BOISE, Idaho (AP) — Idaho lawmakers have sent a tax conformity bill back to the drawing board because it would have removed an unenforceable rule banning joint returns from same-sex couples.

Members of the Idaho House of Representatives voted 54-15 Thursday to send the bill back to committee. The legislation is brought annually to make the state's tax code conform with changes to federal tax code. This year's version sought to remove a requirement for same-sex couples to file separate state tax returns.

That requirement is now void because the U.S. Supreme Court rules last year that states can't enforce gay marriage bans. Lawmakers usually prefer to sync the state's tax code with the federal version to make it easier for residents and businesses to do their taxes or avoid having to keep separate accounting books to track the different rules.

Rep. Heather Scott of Blanchard was the only Republican to vote against sending the bill back to committee, even though she cast one of the few nay votes to send the measure to the House floor. A new version of the bill has been scheduled to be introduced on Friday.

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