WASHINGTON—New tax increases proposed by President Joe Biden would kill one million jobs and harm the economy, a new study released by the nation’s largest manufacturing association states. For manufacturers, the tax reform of 2017 was like “rocket fuel” and if the new administration rolls back those reforms, “manufacturing workers will lose out on jobs, growth, and raises,” according to Jay Timmons, president and CEO of the National Association of Manufacturers (NAM). “After decades of advocating for a tax system that provided competitive rates and modern international tax provisions, manufacturers in America kept our promises following the enactment of the 2017 tax reforms: we raised wages and benefits, we hired more American workers, and we invested in our communities,” Timmons said in a press release. “If we undo those reforms, all of that will be put at significant risk.” As a result of the tax cuts, U.S. manufacturers added 263,000 …