I've been using a mock return in TurboTax and have been working with several scenarios with varying amounts of Federal itemized deductions and the only time it switched to a standard deduction for Maryland was when it was more beneficial to do so.
While Federal deductions for state and local income taxes are allowed, they must be subtracted out of the Federal itemized deductions to arrive at the Maryland itemized deduction. If your only Federal itemized deductions were state and local income taxes, this could be why you are getting the Maryland standard deduction on your return.
It would be really helpful if you followed the instructions for sending the diagnostic file (as outlined in AmyC's post, earlier), so that we can take a much closer look at your particular situation to see if we can figure out why you might be getting a Maryland standard deduction when itemizing Federal.
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