Censum sells a monitoring plan, so take this with that in mind. Here is the test we would apply, starting with what the county's own record shows.
Between tax years 2023 and 2024, 20,332 of the 98,989 Cook County parcels with a Senior Freeze lost it: 20.5 percent. On 19,074 of them, the senior exemption, which renews itself, stayed on the record. The freeze is different. It has to be applied for every year, under a household income limit that was $65,000 through tax year 2025 and is $75,000 for tax year 2026.
The lines that renew themselves fell off far less often. That gap is the honest answer to "is monitoring worth it": for some properties, yes. For most, a calendar reminder and the free check do the job.
Quick Answer
Monitoring is worth paying for when something about the property is likely to change between appeal windows: a Senior Freeze that must be refiled, a recent purchase, an upcoming reassessment, an active condo building, a rental, or more than one parcel. It is usually not worth it for a long-held home whose exemptions renew themselves, in a quiet market. Much of the basic watching you can do yourself for free.
Which lines fall off
Share of parcels with each exemption in tax year 2023 that did not have it in tax year 2024:
- Homeowner (renews automatically): 35,852 of 1,000,026 parcels missing in 2024 (3.6%).
- Senior (renews automatically in Cook): 14,187 of 348,469 parcels (4.1%).
- Persons with Disabilities (renews automatically through tax year 2027 under current law): 1,535 of 27,919 parcels (5.5%).
- Senior Freeze (apply every year, income limit): 20,332 of 98,989 parcels (20.5%).
Counts cover parcels on both the 2023 and 2024 rolls.
Read it carefully. Sales explain many of these losses, especially on the homeowner line. Some owners died, moved, or crossed the income limit. Some lines may have been restored later by a Certificate of Error, which this data does not show. A missing line is a question, not proof of an error.
But the freeze stands out, and some of those losses are only a year long. On 9,843 parcels, the freeze was on the 2022 record, missing in 2023, and back in 2024. On 9,566 of them, the senior exemption stayed on the record all three years. If that household qualified in 2023, the missing year can still be claimed through a Certificate of Error, which currently covers tax years 2021 through 2025.
That is the job monitoring does: notice the year a line goes missing while it can still be fixed.
What monitoring actually watches
Censum's Tax Shield plans watch for:
- Changes to the property's assessment
- Appeal windows and deadline reminders
- Nearby sales, including same-building condo sales where records support it
- Clues that an exemption may be missing
Then they point you toward an appeal only when the numbers look worth it. Monitoring does not file anything for you.
The plans, at today's prices:
- Consumer Tax Shield, $99 a year: one home
- Investor Shield, $299 a year: up to 20 residential investment properties
- Investor Shield Premium, $499 a year: up to 20 properties, plus up to five qualifying appeal packages at $49 each
All three renew every year.
What you can do yourself, free
- Put the Assessor's calendar in your phone. Your township's appeal dates are published on the Assessor's site.
- Read the exemption lines every fall. The second-installment bill lists each exemption applied. A missing line is a reason to act.
- Refile the Senior Freeze every year, if you have it. Put the filing season in your calendar the day you file.
- Look up your PIN after notices mail. The Assessor's site shows your current value.
- Run the free Censum check once a year. It takes about ten seconds and needs no signup.
If you will reliably do those things, you may not need to pay anyone.
Who probably should not pay
- You have owned the home for years and your exemptions renew themselves and show on every bill.
- Your assessment has been steady and close to what similar homes sell for.
- You live in a township that is not up for reassessment soon.
- You are comfortable checking the calendar and your bill yourself.
Who probably should
- Senior Freeze households. The one line in the table that has to be refiled every year is the one that fell off a fifth of the time.
- Recent buyers. Your exemptions need to be set up in your name, and your first reassessment may be coming.
- Owners heading into a reassessment year. Chicago in 2027, the north suburbs in 2028, the south and west suburbs in 2029.
- Owners who won a reduction before. The next reassessment starts from a fresh value, and someone should compare it with the value you won.
- Condo owners. Same-building sales are some of the best evidence, and they come and go quickly.
- Rental and investment owners. No homeowner exemption, more parcels, and more windows to track.
- Heirs of an inherited home. Exemptions tied to the previous owner stop, and the paperwork is easy to lose track of.
The break-even math
At $99 a year, monitoring pays for itself if it catches one thing in a few years.
A missing homeowner exemption is $10,000 off equalized assessed value (EAV). At an illustrative 9% local rate, that is about $900 a year. One caught exemption covers roughly nine years of the consumer plan.
A lost Senior Freeze is usually bigger. The median freeze on the tax year 2024 record took $25,839 off EAV. At the same illustrative 9% rate, that is about $2,326 for one year.
A missed appeal window is harder to price, because not every appeal wins. If your home has a real case and you would otherwise forget to file, monitoring is cheap insurance.
If nothing ever happens to the property, you have paid $99 a year for quiet. For some owners, that is fine.
Questions to ask any monitoring service
- What exactly triggers an alert, and how often is the data refreshed?
- Which sources does it use, and are they dated?
- Does it file anything, or only tell you?
- Does it take a percentage of any savings it finds? Censum does not.
- How do you cancel?
The numbers behind this article
Counts are Censum's tabulation of PIN-level exemption amounts, tax years 2021 through 2024, in PTAXSIM, the Cook County Assessor's Office research database built from Clerk and Treasurer records. They count parcels, not people. The Assessor describes PTAXSIM results as not official, and corrections made after the bill may not show.
FAQ
Does Tax Shield file appeals for me?
No. It watches and tells you when a property looks worth acting on. Appeal packets are separate.
Is monitoring included with anything?
The $199 360-Appeal bundle includes one year of Consumer Tax Shield. After that year it renews at $99 a year, and you can cancel anytime.
Does it cover commercial property?
No. Tax Shield covers residential property. Commercial income-property work is separate.
Which exemption is most likely to drop off?
In the county record, the Senior Freeze. 20.5% of parcels with it in tax year 2023 did not have it in 2024, against 3.6% to 5.5% for lines that renew themselves.
Will it guarantee I save money?
No. It points you to opportunities. The county decides exemptions and the Board of Review decides appeals.
Sources
- Censum Tax Shield plans
- Cook County Assessor, Assessment Calendar and Deadlines
- Cook County Assessor, Homeowner Exemption
- Cook County Assessor, Senior Freeze Exemption
- Cook County Assessor, Certificates of Error
- 35 ILCS 200/15-172, Senior Citizens Assessment Freeze
- Censum tabulation of PIN-level exemption amounts, tax years 2021-2024, from PTAXSIM (Cook County Assessor's Office, built from Clerk and Treasurer records), run November 7, 2026; parcel counts.
Sources accessed November 7, 2026.
Next step
Run the free check first. If your property fits one of the "should" groups above, monitoring may be worth it. Run the free check first
Censum LLC is a data and analytics company, not a law firm and not a tax advisor. You file your own appeal. Censum is independent and is not affiliated with Cook County or any government agency.