washington congressional budget office say wednesday repeal obamacare individual mandate would increase number uninsured 13 million 2027 reduce federal budget deficit less initially forecast cbo nonpartisan budget-scoring agency say eliminate obamacare mandate americans purchase health insurance else pay fine would low deficit 338 billion next decade 416 billion estimate december agency find health insurance premiums would rise 10 percent years next decade individual market create affordable care act former democratic president barack obama signature domestic policy achievement note market areas country would remain stable president donald trump republicans favor include repeal mandate tax overhaul legislation lawmakers republican aid lobbyists say would difficult include repeal tax effort complicate intraparty differences intense business lobby u.s. house representatives unveil tax plan last week senate plan expect release thursday individual mandate central tenet obamacare health policy experts proponents say essential make law work compel young healthy people join health insurance market help low premiums offset cost sick patients americans must note tax return whether health coverage yet prove among controversial portion law republicans say obamacare expensive example government overreach argue federal government able require people buy health insurance want cbo say december report individual mandate increase federal deficit encourage people buy subsidize coverage either medicaid government health insurance program poor disable employer-provided plan obamacare individual health insurance market eliminate mandate would low deficit reduce federal spend subsidize health insurance coverage say cbo say abolish requirement would cause premiums rise healthy people would less likely purchase insurance find result increase would cause people forego insurance repeal individual mandate would increase uninsured premiums cbo