What Iowa’s New Property Tax Law Means for Tax Increment Financing (TIF)

The property tax bill signed into law this spring (SF 2472, signed May 18, 2026) is the biggest overhaul of Iowa's property tax system in decades. Buried inside it are significant changes to Tax Increment Financing (TIF) – the single most common tool Iowa cities use to support housing and business development projects. Most of the TIF provisions take effect January 1, 2027, which means there is a narrow window between now and the end of this year when projects can still be structured under the current rules.

Here's the short version of what changed.

• One set of rules for all TIF: Economic development, market-rate housing, slum and blight – these categories used to carry different requirements. Going forward after January 1, 2027, they're largely subject to the same framework.
• A hard clock: New TIF ordinances are capped at 23 years of revenue collection. Previously, some categories ran shorter and some districts ran indefinitely.
• Less revenue per project: A portion of the school levy – the "school foundation levy" – is carved out of the levies eligible for TIF. In practical terms, the same project generates less increment than it would today.
• Housing TIF got easier, not harder: The old law required cities using TIF for market-rate housing to set aside a share of the revenue, roughly 37% in Dubuque County, for low and moderate income (LMI) housing elsewhere in the city. That requirement is gone after January 1, 2027, and the shorter durations that applied to market-rate housing deals are gone with it. Workforce housing is now explicitly recognized as economic development. This is arguably the most consequential change for our region's housing pipeline.
• Perpetual districts get a runway, then a haircut: Districts with no end date stay perpetual, but they operate under today's rules for 20 fiscal years measured from when debt was first certified. After that, they're limited to 60% of available increment and lose the school foundation levy.

What This Means Practically

Three things worth knowing if you're contemplating a project: Cities have until the end of this year to evaluate projects under the current rules versus the new ones. If you have a project in the pipeline, the conversation with your city should be happening now, not next spring.

Cities aren't required to go as far as the new law allows. The legislation expands what's permissible for housing TIF, but it doesn't dictate local priorities. Expect communities across the region to land in different places.

The administrative rules haven't been written yet. That process can take up to a year. Until it's done, a fair amount of how this actually applies to specific cities and specific projects remains genuinely uncertain, including some of the interpretations above.

Greater Dubuque Development is continuing to monitor how these changes affect housing and business development projects across the region, and we're working with cities, developers, and partners to understand the practical implications as they come into focus.

If you have a project, or a question about how these changes might affect one, please contact Nic Hockenberry, Director of Regional Development, at nicolash@greaterdubuque.org or 563-557-9049.