Indexed Universal Life (IUL) Explained
Indexed universal life (IUL) is permanent life insurance whose cash value earns interest based on how a stock market index performs, without your money actually being invested in the market. You get some of the upside, none of the direct downside, and a flexible premium. In return, you accept caps, fees and the responsibility to keep the policy funded.
The vocabulary you'll see on every IUL illustration
- Index
- The market benchmark the policy tracks, most often the S&P 500. Some carriers offer other indexes, including custom "volatility-controlled" indexes.
- Cap rate
- The maximum interest credited in a crediting period. If the cap is 10% and the index gains 18%, you're credited 10%.
- Floor
- The minimum credit, usually 0%. If the index drops 20%, you're credited 0%, not -20%.
- Participation rate
- The share of the index gain you receive. At a 100% participation rate and a 10% cap, an 8% gain earns 8%. At 80%, it earns 6.4%.
- Crediting period
- Usually one year. Gains are locked in at the end of each period and can't be lost to later market drops.
- Cost of insurance (COI)
- The monthly charge for the death benefit. It rises as you age.
- Illustration
- A projection of how the policy might perform. It shows a guaranteed column (worst case) and a non-guaranteed column (assumed rate).
How a year of crediting works
| Index result for the year | Cap 10%, floor 0%, participation 100% | What happens to cash value |
|---|---|---|
| +22% | Credited 10% | Grows, minus monthly charges |
| +6% | Credited 6% | Grows, minus monthly charges |
| 0% | Credited 0% | Shrinks slightly from charges |
| −18% | Credited 0% | Shrinks slightly from charges; no market loss |
What makes IUL appealing
- Lifetime death benefit, generally income-tax-free to beneficiaries
- Growth potential tied to the market, with protection from market losses
- Tax-deferred growth and the ability to access cash through policy loans
- Flexible premiums that can adjust to changing income
- Many include living benefit riders for chronic, critical or terminal illness
The risks people don't hear enough about
- Caps can change. The insurer can lower caps (within limits) after you buy.
- Illustrations are not promises. An illustration at 6 or 7 percent may never happen. Look at the guaranteed column too.
- Charges rise with age. An underfunded IUL can run low on cash value in your 70s or 80s and require much higher premiums to stay in force.
- Surrender charges usually apply for the first 10 to 15 years.
- Complexity. Loan types, index choices and riders take real understanding.
Who IUL tends to fit
IUL usually works best for people in their 20s to 50s who need permanent coverage, can fund it consistently above the minimum, and plan to hold it for decades. It's usually not the right tool for a 75-year-old looking for burial coverage, or for someone who can only afford the bare minimum premium.
Weighing it against guaranteed whole life? Read whole life vs IUL. Thinking about it as a savings vehicle? See IUL for long-term growth.
Carrier examples: Corebridge Financial, Mutual of Omaha and Transamerica all offer IUL products, some designed for maximum cash accumulation and others for a guaranteed death benefit at a lower cost. The same premium can produce very different results depending on the design.
Want to see an IUL illustration you can understand?
We'll walk through the guaranteed and projected columns line by line, so you know exactly what you're looking at before deciding anything.
This guide is general education, not tax, legal or financial advice. Product features, issue ages and prices vary by carrier and state and change over time.