Thank you, I have analyzed the diagnostic file.
The Adjusted Gross Income from Line 16 of your MD Form 502 is the amount that Maryland uses for Line 1 of Form 502UP to compute underpayment interest. See here for Maryland Form 502UP.
The entry screen that you referenced does also show the amount of your total Maryland taxable income. Then, underneath the entry fields for the first three quarters, it shows the total for all four quarters as the Adjusted Gross Income. The Adjusted Gross Income (which you identified as Amount B) is the correct figure to use for the total.
The difference between your AGI and your Taxable income is the amount of your state exemptions and standard/itemized deductions.
If you are going to enter the amounts of income that you received in each of the first three quarters in order to annualize your income for purposes of calculating whether any underpayment interest is due, it makes sense to use the AGI rather than the Taxable Income as the total for all four quarters.
The Data Source for Form 502UP, Line 11, in TurboTax is shown as follows:
Column 1:
Calculated as line 1 multiplied by .250; or enterable if annualized box is checked.
Column 2:
Calculated as line 1 multiplied by .500; or enterable if annualized box is checked.
Column 3:
Calculated as line 1 multiplied by .750; or enterable if annualized box is checked.
Column 4:
Calculated as line 1 multiplied by 1.
I have reported the issue with the confusing taxable income reference showing on the screen where you input the first three quarters' income to add up to the Adjusted Gross Income.
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