Leaders in the District of Columbia must be pretty happy whenever they look north. The Montgomery County suburbs once had several economic advantages for new residents and businesses to move there. Luckily, the state and county governments are hard at work eliminating them, one by one, making D.C. more competitive each day.

The county’s high-income earners, long squeezed by the county’s piggyback tax, will now pay D.C. income tax rates without the benefit of the District’s low property taxes, thanks to Maryland’s new “hundred-thousandaires tax.” As for businesses, the County Council moved to punish them on Tuesday.