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What Is Stacking UM/UIM Coverage?

Stacking is a method of combining uninsured or underinsured motorist (UM/UIM) coverage limits from multiple policies or vehicles to increase the total compensation available after an accident. If you own two vehicles and each carries $100,000 in UM/UIM coverage, stacking could give you access to $200,000 in total benefits.

Illinois law permits stacking in certain circumstances, but insurance companies often include anti-stacking clauses in their policies. Understanding whether your coverage can be stacked is critical when the at-fault driver carries little or no insurance.

How Stacking Works in Illinois

Illinois courts have addressed stacking in numerous cases over the years. Under 215 ILCS 5/143a-2, insurers must offer UM/UIM coverage up to the policyholder’s liability limits. When a household owns multiple vehicles insured under separate policies or under a single policy with per-vehicle premiums, the question of stacking arises.

There are two types of stacking:

Intra-policy stacking means combining the UM/UIM limits for multiple vehicles listed on the same policy. If your single policy covers three cars each with $50,000 in UM/UIM coverage, intra-policy stacking could provide $150,000 in total coverage.

Inter-policy stacking means combining UM/UIM limits from separate insurance policies. For example, if you have one policy through State Farm and another through Allstate, both with UM/UIM coverage, inter-policy stacking would allow you to claim under both.

Anti-Stacking Clauses and Illinois Law

Most insurance policies contain language that attempts to limit coverage to a single vehicle’s UM/UIM amount regardless of how many vehicles are on the policy. Illinois courts have gone back and forth on the enforceability of these clauses. The key question is whether the policyholder paid separate premiums for UM/UIM coverage on each vehicle.

If you paid a separate UM/UIM premium for each vehicle on your policy, there is a strong argument that you purchased separate coverage for each vehicle and should be entitled to stack those amounts. An experienced Peoria personal injury attorney can review your specific policy language and premium structure.

Why Stacking Matters After an Accident

Stacking becomes particularly important when the at-fault driver is uninsured or carries only the Illinois minimum liability coverage of $25,000. If your injuries are serious—requiring surgery, extended rehabilitation, or causing permanent disability—minimum coverage will not come close to covering your losses.

By stacking UM/UIM coverage, you may be able to access significantly more compensation without filing a lawsuit against the at-fault driver. This is especially valuable when the at-fault driver has no assets to pursue beyond their insurance.

Steps to Determine If You Can Stack Coverage

First, gather all auto insurance policies in your household, including policies for vehicles you own and those of household members. Next, check whether each vehicle has its own UM/UIM premium. Review the policy language for any anti-stacking provisions. Then contact a personal injury attorney who can analyze your coverage and advise you on the best strategy for maximizing your recovery.

At Parker & Parker, we regularly handle car accident claims involving UM/UIM disputes. Our team can assess your coverage, negotiate with your insurer, and take the claim to arbitration if necessary.

Injured? Get a Free Case Review.

The personal injury attorneys at Parker & Parker have been fighting for accident victims in Peoria and across Central Illinois for over 25 years. Call (309) 674-0044 or contact us online for a free, no-obligation consultation.

Frequently Asked Questions

What does stacking UM/UIM coverage mean?

Stacking means combining the UM/UIM limits from multiple vehicles or policies to increase the total amount of compensation available after an accident with an uninsured or underinsured driver.

Is stacking UM/UIM coverage allowed in Illinois?

Illinois courts have allowed stacking in certain circumstances, particularly when the policyholder paid separate UM/UIM premiums for each vehicle. However, many policies contain anti-stacking clauses that insurers will try to enforce.

How do I know if my coverage can be stacked?

Check whether you paid separate UM/UIM premiums for each vehicle on your policy and review the policy language for anti-stacking provisions. An attorney experienced with Illinois UM/UIM law can evaluate your specific situation.

Dealing with injuries after a car crash can feel overwhelming. Our our Peoria personal injury team can guide you through every step of the legal process.

Stacking UM/UIM Coverage in Illinois: How to Maximize Your Protection