In the Maryland interview, you should see "Interest on Underpayment of Estimated Tax". Enter last year's tax (tis may produce one exception to the penalty).
Go through the screens. When you are asked if you want to review the calculation to see if you can reduce the penalty, click on YES.
The next screen is titled "Your Interest". Choose the bottom line, "Use annualization method".
The next screen "Annualization Method" allows you to enter your Maryland income for each quarter.
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