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Mount Prospect property tax appeal 2026: deadline by township
Mount Prospect is split between 2 Cook County townships, and each has its own 2026 appeal dates. Most homes are in Elk Grove Township (53% of residential parcels) and Wheeling (47%). Your deadline depends on the township your home is in, not on the city.
Mount Prospect appeal deadlines 2026 by township
| Township | Assessor | Board of Review |
|---|---|---|
| Elk Grove Township53% of Mount Prospect's parcels | closed Aug 4 | closed Sep 29 |
| Wheeling Township47% of Mount Prospect's parcels | open until Oct 22 | not announced yet |
Not sure which township your home is in? It is printed on your assessment notice, or type your address in the free check below. Dates: Assessor's calendar and Board of Review dates, checked on October 9, 2026.
Mount Prospect homes at a glance
- 17,925 residential (class 2) parcels, of them 12,341 houses and 4,227 condominium units.
- Main ZIP codes: 60056.
- Township split: Elk Grove 9,550, Wheeling 8,375 parcels.
Property tax on a typical Mount Prospect house
Our estimate for the median house in Mount Prospect: about $10,200 a year (median 2025 assessed value $42,000). An appeal lowers the assessed value, which is one part of that bill; exemptions, the state equalizer and local tax rates are the others.
Our calculation from Cook County open data, not official figures and not your bill: 2025 final assessed value × the 2025 state equalizer × the 2025 tax rate of the home's tax code, minus the homeowner exemption, for 12,338 houses (classes 202–209, 234, 278).
Mount Prospect homeowners at the Board of Review last year
For tax year 2025, 1,389 Mount Prospect homeowners filed on their own at the Board of Review for a house, and 1,036 of them got a lower value.
Private houses, appeals filed without an attorney. Source: Cook County Board of Review open data (Appeal Decision History), our analysis, not official figures. Results for every township.
How to appeal in Mount Prospect
- Find your township. It is on your assessment notice; the free check below shows it from your address.
- File with the Cook County Assessor while your township's window is open. Filing is free and online; you don't need to hire anyone.
- Board of Review is a second chance. When the Board opens your township, you can file there too, also free.
Step by step: how to appeal · choosing comparables · Assessor or Board of Review.
Questions
Which township is Mount Prospect in?
Mount Prospect is split between Elk Grove (53%), Wheeling (47%) townships, by our count of residential parcels. Your assessment notice shows yours.
What is the Mount Prospect property tax appeal deadline in 2026?
It depends on the township. Elk Grove Township: Assessor last file date August 4, 2026, Board of Review August 31, 2026 to September 29, 2026. Wheeling Township: Assessor last file date October 22, 2026.
Do I appeal to the City of Mount Prospect?
No. Assessment appeals in Cook County go to the Cook County Assessor and then the Board of Review. Filing with either is free.
How much property tax does a typical Mount Prospect house pay?
Our estimate for the median house is about $10,200 a year, from 2025 assessed values and tax rates in county open data. It is not an official figure; your bill shows your own amount.
About Cook Tax Check
Cook Tax Check is an independent service run by Virix Ltd. We are not the county and not a law firm. Our check of your home against similar homes is free. If it looks worth appealing, our document packet costs $49. Savings Guarantee: no savings? Your next appeal is on us. If the Assessor says no, we prepare your Board of Review appeal for free, and if neither office lowers your value, your appeal package for next tax year is on us (terms). You file yourself, for free, on the county's website — we don't file or represent anyone. See a sample packet.
Nearby
Sources
- Cook County Assessor — assessment calendar and deadlines
- Board of Review — dates and deadlines
- Cook County open data — Parcel Universe
- Cook County open data — Assessed Values
- Cook County Assessor — residential appeals
Dates last checked against the Assessor's calendar and the Board of Review's published dates on October 9, 2026. If anything here differs from the county's own pages, the county's pages win.