DALLAS — A lawsuit filed before the Texas Supreme Court seeks to strike down the state’s tax on business, claiming it violates the constitution’s prohibition on levying a personal income tax without voter approval.

The lawsuit, filed on behalf of plaintiffs Allcat Claims Services and one of its partners, John Weakly, challenges levies of the Texas Margin Tax, as it is known officially, for 2008 and 2009. The suit seeks to stop enforcement of the tax passed by the Legislature under House Bill 3 in 2006. Allcat is an insurance claims adjustment company in the San Antonio area.

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