WASHINGTON — President Biden will seek new taxes on the rich, including a near doubling of the capital gains tax for people earning more than $1 million a year, to pay for the next phase in his $4 trillion plan to reshape the American economy.Mr. Biden will also propose raising the top marginal income tax rate to 39.6 percent from 37 percent, the level it was cut to by President Donald J. Trump’s tax overhaul in 2017. The proposals are in line with Mr. Biden’s campaign promises to raise taxes on the wealthy but not on households earning less than $400,000.The president will …
