The federal government is aiming to obtain $400 billion in new revenue over the next decade as part of the White House-backed $1.75 trillion social spending plan, according to a top Treasury official. Increased Internal Revenue Service enforcement to collect unpaid taxes makes up the largest source of revenue in the legislation to be considered by Congress this week, Deputy U.S. Treasury Secretary Wally Adeyemo told Reuters on Monday. Adeyemo said that the agency is planning to carry out more audits to deter tax avoidance among wealthier Americans. Adeyemo said that the IRS is planning to hire more agents, pursue more audit cases, and update its systems. The flurry of increased activity, he argued, will put more pressure on some individuals to hide their income. “When you are focusing on audits and people see that audits are happening—especially amongst people who are situated similar to them—you have better compliance,” Adeyemo told the …