It is not clear whether or not you are in the military since typically you do not telework in the military.
However, if you are in the military, there is a federal law that they should not tax your military income in MD. You only pay taxes to your state of residence which is MA.
If you are not military the income is MD sourced and you would have to pay MD taxes on it and files a non-resident return.
See the instructions below for the military state of residence:
Military state of residence
Since you are a resident of MA ALL your income is taxable by MA regardless of where you earned it. So you must file a MA tax return.
Your income from MD is also taxable by MD. So therefore you have to file a tax return in both states. You won't be double-taxed, because MA will give you a credit for the taxes you pay to MD
In the personal info section of TurboTax, enter MA as your State of Residence, and indicate that you had Other State Income from MA.
In order to get the proper credit you should complete the non-resident MD return before you do your home state MA return so that the credit flows properly.
See additional guidance in the link below:
How do I file a nonresident state return?
@Marka81
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