A buyer's agent pulls up a listing in Orland Park, scrolls to the taxes field, and does the math: mortgage plus insurance plus that number, divided by twelve, equals the monthly nut. It feels solid. It's printed on the sheet. It came from an actual tax bill.
It is also, right now, the wrong number to build a budget around.
Every home in Orland Township is being reassessed this year. That tax figure on the listing sheet reflects the assessment set back in 2023, frozen in place for three years while home values in the area kept climbing. The new number the Cook County Assessor's Office is calculating this year, off this year's market, hasn't shown up on any bill yet. It won't until the second installment goes out in 2027. Anyone doing carrying-cost math off today's tax line is budgeting against a number with an expiration date.
The Three-Year Clock Cook County Runs on Every Home
Cook County doesn't reassess all 1.9 million parcels at once. It splits the county into three groups, called triads, and reassesses one group each year on a rotating schedule. Whichever triad your township falls into determines when your assessed value gets recalculated and when it stays put.
| Triad | Last reassessed | Next reassessment |
|---|---|---|
| City of Chicago | 2025 | 2028 |
| North and Northwest suburbs | 2024 | 2027 |
| South and Southwest suburbs (includes Orland Township) | 2026 | 2029 |
This is not a quirk of one township. It is how the whole county operates, and the Cook County Assessor's Office confirms it directly: south and west suburban properties are undergoing reassessment this year, while City of Chicago and north suburban properties sit out unless something specific changes on the parcel, like new construction or a permit.
The mechanism matters more than the calendar trivia. Whatever value the Assessor lands on this year for a home in Orland Township becomes the base for that home's tax bill through 2029. Get it wrong in either direction and you're living with it for three years.
Why the Timing Bites Harder in Orland Park This Year
The last time Orland Township's assessed values were set was 2023. Since then, the market underneath those homes has moved. Orland Park's median list price climbed to $429,900 as of July 2026, an increase of roughly 8.8 percent since February of this year alone. That's the kind of appreciation the Assessor's office is required to account for when it recalculates fair market value this cycle, because assessments are built off recent sales data in the surrounding area.
Here's the part that catches people off guard. An increase in assessed value doesn't hit a tax bill immediately. It shows up on the second installment bill the year after reassessment. So a home that gets reassessed in 2026 based on the run-up in prices won't reflect that change until the bill that lands in 2027. Anyone closing on a home in Orland Park this year, or listing one, is operating in a gap between what the market has already done and what the tax bill has not yet caught up to.
An increased assessment results in a tax increase for the reassessment year and the two years that follow within that triennial cycle, and the change lands on the second installment bill issued the year after reassessment.
That's the whole mechanism in one sentence. The number on the sheet today is a snapshot of 2023. The number that actually shows up in your mailbox next year is being written right now.
What This Means If You're Buying in Orland Park
If you're comparing listings on price and taxes side by side, treat the tax figure as historical, not predictive. A few practical moves:
Ask the listing agent or your own agent whether the property's Orland Township reassessment notice has already gone out. The Assessor mails these on a rolling basis by township through the fall, and once a township opens, owners get roughly a 30-day window to see and challenge the proposed value. If the notice hasn't gone out yet, the number you're seeing on the current tax bill is guaranteed to change before your first full year of ownership is over.
Don't assume the change will be small. Given how much list prices have moved since 2023, and given that assessments in a reassessment year are pegged to current sales activity, a meaningful jump in assessed value is the more likely outcome for homes that have genuinely appreciated, not the exception.
Factor the lag into your first-year budget rather than your listing-sheet budget. If you close in late 2026, your 2026 tax bill was likely set under the old assessment. Your 2027 second installment is where the new number lands. Plan the monthly number you'll actually be paying eighteen months from now, not the one printed today.
What This Means If You're Selling
If you own in Orland Township and haven't looked at your assessment yet this year, the appeal window is not just a defensive move. It's part of pricing your home correctly.
Orland Township's own Assessor's Office will pull comparable properties assessed lower than yours and help build the case for a reduction, at no cost, during the township's open window. For condo owners, the office recommends filing as a group through the homeowners' association rather than individually, since it doesn't have access to unit-by-unit comps the way it does for single-family and townhome owners.
The stakes are not abstract. In the 2023 reassessment cycle, Orland Township residential appeals won a reduction 20.6 percent of the time at the first level, with condo owners winning at a notably higher 36.7 percent rate. Combined across both the Assessor's office and the Board of Review, the cumulative success rate reached roughly 51 percent. Half the people who appealed got a lower number. Most homeowners never file at all.
There's a pricing angle here too. A home carrying an inflated tax line looks more expensive to own every month than one that's been correctly assessed, and buyers do that math whether or not they say so out loud. Right now, 26 percent of Orland Park listings are cutting price before they sell, with an average reduction near 5.9 percent after sitting roughly 98 days on market. A seller who lets an outdated or inflated assessment ride into a listing is adding friction to a process that already has real risk of stalling. Reviewing your assessment before you list is the same instinct as fixing a deferred maintenance item before showings start. It's one less reason for a buyer to hesitate.
A Few Quick Questions
How do I find out if my Orland Township notice has been mailed yet? Check the Cook County Assessor's assessment calendar directly. Townships open on a rolling basis through the fall, and the calendar updates as each one is mailed and certified.
Does appealing hurt my chances of getting a strong offer? No. Appealing your assessment doesn't touch your list price or your home's market value. It only affects the tax bill, which is a separate number buyers weigh when deciding what they can afford to carry.
I'm buying now and won't be here when the new bill hits in 2027. Does any of this matter to me? It matters for resale. Whatever assessed value gets set this year follows the property, not the owner, through 2029. If you buy this year and sell before the cycle resets, your buyer inherits the same number you're inheriting now.
What if my assessment actually goes down? It happens. If your new assessed value comes in lower, you generally don't need to do anything. The lower number carries forward automatically. It's worth double checking that any exemptions you're entitled to, like a homeowner exemption, are still applied correctly on the new notice.
The tax line on a listing sheet has always been treated as a fact. This year, in Orland Township, it's closer to a placeholder. Understanding which one you're looking at is the difference between a budget that holds up and one that gets a surprise in 2027.
If you're weighing a purchase in Orland Park, comparing it to a nearby suburb, or getting ready to list and want a clear-eyed read on where your assessment and your pricing actually stand, Tim Good Group can walk through the numbers with you. What's My Home Worth?
