Maryland residents face a bevy of potential tax increases in July, some of which would disproportionately hurt residents in Montgomery County.

Proposing to raise $311 million in new revenue — in an effort to fill a $1 billion budget gap — Gov. Martin O’Malley has proposed new taxes on tobacco and Internet sales, an increase in the state’s “flush” tax, and reductions on income tax deductions that he says would amount to about $191 more a year for a family of four earning at least $150,000.