The Wynnes paid $123,363 in Maryland state income tax and claimed an $84,550 Maryland credit for taxes paid in other states on income from Maxim. Maryland taxes personal income at up to 5.75 percent. It also collects and distributes a piggyback income tax of up to 3.2 percent for each of the 23 counties and Baltimore City. But Maryland until now has offered no credit for the piggyback tax — in this case, the 3.2 percent the Wynnes owed to Howard County.