What Is Indexed Universal Life Insurance? Caps, Floors and Fees

Indexed universal life (IUL) insurance is permanent life insurance that pays a death benefit and builds a cash value that earns interest based on a stock market index, such as the S&P 500. Your gains are limited by a cap and a participation rate, and your index losses are limited by a floor, often 0%. Monthly policy charges still come out of the cash value, so results depend heavily on costs and on rates the insurer can change.

IUL can make sense for some people who want lifelong coverage and are comfortable with a complex product. It is not a savings account, not a stock investment, and not a guaranteed path to retirement income. This guide explains how the pieces fit together so you can ask the right questions.

How does indexed universal life insurance work?

An IUL policy combines a death benefit with a cash value account, and the account earns interest linked to an index. It sits under the universal life umbrella, which means premiums and coverage are flexible.

FINRA describes universal life as coverage for the life of the insured with flexible premiums, where the cost of your insurance protection and other costs are deducted from the policy's account value. Indexed universal life follows a set stock index rather than letting you pick investments.

Here is the basic cycle:

1. You pay a premium. The insurer takes out premium charges.
2. The rest goes into the cash value account.
3. Each month, the insurer deducts the cost of insurance and other fees.
4. At the end of each index period, often one year, the insurer credits interest based on the index's change, subject to the cap, participation rate and floor.
5. When you die, your beneficiaries receive the death benefit.

Your money is not actually invested in the stock market. The index only determines how much interest is credited.

What are caps, participation rates and floors?

These three terms decide how much interest your policy earns. Caps and participation rates limit the upside; the floor limits the downside.

These numbers are round, illustrative examples, not quotes from any insurer.

Two points matter most. First, index returns used for crediting usually leave out dividends, so the credit is based on price changes only. Second, insurers can generally lower caps and participation rates over time, down to guaranteed minimums written in the policy. A policy sold with an attractive cap may credit less in later years.

What fees and charges come with an IUL policy?

IUL policies have several layers of cost, and they matter as much as the index. Common charges include:

• Premium load: a percentage taken from each premium before it reaches the cash value.
• Cost of insurance (COI): the monthly charge for the death benefit. It is based on your age, health and the amount at risk, and it usually rises as you get older.
• Administrative or policy fees: flat monthly or annual charges.
• Rider charges: costs for added features like long-term care or chronic illness riders.
• Surrender charges: fees if you cancel or withdraw heavily in the early years. The surrender period is set in your policy and can last many years, so check the schedule before you buy.
• Loan interest: charged if you borrow against the cash value.

Because the cost of insurance rises with age, a policy that looked well funded at 45 can come under strain at 75. If premiums are low and interest credits are weak, charges can drain the cash value and the policy can lapse.

Are IUL illustrations guaranteed?

No. An illustration is a projection of how the policy might perform under certain assumptions, and the favorable columns are not guaranteed.

The NAIC explains that illustrations are governed by the Life Insurance Illustrations Model Regulation (#582). A basic illustration must show both guaranteed and non-guaranteed elements. For universal life, the non-guaranteed elements include the current death benefit, the current fund accumulation and the cash values tied to them.

Because index-linked illustrations used to vary widely between companies, the NAIC adopted Actuarial Guideline 49 in 2015. For policies sold on or after December 14, 2020, it was replaced by Actuarial Guideline 49-A. According to the NAIC, AG 49-A was revised to tighten illustration limits in 2023 and to enhance consumer-protection disclosures in 2026.

AG 49-A limits the illustrated rate, but a limit is still an assumption. Real returns will vary year to year, and caps may drop. When you review an illustration:

• Look at the guaranteed column first. It shows what happens if the insurer charges the maximum and credits the minimum.
• Ask for a version at a lower assumed rate and see whether the policy still lasts to age 90 or 100.
• Check how much of any projected income relies on policy loans.
• Note the premium you must pay to keep the policy in force under each scenario.

What about using IUL for retirement income?

Some sales pitches present IUL as a retirement plan. Be cautious. Income is usually taken as policy loans or withdrawals, and it depends on the cash value growing as illustrated.

Loans accrue interest and reduce the death benefit. If loans plus charges exhaust the cash value, the policy can lapse. A lapse with an outstanding loan can trigger taxable income. Tax rules for life insurance are complex, so speak with a tax professional before relying on any policy for income. Our guide on whether life insurance is taxable covers the general IRS rules.

FINRA advises making sure the professional selling you a policy fully understands your finances and goals, and verifying that they are properly licensed. You can check an agent's license through your state insurance department.

How does IUL compare to term and whole life?

IUL sits between the simplicity of term and the guarantees of whole life. Here is a plain comparison:

For a deeper look at the first two, see our guide to term vs. whole life insurance. For head-to-head comparisons, read IUL vs. term life insurance and IUL vs. whole life insurance.

Who might consider IUL, and who might not?

IUL may fit someone who wants permanent coverage, can pay premiums well above the minimum for many years, and is comfortable reviewing the policy every year. It tends to fit poorly for people who need low, predictable premiums or who only want to cover a specific cost.

Questions to ask yourself:

• Do I need coverage for life, or only until my mortgage is paid or my kids are grown?
• Can I keep paying more than the minimum premium, even in tight years?
• Will I read an in-force illustration every year and adjust if needed?
• Do I understand what happens if caps fall?

If your main goal is covering a funeral or leaving a modest set amount, final expense insurance offers fixed premiums and a fixed benefit without index crediting. Before choosing any policy, work out how much life insurance you need. More guides are in our life insurance basics hub.