According to a speech given by Curtis Dubay who is a staff economist at the Tax Foundation (in Maryland), Maryland's tax burden as compared to the rest of the region, is worsening.
"Maryland's Tax Burden
Marylanders currently pay 10.8 percent of their income in state and local taxes. This is right near the national average of 11.0 percent and ranks Maryland 23rd overall nationally.
Maryland would have jumped over West Virginia and competed with New Jersey for the highest-taxed state in the region. In fact, Maryland would only be a few hundredths of a percentage point behind New Jersey, meaning it would be knocking on the door of the top ten."