Gov. Gavin Newsom has proposed new taxes and fees to fund health care subsidies, clean drinking water and tax credits for low-income families. But state revenue outpacing even his most optimistic predictions could present a challenge for him as he attempts to raise taxes. Last month, corporate taxes came in at $3.4 billion, much higher than the Newsom administration’s estimated $2.6 billion. Income taxes also came in ahead of projections, making up for a shortfall earlier in the year, according to the Legislative Analyst’s Office.