President Donald Trump has promised the largest tax cut inhistory, but for scores of the biggest U.S. corporations, it mightbe just a tax nick.

Constrained by congressional rules, political concerns andsimple arithmetic, Republican leaders in Washington have yet toannounce any consensus on how to finance the deep corporate tax cutthey want, beyond vague plans to close off business-relatedloopholes.

But making comparatively narrow changes to the tax code won'tput much of a dent in the 35% corporate rate, taking it only as lowas 28% or so, according to three tax experts who've run thenumbers. That's almost double the 15% rate Trump has proposed andwell above the 20% that House Speaker Paul Ryan has suggested.