At a North Liberty City Council budget hearing on March 24, a resident asked a direct question: if the city's tax levy is going up, does that mean a 5 percent tax increase? Mayor Chris Hoffman and City Administrator Ryan Heiar spent several minutes walking through why the answer isn't that simple. The levy rate a city sets and the actual tax bill a homeowner pays are two different numbers, moved by two different processes, and in North Liberty's case this year they were headed in opposite directions.
That distinction matters beyond one meeting. If you're comparing North Liberty, Iowa City, and Coralville as places to buy, you've probably already looked at each city's property tax rate as a shorthand for cost of ownership. This year that shorthand breaks. North Liberty's rate is rising. Iowa City's is falling. Coralville's has been trimmed two years running. None of that ranks the three cities by affordability, because a single state law is pushing all three in different directions depending on how fast each one is growing, not on how expensive homes are.
What the Numbers Actually Show
For the fiscal year that began July 1, 2026, North Liberty's property tax levy rose to $11.84 per $1,000 of taxable valuation, up 15 cents from $11.69 the year before. That's the second consecutive annual increase for a city that had been holding levies lower just a few years earlier.
Iowa City moved the other way. Its levy has sat unchanged for three straight fiscal years, and the city's proposed FY2027 budget calls for an actual decrease, helped in part by new revenue from a 1 percent local-option sales tax that Iowa City voters approved by an 84 percent margin in November 2025.
Coralville has been cutting on a smaller scale. Its FY2026 levy dropped slightly, from $14.55016 to $14.52739 per $1,000, continuing a pattern city officials attributed to taxable value growth that stayed under the threshold that triggers the state's revenue caps.
Line the three up and the pattern looks backwards. North Liberty, the newest housing stock in the corridor and the fastest-growing of the three cities, has the rate that's climbing. Iowa City and Coralville, both larger and slower-growing, are the ones cutting.
Why a Growing City Hits the Cap Harder
The mechanism is a 2023 Iowa property tax law, signed by Gov. Kim Reynolds, that limits how much of a city's rising valuation can turn into new levy revenue. The faster a city's tax base grows, the smaller the share of that growth it's allowed to keep.
North Liberty's total taxable value grew 5.28 percent this year. Under the state formula, the city could only capture 3.22 percent of that as actual revenue growth. Heiar explained the gap to the council directly, saying the assumption that valuation growth and revenue growth move together is "just not the case, with the new tax law." City staff have been tracking the cumulative shortfall, and by the end of fiscal 2027 it will top $1.3 million in revenue the city would have collected under the old rules.
Coralville ran into a milder version of the same cap in its own FY2026 budget cycle. Its taxable value grew 3.67 percent, which put it in a lower growth bracket under the state formula, so the city adjusted revenue growth down to 2.67 percent and still had room to trim the rate. City finance staff noted that two-thirds of Iowa cities ended up with a decreased general fund levy that year because of the same limitation factor. North Liberty's faster growth simply put it in a tighter bracket.
Iowa City doesn't face the same math at all. Its tax base is larger and growing more slowly in percentage terms, so the cap barely constrains it, and new sales tax revenue gives it room to cut the levy on top of that.
Where North Liberty's Extra 15 Cents Is Going
The rate increase isn't abstract. North Liberty's FY2027 budget adds two full-time firefighters, two sewer and stormwater laborers, and a half-time event lead position for the Hy-Vee Center. Capital projects on the books include locker-room remodels at the aquatic center and continued work on the Cherry Street firehouse. City Administrator Heiar has also pointed to one revenue source that's working in the city's favor outside the levy cap: the Monies and Credit Tax collected from GreenState Credit Union, which is headquartered in North Liberty, has been growing and helps offset some of the pressure from the state's revenue limits.
Even with that help, Heiar was blunt about the long-term trend in an earlier budget session, calling the lost revenue capacity "real money" with consequences down the road.
Iowa City and Coralville Took a Different Path
Iowa City's flexibility comes from a different lever entirely. City Manager Geoff Fruin told the council the general fund budget still shows a deficit even with the tax reform's effects factored in, warning there's "going to be some long term constraints in the general fund." The city is covering that gap with reserves for now, but the local-option sales tax passed in November is doing real work: half its revenue is earmarked for property tax relief, with the rest split between affordable housing, infrastructure, and community partnerships.
Coralville's approach has leaned on non-property-tax revenue too. The city raised its utility franchise fee from 1 percent to 2 percent, a change expected to bring in an additional $325,000 to $350,000 a year, specifically framed as a way to reduce reliance on property tax collections. Combined with modest valuation growth that kept it under the tighter state caps, that gave Coralville room to cut its levy slightly two years running.
The Number That Moves Independently of Any City Council
None of this explains the confusion at that March hearing on its own. The other half of the answer is the state's residential rollback rate, a separate figure set by the Iowa Department of Revenue that determines what portion of a home's assessed value is actually subject to tax. For fiscal 2027, that rollback rate is dropping from 47.4316 percent to 44.5345 percent statewide.
That single number affects every homeowner in Iowa City, Coralville, and North Liberty at once, regardless of what any individual city council decides about its levy. Iowa City's own budget staff estimated that every one percentage point of rollback change is worth roughly $1.3 million in city tax revenue, which shows how much weight this one state-level figure carries relative to local decisions.
That's the piece Mayor Hoffman had to walk the resident through. North Liberty's levy going up 15 cents does not translate directly into a bigger tax bill, because the rollback drop is shrinking the taxable share of every home's value at the same time. City budget documents note that most North Liberty residents will likely pay less or about the same in city property taxes this year, even with the higher rate on paper.
What This Means If You're Comparing These Three Cities
A few things follow from this that are worth carrying into a home search rather than just filing away:
- A city's current levy rate tells you almost nothing about its trajectory. North Liberty's rate has room to keep climbing as long as its valuation growth keeps outpacing what the state cap lets it capture. Iowa City and Coralville have more headroom to hold steady because their growth rates put them in looser brackets.
- The rollback rate matters more than any single city's decision. It applies uniformly across Johnson County, so a falling rollback can offset a rising local levy, and a flat local levy still delivers real savings when the rollback drops under it.
- Diversified revenue changes the picture. Coralville's franchise fee increase and Iowa City's new sales tax are both explicit attempts to lean less on property tax as the primary funding source. A city with more of those levers has more room to keep its levy flat even as it grows.
- This dynamic is scheduled to keep evolving. The growth-tier caps under the 2023 law are being evaluated annually through fiscal 2028, and state lawmakers are still discussing further changes to the rollback and levy system, so this year's numbers aren't a one-time event.
A Couple of Direct Questions
If North Liberty's rate keeps rising, will it eventually cost more to own there than in Iowa City? The rate alone can't answer that. It depends on how the rollback moves in future years and on how much of each city's spending is funded through property tax versus other revenue like sales tax or franchise fees. All three cities are adjusting on that second front right now.
Does a lower levy rate in Iowa City or Coralville always mean a lower total bill? Not automatically. School district and county levies are set separately and layer on top of the city rate, and homestead credits and other exemptions can shift the final number for an individual property. The city levy is one piece of a bill made up of several taxing authorities.
If you're weighing North Liberty against Iowa City or Coralville and want to understand what a specific property's tax picture actually looks like, rather than just comparing headline rates, that's the kind of digging Teague Case and the team at Case Group Realty do as part of helping buyers compare these markets property by property.
