Iowa voters appear to be leaning toward making it significantly harder for state lawmakers to raise income taxes in the future, with unofficial returns showing a lead for a constitutional amendment that would require a two-thirds supermajority vote in both the Iowa House and Senate to increase personal or corporate income taxes. The outcome was not yet finalized as ballots continued to be tallied.
According to the Iowa Capital Dispatch, unofficial results attributed to the Associated Press showed Amendment 1 leading with 55% voting yes and 45% voting no, with 84% of votes counted as of 12:05 a.m. Wednesday, November 4, 2026. The Des Moines Register reported a slightly different split, putting the measure at 56% in favor and 44% opposed as of 12:10 a.m. Wednesday. The Associated Press had not called the race at that point, with an estimated 84% of votes counted, the Des Moines Register noted.
Those numbers remain unofficial. KCCI reported that results would not be final until county and state officials formally certify them, a process that had not concluded as of the latest reporting.
What Amendment 1 Would Actually Change
Under current Iowa law, a simple majority in each legislative chamber is enough to pass an income or corporate tax increase, according to Iowa Public Radio. Amendment 1 would raise that bar substantially, requiring a two-thirds supermajority of lawmakers in both the House and Senate before any personal or corporate income tax hike could take effect — meaning Iowa lawmakers would likely need broad, bipartisan buy-in to raise those taxes going forward.
Getting the measure to the ballot took years. Under Iowa's constitutional process, a proposed amendment must be approved by two separate, consecutively elected General Assemblies in identical form before voters ever see it, and then it must be ratified by a majority of electors at a designated election, according to the Iowa Legislature's constitution. Lawmakers passed this particular resolution in both 2024 and 2026 before it reached this week's ballot. If ratified, it would become Iowa's 52nd constitutional amendment.
Supporters and Opponents Split Along Familiar Lines
Supporters of Amendment 1, who were largely Republicans, argued the measure would protect taxpayers by locking in GOP-backed tax policy and making it harder for future legislatures to reverse course. They also contended lawmakers could still raise income taxes when truly necessary, just with broader bipartisan support required as a last resort.
Opponents, including Democrats, pushed back hard. They argued the amendment would lock in what they called unsustainable tax cuts that mostly benefited Iowa's highest earners while contributing to a billion-dollar state budget deficit. Critics also warned that if lawmakers couldn't easily raise income taxes, they would likely turn instead to sales taxes and fees that, per the Des Moines Register, disproportionately affect working Iowans — along with potential spending cuts to public schools and services for vulnerable residents.
The Fiscal Backdrop Driving the Debate
Iowa currently has a flat individual income tax rate of 3.8%, the product of a 2025 law and several earlier rounds of Republican-backed tax cuts, as reported by Iowa Public Radio. The state's sales tax is another part of the tax debate.
Iowa's revenue actually fell 7.1% in fiscal year 2026 compared with the previous year, a drop of just under $635 million, according to the Iowa Capital Dispatch. State revenue estimators project 2.8% growth in fiscal year 2027, bringing in an estimated $8.54 billion, but that figure still falls more than $1 billion short of the $9.65 billion budget for the fiscal year ending June 30, 2028, the outlet reported.
Iowa is not alone in weighing this kind of constitutional guardrail. As of April 2025, 15 states had supermajority requirements for raising income taxes, according to Iowa Public Radio's citation of the National Conference of State Legislatures. Other states that have cut income taxes in recent years have seen steep revenue consequences: the Institute on Taxation and Economic Policy estimated Oklahoma's May 2025 income-tax cut would cost $397 million annually, while fully triggered future cuts there could eventually reduce state revenue by nearly $6 billion a year. The Center on Budget and Policy Priorities described Georgia's tax law as creating a $1.2 billion shortfall now, growing to more than $6 billion annually once fully phased in, and pegged Arkansas's most recent cuts at $192 million in lost revenue next year and roughly $145 million annually after that.
For now, Iowa's outcome remains unsettled. The vote tallies reported by the Iowa Capital Dispatch and the Des Moines Register differ slightly, and both outlets made clear the results were unofficial pending certification by county and state election officials.
