Cook County computer upgrade causing property tax refund delays for residents, stopping revenue from reaching municipalities

COOK COUNTY, Ill. (WLS) — The I-Team has discovered significant county-wide delays affecting individuals awaiting property tax refund checks. These issues stem from complications arising during a technology upgrade.

The Cook County treasurer says the delays are also stopping revenue from going to municipalities.

ABC7 Chicago is now streaming 24/7. Click here to watch

The I-Team is finding that millions of dollars are sitting in limbo at the Cook County Treasurer’s Office.

The treasurer is blaming the technology company hired to upgrade the county’s computer systems.

Cook County computer systems from the treasurer, clerk and assessor are being combined into a single system.

The county has paid Tyler Technologies close to $29 million, but, about 10 years into the contract, there are delays.

The I-Team acquired a letter dated July 10 through a Freedom of Information Act request, authored by Treasurer Maria Pappas to Cook County President Toni Preckwinkle.

In this letter, Pappas mentions that setbacks caused by a private computer company are obstructing $216 million in property tax payments to 2,200 taxing bodies depending on this revenue. Additionally, the treasurer’s office is unable to issue $56 million in refund checks due to 25,000 property owners.

Preckwinkle responded in a letter, saying the treasurer’s office was not taking the proper action to prepare. But the treasurer denies that allegation, saying her office says it has been working around the clock.

And there are more delays when it comes to making assessment corrections.

The Cook County Assessor’s Office said that “…due to a countywide technology upgrade, the processing of Certificates of Error is temporarily on hold. This means that approved applications will not be issued refunds until the upgrade is complete… .”

“We empathize with homeowners; we understand it can be a frustrating process, and we are doing everything in our power to smooth this out,” said Angelina Romero, chief communications officer with the Cook County Assessor’s Office.

Tyler Technologies issued a statement to the I-Team, saying: “We continue to fully support Cook County as they move forward with their data review and full system implementation.”

Tyler added it’s been ensuring that data information being converted has been accurate, and that additional data resulted in changes.

In another letter, Cook County Treasurer Maria Pappas wrote to Tyler Technologies in May, saying: “Time and time again, Tyler has missed deadlines through the course of this project… Until resolved, we remain in limbo.”

Tyler Technologies responded to Pappas, saying: “While your letters tempt us to offer additional responses, we are laser-focused on the successful go-live we have worked hard to accomplish.”

County leaders say the computer issues will also delay the second installment of Cook County tax bills, which are usually due Aug. 1.

Once the upgrades are complete, the county says they will improve the processing of certificates of errors and refund checks.

Copyright © 2025 WLS-TV. All Rights Reserved.

You May Also Like
Washington State firefighters battle apartment blaze and explosion in Tacoma

Tacoma Apartment Fire and Explosion Draw Major Response From Washington Firefighters

Dramatic footage shows an explosion ripping through an electrical room at a…
Taylor Swift's wedding secrecy went so far some guests still didn't know location days before ceremony: source

Source: Taylor Swift Kept Wedding Location Secret From Some Guests Until Days Before Ceremony

NEW YORK — As recently as Sunday, even some people on the…
U.S. says it won't extend key trade deal with Canada and Mexico

U.S. Rules Out Extending Major Trade Deal With Canada and Mexico

The United States will not move to extend a major trade agreement…
$500,000 Bail for Alleged Would-Be Mass Shooter Transitioning to Female

Judge Sets $500,000 Bail for Transgender Suspect Accused of Planning Mass Shooting

A Henderson, Nevada, judge set bail at $500,000 on Wednesday for Allison…
Minnesota Gov. Tim Walz pardons illegal migrant convicted of sexually assaulting 10-year-old girl

Minnesota Gov. Tim Walz Pardons Undocumented Migrant Convicted of Sexually Assaulting 10-Year-Old Girl

Minnesota officials, including Democratic Gov. Tim Walz, pardoned an immigrant in the…
Chico library shooter’s dad reveals accused killer’s behavior before attack

Chico Library Shooting Suspect’s Father Reveals Troubling Behavior Before Deadly Attack

The father of alleged Chico library shooter Bradley Sayer has described his…
U.S. beats Bosnia-Herzegovina 2-0 to advance to round of 16 and keep its World Cup dreams alive

U.S. Defeats Bosnia-Herzegovina 2-0 to Reach Round of 16 and Keep World Cup Hopes Alive

Folarin Balogun scored his third goal of the World Cup before being…
Service member among 2 arrested after missing man probe leads cops to body dump site on Army base

Missing Man Investigation Leads Police to Body Dump Site on Army Base; Service Member Among 2 Arrested

A missing-person case in Washington state has become a homicide investigation after…
Mexico World Cup fans go wild in LA before cops swoop in

Mexico World Cup Fans Flood Los Angeles Streets as Police Move In

Celebrations by Mexico soccer supporters in Los Angeles spiraled into disorder Tuesday…
Mexican national sentenced in border child smuggling case involving THC-laced candy

Mexican National Sentenced in Child Smuggling Case at Border Involving THC-Laced Candy

Pirro announces major drug bust near DC school U.S. Attorney Jeanine Pirro…
How the American spirit really survived the Great Depression

How the American Spirit Endured Through the Great Depression

More than five years into the Great Depression, an Indiana commentator offered…
California city makes subtle change after $35M lawsuit over 70-year-old's streetside tumble

California City Updates Street Safety Measure After $35M Lawsuit Over 70-Year-Old’s Fall

San Diego officials are moving quickly to address a parking meter hazard…