The United States may soon wind up with a distinction that makes business leaders cringe — the highest corporate tax rate in the world.

Topping out at 35 percent, America’s official corporate income tax rate trails that of only Japan, at 39.5 percent, which has said it plans to lower its rate. It is nearly triple Ireland’s and 10 percentage points higher than in Denmark, Austria or China. To help companies here stay competitive, many executives say, Congress should lower it.

But by taking advantage of myriad breaks and loopholes that other countries generally do not offer, United States corporations pay only slightly more on average than their counterparts in other industrial countries. And some American corporations use aggressive strategies to pay less — often far less — than their competitors abroad and at home. A Government Accountability Office study released in 2008 found that 55 percent of United States companies paid no federal income taxes during at least one year in a seven-year period it studied.

The paradox of the United States tax code — high rates with a bounty of subsidies, shelters and special breaks — has made American multinationals “world leaders in tax avoidance,” according to Edward D. Kleinbard, a professor at the University of Southern California who was head of the Congressional joint committee on taxes. This has profound implications for businesses, the economy and the federal budget.