2025 Illinois Underpayment Warning - Calculation Bug?

[Vollpreuss]

I'm receiving a tax underpayment warning for my 2025 Illinois State Tax return.  The tax liability being presented does not include the 4 estimated quarterly tax payments made for the 2025 tax year.  I have a refund due when the estimated tax payments are considered.   Why am I being alerted to a potential underpayment?  Is this a calculation bug or?   For now, I'm going to skip the annualization method and take the let Illinois figure out any penalty (if any) to expedite my tax return.  

[MonikaK1]

Depending on all of the applicable facts, it's still possible to have an underpayment penalty even though you are receiving a refund.

Also, each state's rules may be different. For Illinois, if you:

• have a tax liability greater than $1,000 after subtracting your withholding, pass-through withholding payments, and credits, or
• were required to make estimated tax payments and failed to pay the required amount by the payment due dates, you may owe a late-payment penalty for underpayment of estimated tax. See Form IL-2210 for details.

Check to see whether all of the state estimated payments were entered. Navigate to the estimated tax payments section:

• TurboTax Online/Mobile: Go to estimated tax payments under Deductions & Credits.
• TurboTax Desktop: Go to the Federal Taxes, then Deductions & Credits. Select Estimates and Other Taxes Paid.
• Select Start or Revisit next to the type of estimated tax payment you'd like to enter under Estimated Tax Payments.