There are some worthy elements to the $1.5 trillion tax-cut bill House Republicans have finally released after months of secretive drafting. It would lower the corporate tax rate to a level competitive with the rates in other developed nations. It would reign in tax breaks that favor the wealthy. It would modestly expand tax credits targeted at low-income filers. But it also has one glaring flaw: While it’s obvious how businesses would benefit from the cuts, it’s not at all clear how individual taxpayers would fare.