township appeal questions
- When is the Proviso Township property tax appeal deadline in 2026?
- The Cook County Assessor accepts 2026 appeals for Proviso Township until Tuesday, October 27, 2026. The Board of Review opens its own window later in the year; it has not published the dates yet.
- Which towns are in Proviso Township?
- Maywood, Bellwood, Berkeley, Broadview, Forest Park, Hillside and Westchester, plus parts of Melrose Park. Your assessment notice names your township.
- Was Proviso Township reassessed in 2026?
- Yes. The Cook County Assessor reassessed Proviso Township in 2026, so homeowners received new estimated market values. The next full reassessment is in 2029.
- Does it cost anything to appeal?
- No. Filing with the Cook County Assessor and with the Board of Review is free, and homeowners can file for themselves without a lawyer.
- How do I know if my home is assessed too high?
- Compare it with similar homes nearby: same neighborhood, class, size and age. If yours is assessed higher per square foot than most of them, or above what similar homes sold for, that is the evidence the county asks for. Morganwell's free check does this comparison from the county's own records.
- Can I appeal at the Board of Review if I did not appeal with the Assessor?
- Yes. The Board of Review accepts appeals whether or not you filed with the Assessor first.
- How many Proviso Township homes may be assessed too high?
- Morganwell checked 44,963 homes in Proviso Township against the county's 2026 assessments and recorded sales. 16,198 of them (36%) are assessed higher than similar homes nearby or above what similar homes sold for, with a median estimated saving of about $642 a year. These are estimates from public records, not a promise; the county decides.
- Can condo owners appeal?
- Yes. For a condominium unit the strongest evidence is usually recent sales of other units in the same building. Morganwell's free check covers condo units as well as houses.
Guides for other townships
Morganwell is not a law firm and does not give legal or tax advice. You file your own appeal. Packets are compilations of public records, not appraisals. No outcome is guaranteed.