Delaware Business Now Reading Time: 2 minutes Newark State Rep. John Kowalko has again introduced an income tax increase for those making more than $125,000 a year. The Newark Democrat has introduced House Bill 64, with a broader base of support than in past years. “This bill is intended to ensure a more fair and equitable progressive tax structure that is sustainable and not overly burdensome to any category of earners,” said Kowalko, D-Newark South. “It has been carefully calculated to apply a minimal amount of tax increases while ensuring a sustainable revenue source in future economic downturns.” Delaware has a 6.6 percent top income tax rate that affects a large percentage of taxpayers, since it kicks in when the adjusted annual income is only $60,000. Kowalko’s plan does not use added revenue from the top rates to lower tax bills for those making $60,000 or less.