Cook County Property Tax Bills Face Delays Again

Ongoing technology issues and a record number of appeals continue to disrupt the county's tax billing cycle.

Apr. 16, 2026 at 8:27pm

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A geometric abstract illustration using bold shapes and primary colors to represent the disruption caused by delayed property tax bills in Cook County, without any text or identifiable elements.Delayed property tax bills disrupt funding for essential local services in Cook County.Chicago Today

Cook County property tax bills will be delayed again this year, with officials predicting they won't be mailed until at least August, well past the typical February and July deadlines. The delays are due to lingering technology problems with the county's property tax software upgrade, as well as a record number of appeals that have overwhelmed the Board of Review. Commissioners are concerned about how to communicate the timing of bills and refunds to homeowners, as well as provide revenue projections to local taxing bodies like libraries and schools.

Why it matters

The repeated delays in Cook County's property tax billing cycle have significant ripple effects across the region. Homeowners face uncertainty about when their bills will arrive and how much they'll owe, while local governments and public services rely on the timely receipt of tax revenue to fund their operations. The technology issues plaguing the county's property tax system have proven difficult to resolve, underscoring the challenges of modernizing legacy government infrastructure.

The details

The county's property tax bills will likely not be mailed until at least August, well past the typical February and July deadlines. This is due to a combination of factors, including lingering problems with the county's property tax software upgrade and a record 290,000 appeals filed with the Board of Review. The Board of Review is not expected to finish hearing appeals until the first week of June, after which the final numbers must be processed through several other county offices before the bills can be mailed. Additionally, the county is still dealing with 3,500 undelivered bills from November and tens of thousands of unpaid refunds, further complicating the process.

  • The Board of Review is expected to finish hearing appeals by the first week of June 2026.
  • Typically, first installment bills are mailed in February and due in March, while second installment bills are mailed in July and due in August.
  • Last year, second installment bills weren't mailed until November, and first installment bills this year were due in April.

The players

David Byrnes

Chief of staff to Treasurer Maria Pappas, whose office mails the property tax bills.

Sean Morrison

Vice Chair of the Cook County Board.

Toni Preckwinkle

President of the Cook County Board.

William O'Shields

Chief Deputy Commissioner of the Cook County Board of Review.

Tom Lynch

Head of the Cook County Bureau of Technology.

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What they’re saying

“On time meaning August 1? Virtually — not, not going to happen.”

— David Byrnes, Chief of staff to Treasurer Maria Pappas

“This is just like the R-rated version of the movie 'Groundhog Day'.”

— Sean Morrison, Vice Chair, Cook County Board

“There's no way to predict that at this moment in time, and it would be inappropriate for us to speculate.”

— Toni Preckwinkle, President, Cook County Board

“Each one of these defects is kind of its own story and there is no global fix for them.”

— David Byrnes, Chief of staff to Treasurer Maria Pappas

“We're finding many, many more defects which come from edge cases.”

— Tom Lynch, Head, Cook County Bureau of Technology

What’s next

The Board of Review is expected to finish hearing appeals by the first week of June 2026, after which the final numbers must be processed through several county offices before the tax bills can be mailed.

The takeaway

The ongoing delays in Cook County's property tax billing cycle highlight the significant challenges the county faces in modernizing its legacy technology systems. The ripple effects of these delays impact homeowners, local governments, and public services that rely on the timely receipt of tax revenue, underscoring the need for a more reliable and efficient property tax system.