obama is proposing to cut the corporate tax rate from 35 percent to 28 percent and wants an even lower effective rate for manufacturers, a senior administration official says.

The 35 percent nominal corporate tax rate is the highest in the world after Japan. But deductions, credits and exemptions allow many corporations to pay taxes at a much lower rate.

Under the framework proposed by the administration, the rate cuts, closed loopholes and the minimum tax on overseas earning would result in no increase to the deficit.

That means that many businesses that slip through loopholes or enjoy subsidies and pay an effective tax rate that is substantially less than the 35 percent corporate tax could end up paying more under Obama’s plan. Others, however, would pay less while some would simply benefit from a more simplified system.

Many members of both parties have said they favor overhauling the nation’s individual and corporate tax systems, which they complain have rates that are too high and are riddled with too many deductions.

Former Massachusetts Gov. Mitt Romney has called for a 25 percent rate, former House Speaker Newt Gingrich, R-Ga., would cut the corporate tax rate to 12.5 percent, and former Sen. Rick Santorum, R-Pa., would exempt domestic manufacturers from the corporate tax and halve the top rate for other businesses.

While Obama has been promoting various aspects of his economic agenda in personal appearances and speeches, the decision to leave the corporate tax plan to the Treasury Department to unveil signaled its lower priority.