Picture the envelope from the Cook County Assessor's Office landing in an Orland Park mailbox this year: a new Fair Market Value noticeably higher than the one issued three years ago, and the homeowner doing the math they think they're supposed to do, bigger number, bigger bill, time to panic or time to appeal. That math is wrong, and understanding why matters more this year than most, because 2026 is Orland Township's turn in the county's reassessment cycle, and the notices are rolling out on a township-by-township schedule that started earlier this year and continues into the fall.
The percentage printed on your notice is not a preview of your next tax bill. It's a preview of your share of a pie that's also changing size. If you're listing a home this fall, refinancing, or just trying to figure out whether an appeal is worth your weekend, the real question isn't what your number did. It's what your number did relative to everyone else's.
Why Orland Township Is In Play This Year
Cook County runs a triennial reassessment cycle, meaning each of the county's 38 townships gets revalued once every three years, on a rotating schedule the Cook County Assessor's Office publishes and updates directly. In 2026, it's the south and southwest suburban triad's turn, which includes Orland Township alongside Bloom, Bremen, Cicero, Lemont, Lyons, Palos, and Worth, among others. Orland Township covers Orland Park, Orland Hills, and part of Tinley Park, so this isn't a countywide event happening somewhere else. It's happening to the parcel your home sits on.
Notices are going out on a rolling basis, four or five townships at a time, from spring through fall. As of late July, six townships in the triad had already opened for appeals, with more added to the calendar every few weeks. Once your township opens, the window to file directly with the Assessor's Office runs roughly 30 to 40 days from the mail date, and that clock does not pause for anyone. Miss it, and your only remaining option is the Board of Review, which opens later in the year and gives you a second chance, not an extension.
The Mechanism Nobody Explains On the Notice
Here's the part that actually changes how you should read your envelope. Cook County's own explanation of how reassessment works is blunt about this: an increase in your individual assessment does not produce the same increase in your tax bill, because the total levy each taxing district collects (your schools, your park district, your library, the village itself) is fixed by budget, not by property value. Your bill is your share of that fixed total, based on how your assessed value compares to everyone else's in the township.
Orland Township's last reassessment, in 2023, is the clearest evidence of this. That cycle, the township's total assessed value grew by 38 percent. Any homeowner whose individual increase landed below that 38 percent mark actually saw their relative share shrink, even while holding a notice showing a double-digit jump. Their tax bill held flat or dropped. The homeowners who got hit were the ones whose increase outpaced the township average, whether because their block sold hot, their home had permitted improvements on file, or the mass appraisal model simply moved their neighborhood code more aggressively than others nearby.
That's the number that actually predicts your bill: not your percentage increase in isolation, but your percentage increase compared to Orland Township's overall movement this cycle. You won't find that comparison on the notice itself. You have to go looking for it, or ask someone who's already looking.
What the Numbers Actually Said Last Time
The other thing the notice doesn't tell you is your odds if you decide to push back. Orland Township's 2023 results give a real baseline for what to expect this cycle.
| Appeal Stage | Orland Township Outcome (2023 cycle) |
|---|---|
| Cook County Assessor's Office, first round (residential appeals) | About 1 in 5 appeals won a reduction (20.6%); condo owners did notably better, closer to 37% |
| Cook County Board of Review, second round (all Orland Township appeals) | Cumulative win rate across every appeal filed that cycle climbed to 51.3%, up from 16.1% at the Assessor stage alone |
The gap between those two rows is the case for filing twice. A homeowner who stops after a denied first-round appeal is leaving a meaningful share of the total upside on the table, since the Board of Review has historically doubled or tripled the share of appeals that end in a reduction once every property class is counted. Condominium owners in particular have outperformed single-family homeowners at the first stage, likely because unit comparables within the same building or association are easier to line up than scattered single-family comps across a subdivision.
What This Means If You're Selling This Fall
If your reassessment notice arrives while your home is on the market or under contract, you have two live decisions to make, not one.
- Compare your percentage change to the township-wide trend before deciding whether to appeal, not to last year's tax bill in isolation.
- If you're appealing, file inside the window. The Assessor's Office does not accept late filings under any circumstance, and a missed deadline means waiting until 2027 to try again at that level.
- If an appeal is still pending at closing, flag it for your attorney and title company so proration language and any future refund or adjustment gets addressed in the contract, rather than surfacing as a surprise after closing.
- Expect a buyer's lender to notice a sharp assessed value jump during underwriting and ask about it. Having your own explanation ready, tied to the township's overall movement rather than just your own number, keeps that conversation short.
None of this changes what your home is worth on the open market. Assessed value and market value are calculated differently and answer different questions. But a seller who can explain a reassessment jump in one sentence looks more credible to a buyer's agent and lender than one who reacts to it for the first time during due diligence.
What a Percentage Point Actually Costs
Orland Park's median sale price sat at $385,000 over the three months ending in May 2026, according to Redfin, up 5.8 percent from the same period a year earlier. Effective property tax rate estimates for Orland Park parcels run from about 2.08 percent to 2.27 percent depending on the data source and specific zip code, both meaningfully above Cook County's broader average of roughly 1.91 percent. Applied to that median sale price, the math lands somewhere between $8,000 and $8,700 a year before any homeowner exemption is applied.
Run the reassessment math on that number and the stakes get concrete fast. If your assessed value rises 10 percent and the township's total assessed value also rises roughly 10 percent, you moved with the pack, and your bill shifts only with whatever the taxing bodies actually levy that year, which is a separate decision made later. If your number rose 20 percent while the township averaged 10, you didn't just get reassessed. You got a larger slice of a pie that didn't grow to match, and that difference shows up on next year's bill whether you appeal or not.
A Few Questions Worth Settling Now
If my notice went up more than the township average, does that guarantee a real tax increase? Not automatically. Exemptions, changes to your taxing districts' levies, and the outcome of any appeal you file all factor in before a final bill is calculated. But a jump above the township average is the strongest early signal that your relative share, and likely your bill, is moving up.
Can I still appeal if my Assessor-level window already closed? Yes, through the Cook County Board of Review, which opens later in the year for each reassessment district. You don't need to have filed at the Assessor level first to file there.
Does an active appeal affect a home already under contract? It doesn't stop or delay a closing on its own, but it's worth disclosing to your attorney and the buyer's side so any refund, credit, or adjustment tied to the appeal's outcome gets handled cleanly in the paperwork rather than after the fact.
For the broader mechanics of how Cook County builds your bill, including exemptions worth checking before you file, our Orland Park property tax guide walks through the full county process. For where prices themselves have been moving this year, our 2026 Orland Park market update tracks that separately.
Reassessment years reward homeowners who read past the headline number, whether you're staying put, selling this fall, or just trying to plan around a bill that's about to change for reasons that have little to do with your home itself. If you want a clear read on what your specific property is actually worth in today's market before you decide what to do with your notice, Aaron Gaines offers a free home valuation to give you that number first.
