By Christian BrinkleyLicensed NC Insurance Agent, NPN 22217190, NC Life & Health · Updated November 7, 2026 · 4 min read
Indexed universal life, usually shortened to IUL, is permanent life insurance. It pays a death benefit like other permanent policies, and it builds a cash value account. The difference is how that cash value grows. Instead of a rate the insurer declares, growth follows a stock market index, usually the S&P 500, capped on the upside and floored at zero. You do not own the index or any shares. The index is only a measuring stick for the interest credited.
How the cash value is credited
Each premium goes in after the insurer takes out its charges for the insurance itself. What is left goes into the cash value account. That account is measured against a stock index over a set period, often a year. At the end of the period, the insurer credits interest based on the index move, within the limits below. The gain, once credited, is locked in. Your money is never invested in the market. The insurer keeps it in its own general account and uses the index only to calculate the credit, and dividends are usually not counted.
Caps, participation rates, and the floor
Three numbers decide how much interest your cash value earns. The cap is the most the insurer will credit, no matter how far the index rises. Caps on S&P 500 accounts commonly run about 8 to 12 percent in 2026 carrier guides. The participation rate is the share of the index gain that counts toward your credit, usually from 50 percent to over 100 percent. The floor is the lowest rate credited, usually 0 percent.
| What it does | Example | |
|---|---|---|
| Cap | The most interest credited in one period | Index rises 15%, cap is 9%: credited 9% |
| Participation rate | The share of the index gain that counts | Index rises 8%, participation is 75%: credited 6% |
| Floor | The lowest rate credited, usually 0% | Index falls 20%: credited 0% |
Say the index rises 12 percent, participation is 80 percent, and the cap is 9 percent. Participation brings the gain to 9.6 percent, and the cap brings it to 9 percent. These are round figures to show the math, not rates from any insurer.
What the floor does and does not do
The floor is often misunderstood. It sets a floor on the interest credited, not on the account itself. When the index falls, the policy credits nothing, but monthly charges still come out. The account can fall in a flat year, even with a 0 percent floor. Only the floor is usually guaranteed. The insurer can lower the cap and participation rate over time, down to the guaranteed minimums. A spread is a flat percentage subtracted from the index gain before crediting.
The lapse risk
An IUL can lapse quietly. The cost of insurance rises with age and comes out every month, whatever the index does. If you pay the minimum and the credits come in lower than illustrated, the cash value drains to cover the charges. When it runs out, the policy ends with no payout. In 2019, New York regulators reported owners who paid for years and found their policies had lapsed with little or no value. An illustration is a projection, not a promise. Actuarial Guideline 49-A tightened the rules for illustrations on policies sold on or after December 14, 2020. Ask for an in-force illustration every few years.
Who it fits, and who it does not
An IUL can fit someone who needs permanent coverage for life, wants some cash value growth, and accepts capped growth and a policy that needs attention. It is not a retirement account or a substitute for a 401(k) or an IRA. As an investment alone, it usually grows more slowly than money invested directly, because charges come out first and caps limit the upside. Surrender charges cut what you can take out early, so it fits poorly for short-term needs.
Questions to ask before you buy
Ask what the cap, participation rate, floor, and spread are today, and the guaranteed minimums if the insurer lowers them. Ask for the cost-of-insurance schedule, to see how charges rise with age. Ask how long surrender charges last, and ask to see the illustration at guaranteed rates. And ask what premium keeps the policy in force to age 90 or 100.
I am a licensed insurance agent in North Carolina. If you are weighing indexed universal life against whole life or guaranteed universal life, call or text (919) 408-6671.
Questions people ask me about this
Can I lose money in an indexed universal life policy?
The floor protects the interest credit, not the account value. Charges come out every month, so the cash value can fall in years with little or no index credit, and surrender charges can reduce what you could take out early.
Is indexed universal life the same as investing in the S&P 500?
No. You own no shares and receive no dividends. The index is only a measuring stick for the credit, and the credit is capped.
Is indexed universal life a good investment?
It is insurance first. As an investment it usually grows more slowly than money invested directly, because insurance charges come out first and caps limit the upside.
What happens if I stop paying premiums?
The cash value covers the monthly charges for a time. When it runs out, the policy lapses. Loans left unpaid can also leave a tax bill.