GOP rushed to pass tax overhaul. Now it may need to be altered.

The legislative blitz that rocketed the $1.5 trillion tax cut through Congress in less than two months created a host of errors and ambiguities in the law that businesses big and small are just now discovering and scrambling to address.

Companies and trade groups are pushing the Treasury Department and Congress to fix the law’s consequences, some intended and some not, including provisions that disadvantage certain farmers, hurt restaurateurs and retailers and could balloon the tax bills of large multinational corporations.

While Treasury can clear up uncertainty about some of the murky provisions, actual errors and unintended language can be solved only legislatively — at a time when Democrats seem disinclined to lend votes to shoring up a law they had no hand in passing and are actively trying to dismantle.