Mayor Zohran Mamdani’s push to hike New York’s corporate tax — if enacted — could cause an exodus of firms and residents across the Hudson to New Jersey, the head of the Big Apple’s top business group warned. “I don’t think the tax conversation is productive because we are going to be 100% higher than New Jersey if we take that proposal. New Jersey’s current corporate tax rate is 11%. If we do what the Mayor has recommended, will be at 22% – 100% over New Jersey,” Steve Fulop, the new CEO of