What is indexed universal life insurance?
Indexed universal life (IUL) is permanent life insurance with a cash value that earns interest based on the performance of a market index, most often the S&P 500. Your money is not invested in the market. Instead, the insurance company credits interest using a formula tied to the index.
Two numbers frame that formula: a floor (often 0%) so a bad year doesn't credit a loss, and a cap or participation rate that limits the upside. Learn the details in caps, floors and participation rates.
How IUL cash value grows
Each premium pays the policy's cost of insurance and fees; the rest goes to cash value. You choose how to allocate it between a fixed account and one or more index accounts. At the end of each crediting period, interest is credited based on how the index did, within the cap and floor.
Because losses aren't credited in down years, you don't have to make up lost ground when the market recovers. But in strong years, the cap limits what you earn. Policy charges are still deducted every year, including years where the index credits 0%.
Flexible premiums
Unlike whole life, IUL lets you adjust how much and how often you pay within limits. That flexibility is powerful, and it's also the most common way IULs get into trouble. Underfunding a policy, or relying on overly optimistic illustrated rates, can cause it to lapse later in life. A good IUL is designed and funded with a margin of safety and reviewed regularly.
IUL for retirement income
A properly funded IUL can be designed to provide supplemental retirement income through policy loans. When the policy is structured to avoid becoming a modified endowment contract (MEC) and remains in force, those loans are generally received income-tax-free. See how tax-free retirement income from life insurance works.
Pros and cons of IUL
Pros
- Index-linked growth potential
- Floor protects credited interest from market losses
- Flexible premiums and death benefit
- Potential tax-advantaged access to cash value
- Many policies include living benefits
Cons
- Caps limit upside in strong years
- Caps and charges can change over time
- Illustrations are projections, not guarantees
- Underfunding can cause a lapse
- Surrender charges in early years
Who IUL is best for
IUL tends to fit people who want lifelong protection plus growth potential, have a long time horizon, and can fund the policy consistently, often high earners looking for options beyond their 401(k) or Roth IRA. If you'd rather have guarantees than flexibility, compare whole life. Before you buy any IUL, read the red flags to watch for in an illustration.
Common questions
Can you lose money in an IUL?
The floor keeps credited interest from going negative because of index losses, but policy charges are deducted every year. In years with low or zero crediting, cash value can go down. Surrendering early can also mean receiving less than you paid.
What is a good cap rate for IUL?
Caps vary by carrier, index and crediting strategy and can change over time. More important than today's cap is the carrier's history of maintaining caps and how conservatively the policy is illustrated.
Is IUL better than a 401(k)?
They do different jobs. A 401(k) with an employer match is hard to beat for many people. IUL can complement it with life insurance protection and potential tax-free access, especially once other tax-advantaged options are maxed out.
How long does it take to build cash value in an IUL?
Most IULs take several years to build meaningful cash value because early-year costs are higher. Designing for maximum funding helps growth start sooner.