An arcane rule in the GOP tax bill could ruin the 20 percent corporate rate

Senate Majority Leader Mitch McConnell, a Republican from Kentucky, center, speaks as Senator Orrin Hatch, a Republican from Utah and chairman of the Senate Finance Committee, right, and Senator Chuck Grassley, a Republican from Iowa, listen during a meeting with members of the committee on tax reform legislation at the U.S. Capitol in Washington, D.C., on Thursday, Nov. 9, 2017.

Andrew Harrer | Bloomberg | Getty Images

Senate Majority Leader Mitch McConnell, a Republican from Kentucky, center, speaks as Senator Orrin Hatch, a Republican from Utah and chairman of the Senate Finance Committee, right, and Senator Chuck Grassley, a Republican from Iowa, listen during a meeting with members of the committee on tax reform legislation at the U.S. Capitol in Washington, D.C., on Thursday, Nov. 9, 2017.

An arcane provision in the Senate tax bill could end up undermining the benefits of lower rates for businesses and households, according to tax experts.

The Senate’s bill maintains the alternative minimum tax, a measure that has been widely criticized as complex and onerous by…

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