In October, Carson District Judge James Wilson blocked the petition to impose a 2 percent margin tax on businesses making $1 million or more, saying the 200-word description of what it would do was deceptive.
In their ruling the Nevada Supreme Court wrote, "A description of effect need not articulate every detail and possible effect that an initiative may have. Instead, given that these descriptions are utilized only in the early, signature-gathering phase of the initiative process and that descriptions of effect are limited to 200 words, they need only provide a straightforward, succinct, and nonargumentative summary of what an initiative is designed to achieve and how it intends to reach those goals."
The initiative is backed by the state teachers union and other labor groups. It was challenged twice by a coalition called Committee to Protect Nevada Jobs.
The proposal would still have to be passed by the Legislature and approved by Gov. Brian Sandoval has vowed to veto any new tax.
If lawmakers reject it or fail to act, it would automatically go to voters in 2014.