The legislation will cut Missouri's top individual income tax rate for the first time in almost a century and make Missouri just the third state to enact a special deduction for business income reported on personal tax returns. The cuts will occur only if revenues keep growing.
Republicans have large majorities in the House and Senate but still needed Democratic help to achieve the two-thirds majority required for an overide.
Nixon had denounced the cut as a reckless financial experiment that could jeopardize funding for public education and state services.
Republicans made the measure a priority after failing last year to override Nixon's veto of a more expansive tax cut.
By David A. Lieb