Jon M. Huntsman Jr. again showed himself on Wednesday to be an ideological outlier in the Republican presidential field, calling for the tax code to be stripped of all loopholes and deductions.

Congressional Republicans have resisted closing loopholes in recent budget talks, portraying such moves as tax increases.

“Over the last few decades, our tax code has devolved into a maze of special-interest carve-outs, loopholes and temporary provisions that cost taxpayers more than $400 billion a year to comply with,” Mr. Huntsman said in a speech at a metal plant in Hudson, N.H. “Get rid of all tax expenditures, all loopholes, all deductions, all subsidies, all corporate welfare.”

Mr. Huntsman’s plan, which borrows from both Representative Paul D. Ryan’s proposal and the bipartisan Simpson-Bowles Commission recommendations to reduce the deficit, also calls for sharply lowering both corporate and individual tax rates, as well as ending taxes on capital gains and dividends, positions more in line with Republican orthodoxy.