Uninsured motorist coverage rules in Iowa

Iowa runs on an at-fault system, so after a crash you normally collect from the driver who caused it. That plan falls apart the moment the other driver has no insurance, takes off, or carries a policy far too small to cover a hospital stay. Uninsured and underinsured motorist coverage, usually written UM and UIM, is your own policy stepping into that driver's shoes. Iowa's version comes with rules most drivers never read until they need them, and one deadline that has ended otherwise solid claims. The exposure is real: police across Iowa logged 52,680 crashes statewide in 2025 ¹, with another 3,824 in June 2026 alone ², and a meaningful share of them involve drivers who cannot pay for the harm they cause.

It is already in your policy unless you signed it away

Iowa Code section 516A.1 says no auto liability policy can be delivered or issued in this state "unless coverage is provided" for people who are legally entitled to recover from an uninsured, hit-and-run, or underinsured vehicle. ³ UM/UIM starts out built into every policy sold here. You can turn it down, but Iowa makes that deliberately hard. The named insured has to reject it in writing with a signed rejection, and if the insurer uses its own form, the rejection has to sit on a separate sheet of paper that contains only the rejection and information directly related to it. ³ With no signed rejection in the file, the coverage applies, even when it never appears on your declarations page. There is a catch on the other side too: once you reject the coverage with a particular insurer, that carrier is not required to keep offering it every time the policy renews. ³ The safe move is to read your actual policy instead of assuming what you have.

The three ways it applies, and the hit-and-run trap

Section 516A.1 covers three different situations, and Iowa handles each one on its own terms. ³ The first is a truly uninsured driver, one who carried no liability insurance at all. Iowa quietly adds a second version of "uninsured" that many people miss: under section 516A.3, if the at-fault driver's insurer is insolvent at the time of the crash or becomes insolvent afterward, that driver is treated as uninsured and your UM coverage responds. ³ A company going under does not leave you stranded.

The hit-and-run rules are where Iowa catches people off guard. The statute only counts a vehicle as a hit-and-run vehicle when there was "physical contact" between it and you or the car you were occupying. ³ If a phantom driver drifts into your lane and forces you off the road but never touches your vehicle, that is not a hit-and-run under Iowa's UM statute, and insurers regularly deny those no-contact claims on exactly that ground. When it happens, the police report and any independent witnesses matter enormously, because they are the difference between a paid claim and a denied one. You can pull the official Iowa crash report to document who was involved.

The third situation is the underinsured driver, someone who did have insurance but not enough of it. When the at-fault driver's bodily-injury limit is lower than your UIM limit, your own UIM steps in to cover the gap.

How much you get, and why stacking will not work here

Iowa's required UM/UIM is bodily-injury coverage only. The minimum tracks the state's liability floor, $20,000 per person and $40,000 per accident for bodily injury or death, the figures set in Iowa Code section 321A.21 and listed on the Iowa Insurance Division's own auto page. ⁴⁵ There is no state-required UM coverage for damage to your car, so property damage caused by an uninsured driver is a separate matter; if your vehicle lost market value in the wreck, that is a diminished value claim.

Then comes the rule that costs people the most money: Iowa does not allow stacking. If you are covered under more than one policy, section 516A.2 limits you to "an amount equal to the highest single limit" available under any one of those policies, not the combined total. ⁶ The legislature wrote that anti-stacking language specifically to override a 1990 Iowa Supreme Court decision, Hernandez v. Farmers Insurance Company, that had permitted stacking, and the statute now declares that ruling abrogated. ⁶ Insurers are also allowed to write in offsets so you cannot collect twice for the same injury. ⁶

Your own insurer defends the claim like the other side would

A UM/UIM claim feels like a benefit you paid for, and it is, but in practice you have to prove the other driver's fault to your own carrier, and that carrier can raise every defense the at-fault driver could. Iowa's modified comparative fault rule applies in full. Under Iowa Code section 668.3, you recover nothing if a jury finds you more than 50 percent at fault, and any recovery is reduced by your own percentage of fault. ⁷ If your insurer does pay, section 516A.4 gives it subrogation rights, which means it can then pursue the at-fault driver to recover what it paid out to you. ³

The deadline that quietly ends claims

This is the part to circle in red. A standard injury claim against the driver who hit you has a two-year statute of limitations in Iowa under Code section 614.1(2). ⁸ A UIM claim is legally different, because it is a claim on your own insurance contract, so the starting point is Iowa's ten-year limit for suits on written contracts under section 614.1(5). ⁸ Here is the trap. In Robinson v. Allied Property and Casualty Insurance Company, the Iowa Supreme Court held that an insurer is free to shorten that window by contract, and it upheld a policy clause barring UIM lawsuits filed more than two years after the crash. ⁹ The driver in that case filed almost six years out and lost her claim entirely. ⁹ Plenty of Iowa auto policies carry that same two-year limitation. So even though the statute looks like it hands you a decade, your policy may quietly give you two years, and the policy controls. Read the UM/UIM section of your own policy, and if any deadline is close, get a lawyer's eyes on it first. You can find an Iowa attorney who handles these claims.

When the driver who hit you cannot pay, your own policy becomes the case. In Iowa that coverage is probably already there, whether or not you remember buying it. The physical-contact requirement for hit-and-runs and the shortened contractual deadline are where these claims die most often, and both are avoidable once you know they exist.

This article is general information about Iowa law, not legal advice.

Sources

1. thatcarhitme.com, Iowa Statewide Crash Report, 2025. https://thatcarhitme.com/crash-data/iowa/statewide/2025-annual-report

2. thatcarhitme.com, Iowa Statewide Crash Report, June 2026. https://thatcarhitme.com/crash-data/iowa/statewide/june-2026-report

3. Iowa Code chapter 516A, Uninsured, Underinsured, or Hit-and-Run Motorists (sections 516A.1, 516A.3, and 516A.4). https://www.legis.iowa.gov/docs/code/516A.pdf

4. Iowa Code section 321A.21, required motor vehicle liability coverage amounts. https://www.legis.iowa.gov/docs/code/321A.21.pdf

5. Iowa Insurance Division, Auto Insurance. https://iid.iowa.gov/consumers/insurance/auto

6. Iowa Code section 516A.2, Construction, minimum coverage, stacking. https://www.legis.iowa.gov/docs/code/516A.2.pdf

7. Iowa Code section 668.3, comparative fault. https://www.legis.iowa.gov/docs/code/668.3.pdf

8. Iowa Code section 614.1, periods of limitation. https://www.legis.iowa.gov/docs/code/614.1.pdf

9. Robinson v. Allied Property and Casualty Insurance Company, No. 10-1721, 816 N.W.2d 398 (Iowa June 29, 2012), Iowa Judicial Branch. https://www.iowacourts.gov/moduledocuments/embed/2419/101721_FBE337FE801D1.pdf