You are correct that 1/18/2022 is the due date for estimated 2021 taxes for Illinois.
"Turbo Tax says the due date 01/17/22" - can you tell me where it says this? Online? CD/download? Windows? Mac? In the state interview? Or in the federal interview where you enter estimated taxes paid for a state?
Actually, if you could give us a screenshot with any personally identifiable information redacted, that would be great.
@dgsimm
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