Indexed universal life, or IUL, is one of the most talked-about and most misunderstood types of life insurance. You may have seen it pitched online as a way to “grow money with no market risk.” The reality is more nuanced. An IUL can be a useful tool for some people, but it has moving parts that matter. This guide explains how it works, in plain English, without projections or promises.
Quick takeaway
- An IUL is permanent life insurance with flexible premiums and cash value credited based on changes in a market index, within limits the insurer sets.
- You aren’t invested in the index. Caps, participation rates, and floors decide how much interest is credited.
- Policy charges, including cost of insurance that usually rises with age, come out of the cash value.
- Illustrations are hypothetical and not guaranteed. An underfunded IUL can lapse.
IUL in one paragraph
An indexed universal life policy is a type of universal life insurance, which is permanent coverage with flexible premiums and an adjustable death benefit. What makes it “indexed” is how the cash value earns interest: instead of a declared rate, interest is credited based partly on changes in a market index, such as a stock index, subject to limits set by the insurer. Policy charges come out of the cash value each month.
You’re not invested in the market
This point causes a lot of confusion. With an IUL, your money isn’t invested in the stock market or in the index itself. The insurer uses the index only as a yardstick to calculate interest credits. That’s why IULs typically have a floor protecting against negative index-based credits, and also why they have caps or other limits on the upside.
How crediting works
Most IULs let you allocate cash value among one or more index accounts (sometimes called segments or strategies) and, often, a fixed account. Each index account has its own rules:
- Crediting period: commonly one year. The insurer compares the index value at the start and end of the period.
- Cap rate: the maximum interest that can be credited for the period.
- Participation rate: the percentage of the index change used in the calculation.
- Floor: the minimum credit for the period, often 0%, so a negative index change doesn’t reduce cash value through crediting.
- Spread or fee: some accounts subtract a percentage from the index change.
Index changes often exclude dividends paid by the stocks in the index.
A made-up example of the math
To show how these pieces interact, here’s a simple example with made-up numbers. They aren’t actual, typical, or expected results.
- Suppose an index account has a 100% participation rate, a cap of 9%, and a 0% floor.
- If the index rose 12% over the crediting period, the credit would be capped at 9%.
- If the index rose 4%, the credit would be 4%.
- If the index fell 15%, the credit would be 0%.
Remember that charges come out regardless of the credit. In a 0% year, the cash value can still go down because of policy charges.
Caps and rates can change
Insurers can usually change caps, participation rates, and spreads on future crediting periods, within guaranteed minimums or maximums in the contract. Ask what the guaranteed minimum cap and participation rate are, not just the current ones.
Policy charges
IULs have several charges, which vary by policy:
- Cost of insurance (COI): the charge for the death benefit, based on your age, health class, and the amount at risk. It usually rises as you get older.
- Premium loads: a percentage taken from each premium.
- Administrative or policy fees: monthly or annual charges.
- Rider charges: for added features like long-term care or chronic illness riders.
- Surrender charges: if you cancel in the early years, often for 10 years or more.
Because COI charges rise with age, a policy that looks healthy at 45 can come under pressure at 75 if it wasn’t funded well.
Flexible premiums: a feature and a risk
Unlike whole life, an IUL lets you vary how much you pay, within limits. That flexibility can help in a tight year. But if you pay too little for too long, or credits are lower than illustrated, charges can drain the cash value and the policy can lapse. Many IULs offer a no-lapse guarantee rider for a period if you meet its premium requirements. Ask whether yours has one and what it requires.
Illustrations and AG 49-A
IULs are sold with illustrations that project cash value and death benefits using an assumed crediting rate. Those projections are hypothetical and not guaranteed.
The NAIC adopted Actuarial Guideline 49-A to bring uniformity to illustrations of policies with index-based interest sold on or after December 14, 2020. Among other things, it limits the maximum illustrated crediting rate, limits how much policy loan leverage can be shown, and requires an additional ledger using a lower “alternate scale” with equal prominence. The NAIC adopted further revisions in December 2025; for policies sold on or after April 1, 2026, illustrations must include a statement substantially similar to: “Historical index changes shown in this illustration are not indicative of future returns.”
States adopt illustration rules differently. The NAIC’s state chart for its illustrations model regulation lists Tennessee as having no current activity, so ask how any illustration you’re shown was prepared and whether it follows AG 49-A.
Who might consider an IUL
An IUL may fit someone who wants permanent coverage, can fund the policy consistently over many years, wants some potential for interest tied to an index with a floor, and is willing to monitor the policy. Our article on IUL pros and cons goes deeper.
Frequently asked questions
Is IUL money invested in the stock market?
No. The insurer credits interest based on changes in an index, but your cash value isn’t invested in the index.
Can you lose money in an IUL?
The floor typically prevents negative index credits, but policy charges continue. Cash value can decline in low-credit years, and surrender charges apply in early years. An underfunded policy can lapse.
What are caps and participation rates?
A cap is the maximum interest credited for a period. A participation rate is the share of the index change used to calculate the credit. Both can change within contract limits.
Are IUL illustrations guaranteed?
No. Illustrations are hypothetical projections. Ask for the guaranteed values and the alternate scale ledger as well.
Next step
Eric can explain an IUL illustration line by line, including the guaranteed column and the charges. Learn more about life insurance with Eric Henry, Insurance Agent, or compare permanent options in our term vs. whole life guide.
Coverage descriptions are general information only; your policy documents determine actual coverage. Availability varies by carrier.
