Indexed Universal Life (IUL) Insurance

Last reviewed September 15, 2026

Permanent coverage with a flexible premium and a cash value that earns interest tied to a stock index, with a cap on the upside and a floor on the downside, without holding the stocks. The illustration is a projection, the charges rise with age, and how it is funded decides whether it works.

Universal life took whole life apart into its pieces. Premiums go into an account; each month the carrier deducts the cost of insurance for the death benefit that month, plus administrative and per-thousand charges; the balance earns interest. The owner chooses how much to pay, within a minimum that keeps the policy alive and a maximum the tax code allows, and can change it. Indexed universal life is the version where the interest credited is tied to the movement of a market index rather than a rate the carrier declares.

The index link works through options, not stocks. The cash value sits in the carrier's general account, and the carrier uses part of the interest it would have credited to buy options on the index. If the index rises over the crediting period, the account is credited with the gain up to a cap, sometimes scaled by a participation rate; if the index falls, the floor applies and the account is credited nothing, or a small fixed amount, rather than losing value. Dividends from the index's stocks are not included. The cap, the participation rate and the floor are set by the carrier and can be changed on existing policies within the contract's limits.

The trap is in the charges. The cost of insurance rises every year with age, and in the later decades it becomes large; a policy funded at the minimum in the early years, or one whose credited interest fell short of the illustration, can find the charges consuming the cash value and lapse when the owner is old, with nothing paid. A policy funded near the maximum from the start behaves very differently, which is why the funding plan matters more than the product.

The analysis reads the illustration at the guaranteed minimum interest and maximum charges, at a moderate rate, and at the agent's rate, and tells you whether the design works in the poor case and not only the good one. For a person who has not yet filled a retirement account, or who would fund the policy lightly, the usual recommendation is term and the retirement account.

Covered and not covered

Covered

The death benefit to beneficiaries as long as the policy stays in force
Interest credited from index gains up to the cap and never below the floor
Cash value growth that is not taxed while it stays in the policy
Premiums that can be raised, lowered or paused within the contract's limits
Withdrawals up to the premiums paid, and loans beyond, without a credit check
The policy kept in force by a no-lapse guarantee where the required premium is paid
An accelerated benefit for terminal, and on some contracts chronic, illness

Not covered

Stock dividends, which the index credit leaves out
Index gains above the cap or beyond the participation rate
The full illustrated values: the illustration is a projection under assumptions, not a promise
A death after the policy lapses because charges exhausted the cash value
Cash value in the early years, which surrender charges can consume entirely
Suicide and material misstatement within the contract's exclusion and contestability periods
Any part of the death benefit offset by an unpaid loan

What indexed universal life (iul) insurance does

Death benefit options

The owner chooses a level death benefit, where the face amount stays fixed and the cash value grows inside it, or an increasing benefit, where the beneficiaries receive the face amount plus the cash value. The increasing option costs more each month because the amount at risk to the carrier does not shrink as cash value grows; the level option is cheaper and is usually switched to once accumulation is the goal. The policy has to keep a minimum gap between cash value and death benefit under the tax code to remain life insurance, and the carrier raises the benefit automatically if the cash value gets too close.

Interest crediting: caps, floors and participation

A crediting method defines the period, usually a year, and how the index change is measured, point to point or averaged. The cap is the most the account can be credited in the period regardless of the index; the participation rate is the share of the index gain that counts; the floor is the least it can be credited, commonly zero. Some designs offer an uncapped strategy with a lower participation rate or a spread deducted from the gain, and some charge a fee for a higher cap. The strategies can be mixed and changed each year, and the carrier can reset caps and participation rates on existing policies, which the guaranteed minimum column of the illustration assumes it does.

Charges and the cost of insurance

Every month the carrier deducts a premium load on money coming in, a per-thousand charge on the face amount for the first years, a flat administrative fee, and the cost of insurance, which is the mortality charge on the difference between the death benefit and the cash value at your current age. That last item climbs steeply past the mid-sixties. Illustrations show the current charges and the maximum charges the contract allows; the carrier can move toward the maximum, and the cash value has to be able to survive that.

Loans and withdrawals

The cash value can be withdrawn up to the premiums paid without tax, and borrowed beyond that. A standard loan charges interest and moves the borrowed amount to a fixed account; a participating or indexed loan leaves the money in the index strategy while charging interest, which can win or lose depending on the year. Loans reduce the death benefit and, if they compound faster than the account, can collapse the policy and trigger tax on the gain. This mechanism is the basis of the retirement income designs the product is sold for, and it works only if the policy has been funded heavily for many years.

Surrender charges and the no-lapse guarantee

A surrender charge applies if the policy is cancelled or the face amount reduced in the early years, often for more than a decade, and it can take the whole cash value in the first few years. Some contracts offer a no-lapse guarantee that keeps the policy in force to a stated age as long as a set premium is paid on time, regardless of the account; it is worth having, and it is usually lost the moment a premium is missed or a loan is taken.

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Related lines

Life InsurancePays a lump sum to the people you name when you die, generally free of income tax, so that the income, the mortgage and the plans that depended on you continue. Term covers a period; permanent covers a lifetime and builds cash value. Which one, and how much, is arithmetic rather than instinct.
Term Life InsuranceThe plain version of life insurance: a fixed death benefit for a set number of years at a premium that does not change, and nothing paid if you outlive it. It buys the largest benefit per dollar during the years a family depends on an income, which is why it is what we usually recommend.
Whole Life InsurancePermanent coverage with three fixed things: a premium that never rises, a death benefit that never falls, and a cash value that grows on a schedule printed in the contract. Costs several times what term does for the same benefit, and fits needs that do not expire.
AnnuitiesA contract with an insurer that turns a sum of money into a stream of payments, now or later. The contract decides how the balance grows, when payments start, what leaving early costs and what passes to heirs; the analysis reads those terms before anything is signed.