This is not a TurboTax issue. You misunderstood the extension information because the extended deadlines did not apply to the estimated taxes paid. So, the underpayment penalty calculated by TurboTax in your return is correct.
Per the MD Tax Alert 02-29-2022A:
The extension does not impact the due dates of tax year 2022 quarterly estimated payments. Those due dates are April 15, 2022, June 15, 2022, September 15, 2022, and January 15, 2023 for calendar year filers. For individuals who file on a fiscal year basis, quarterly estimated payments are due by the 15th day of the 4th, 6th, 9th, and 13th months following the beginning of the fiscal year.
See MD Tax Alert for full details.
@mrk06
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