1 What IUL actually does
Indexed Universal Life (IUL) is permanent life insurance with a cash value account that grows based on a stock market index — usually the S&P 500. When the index goes up, your cash value earns interest up to a cap. When the index drops, your cash value doesn't lose money — a 0% floor protects it. Cash value grows tax-deferred, and you can access it tax-free in retirement through policy loans.
An IUL policy does two things at the same time. First, it pays a death benefit to your family — if you pass away while the policy is active, your beneficiary receives a tax-free lump sum. Second, it builds a cash value account that you own. Over time, the cash value compounds and you can borrow from it tax-free for any reason — retirement income, college, a business, a down payment, or a medical emergency.
2 How the cash value grows
The cap — your upside limit
A cap is the maximum interest rate credited to your cash value in a given year. If your cap is 10% and the S&P 500 goes up 14%, your cash value is credited 10% — not 14%. Caps on most IULs today sit in the 8% to 12% range.
The floor — why you can't lose money to the market
When the market drops, your cash value doesn't go backward. Your money isn't directly invested in the stock market — the insurance company credits you interest based on how an index performed. A down year means you're credited 0% for that year — you don't lose a dollar. That's the 0% floor.
Market goes up
S&P 500 +7%
You earn 7%
Market surges
S&P 500 +14%
You earn 10%
(cap applies)
Market drops
S&P 500 −20%
You earn 0%
(floor protects you)
4 Frequently asked questions
What is IUL and how does it work?
IUL stands for Indexed Universal Life. It's permanent life insurance with a cash value account that grows based on a stock market index (usually the S&P 500). When the index goes up, your cash value earns interest up to a cap. When it drops, you don't lose money — a 0% floor protects you. Cash value grows tax-deferred, and you can access it tax-free through policy loans.
Can you lose money with an IUL?
You can't lose money from market drops — the 0% floor protects you. However, cost of insurance and policy fees are deducted monthly. If the policy is underfunded or you hit a long run of 0% years, fees can eat into your cash value. Properly funded, this is unlikely.
How much do I need to contribute?
Most properly designed IUL policies are funded at $300 to $2,500+ per month, depending on age, health, and goals. The maximum is set by IRS rules to keep the policy from becoming a Modified Endowment Contract (MEC). A good agent runs an illustration showing the funding range for your situation.
Do I need a medical exam?
Many carriers offer no-exam underwriting up to $1 million for healthy applicants ages 20-59. Larger amounts or health concerns may require a paramed exam. A licensed agent can tell you which carriers will waive the exam for your situation.
Can I borrow from my IUL before retirement?
Yes. Unlike a 401(k) or IRA, there's no age 59½ restriction. You can take a policy loan at any age for any reason — home, business, college, emergency. The loan is tax-free as long as the policy stays active.
How is IUL different from whole life?
Both are permanent. Whole life has a fixed rate (3–5%). IUL grows based on a market index with a 0% floor and a cap (8–12%). Whole life offers predictability. IUL offers higher growth potential with downside protection. Neither is universally better — it depends on your goals.
5 IUL terms explained
- Cash Value
- The account inside your IUL that grows over time. You own it and can borrow from it tax-free.
- Cap Rate
- Maximum interest credited per year. Typically 8–12%.
- Floor
- Minimum interest credited. Usually 0% — you don't lose money in down years.
- Policy Loan
- Tax-free access to your cash value. Not a withdrawal. Unpaid loans come out of the death benefit.
- Cost of Insurance
- Monthly charge for the death benefit portion. Increases with age.
- MEC
- Modified Endowment Contract. An overfunded policy that loses some tax benefits. Proper design avoids this.