Indexed universal life insurance (IUL) is a type of permanent life insurance that combines flexible universal life insurance mechanics with interest-crediting options linked to the performance of an external market index.
An IUL policy does not invest directly in the index. Instead, the insurance company uses a crediting formula to determine how much interest, if any, is credited to the policy based on the performance of the selected index and the terms of the crediting strategy.
That distinction is important. Indexed universal life insurance can provide death benefit protection and the potential to accumulate cash value, but its long-term performance depends on more than index returns. Policy charges, premiums, crediting terms, loans, withdrawals, and changes made by the insurance company can all affect the policy over time.
What Is Indexed Universal Life Insurance?
Indexed universal life insurance is one form of universal life insurance. Like other universal life policies, an IUL generally provides flexibility in premium payments and death benefit design, subject to the terms of the contract and the amount required to keep the policy in force.
The distinguishing feature of IUL is how interest can be credited to the policy’s accumulation value. Policy owners typically have access to a fixed account, one or more indexed crediting strategies, or a combination of both.
Indexed strategies are commonly linked to an external index such as the S&P 500, although the available indexes and crediting methods vary significantly by insurance company and policy.
Your Money Is Not Invested Directly in the Index
An IUL policy does not purchase shares of the S&P 500 or another index for the policy owner. The index is used as a reference for determining interest credits under the policy’s contractual crediting formula.
If you’re comparing IUL with other forms of permanent coverage, see our overview of the different types of life insurance policies.
How Does Indexed Universal Life Insurance Work?
An IUL policy has several moving parts that work together over the life of the contract.
Premiums Are Paid
Premium payments are made into the policy. Policy charges and expenses are deducted according to the terms of the contract.
Values Are Allocated
Available policy value may be allocated among a fixed account and one or more indexed crediting strategies offered by the insurance company.
Interest Is Credited
At the end of an index period, the carrier determines the interest credit using the index’s performance and the applicable cap, participation rate, spread, floor, or other crediting terms.
Policy Values Change
Cash value changes over time based on premiums, interest credits, policy charges, withdrawals, loans, and other activity within the contract.
The interaction among these components is why an IUL policy cannot be evaluated simply by looking at the historical performance of the index.
How Is Interest Credited to an IUL Policy?
When policy value is allocated to an indexed strategy, the carrier generally measures the change in the selected index over a defined period. The resulting index performance is then subjected to the policy’s crediting formula.
For example, a one-year point-to-point strategy may compare the index value at the beginning of a segment with its value one year later. The policy’s cap, participation rate, spread, floor, or other terms are then applied to determine the actual interest credit.
The policy owner generally does not receive the index’s actual return. Dividends may also be excluded from the index calculation depending on the strategy.
What Are IUL Segments and Index Periods?
An indexed segment is an amount of policy value allocated to a particular indexed crediting strategy for a defined period.
Each segment has a beginning date and a maturity date. At maturity, the carrier measures the applicable index performance and calculates the interest credit according to the terms of that strategy.
Because premiums may be paid at different times, a policy can contain multiple segments with different beginning and ending dates. Policies may also offer different index periods or crediting methodologies.
When a segment matures, policy value may generally be reallocated among the options available under the contract.
IUL Floors, Caps, Participation Rates, and Spreads
Understanding the crediting terms is essential when evaluating an indexed universal life policy. Different strategies can produce very different credits even when they reference the same underlying index.
| Crediting Term | What It Means |
|---|---|
| Floor | The minimum index interest credit under the applicable strategy for the crediting period. |
| Cap Rate | The maximum index interest rate that can be credited under a capped strategy. |
| Participation Rate | The percentage of applicable index performance used when calculating the interest credit. |
| Spread | An amount deducted from applicable index performance when determining the interest credit under certain strategies. |
Some strategies combine more than one of these elements. Other strategies may use thresholds, multipliers, bonuses, volatility-controlled indexes, or other features that make the crediting calculation more complex.
What Does a 0% Floor Really Mean?
Many indexed strategies provide a 0% floor on the index interest credit. If the applicable index calculation is negative for the crediting period, the strategy may receive a 0% index credit rather than a negative index credit.
That does not mean the policy cannot lose cash value.
A 0% Index Floor Is Not a 0% Floor on Policy Performance
Policy charges continue to be deducted even when an indexed strategy receives no interest credit. As a result, an IUL policy’s cash value can decline during a period in which the index credit is 0%.
This distinction is one of the most important concepts to understand when evaluating indexed universal life insurance.
Can IUL Crediting Terms Change?
Many of the terms used to calculate indexed interest are not permanently fixed at the levels shown when the policy is purchased.
Depending on the contract, the insurance company may have the ability to change current cap rates, participation rates, spreads, fixed-account rates, and other non-guaranteed elements, subject to contractual guarantees.
A strategy that looks attractive when a policy is issued may therefore operate differently years later.
For this reason, the guaranteed provisions of the contract and the carrier’s ability to change non-guaranteed elements should be considered alongside current illustrated values.
What Determines IUL Cap Rates and Participation Rates?
Insurance companies generally support indexed interest credits using the economics of their general account and financial instruments such as options rather than by directly investing policy values in the referenced index.
The economics available to support indexed strategies can change as interest rates, option costs, market volatility, carrier portfolio yields, and other factors change.
Those changing economics are one reason carriers may adjust non-guaranteed crediting terms over the life of a policy.
What Are IUL Multipliers and Bonuses?
Some IUL policies offer indexed strategies with multipliers, bonuses, enhanced participation rates, or similar features designed to increase potential interest credits.
These features should not be evaluated solely by comparing the illustrated crediting rate. Depending on the policy, an enhanced strategy may also include additional charges or different crediting mechanics.
The relevant question is how the entire strategy affects policy values under a range of outcomes—not simply whether it produces a higher illustrated value.
How Do Indexed Universal Life Insurance Illustrations Work?
An IUL illustration shows how a policy could perform under specified assumptions. It is not a prediction of future policy values.
Illustrated values can depend on assumptions about future index credits, current policy charges, premium payments, loans, withdrawals, and other non-guaranteed elements. Actual results will differ as those assumptions change.
Indexed universal life illustrations are subject to specific regulatory requirements that limit how certain index-based interest and policy loan assumptions may be illustrated. Those requirements have evolved over time as regulators have addressed increasingly complex IUL product features.
An Illustration Is a Modeling Tool, Not a Forecast
A policy that illustrates well is not necessarily a better policy. Guarantees, policy charges, crediting mechanics, funding design, carrier assumptions, and how the policy performs under less favorable scenarios all deserve consideration.
For existing coverage, an in-force illustration can help evaluate how the policy is actually performing relative to current assumptions.
How Do IUL Policy Loans Work?
Indexed universal life policies may allow the owner to borrow against available policy value. The specific loan options and mechanics vary by contract.
Some policies offer a traditional or standard loan in which the amount associated with the loan receives a specified form of interest credit. Others may offer a participating or indexed loan under which values associated with the borrowed amount can remain subject to an indexed crediting methodology.
The relationship between the loan interest charged and the interest credited to policy values can materially affect long-term performance.
Participating or indexed loans can create additional variability because the loan interest cost may be known while the future index credit is not. If credited interest is lower than the loan cost for an extended period, the loan balance can place increasing pressure on policy values.
Policy Loans Are Not Free Money
Loans accrue interest and can reduce policy values and the death benefit available to beneficiaries. A policy that lapses or is surrendered with an outstanding loan may also create tax consequences when gain exists in the contract.
How Are IUL Withdrawals and Loans Taxed?
Life insurance receives favorable tax treatment under current federal tax law, but descriptions of policy distributions as simply “tax-free income” can be misleading.
Access to policy value depends on factors including the owner’s investment in the contract, the structure of withdrawals and loans, whether the policy is a Modified Endowment Contract (MEC), and whether the policy remains in force.
Withdrawals generally reduce policy values and may reduce the death benefit. Policy loans accrue interest and can also reduce the death benefit and available cash value.
If a policy with gain lapses or is surrendered while a substantial loan is outstanding, taxable income can result even though the policy owner may not receive additional cash at that time.
A policy classified as a MEC is subject to different distribution rules, including different treatment of loans and withdrawals.
What Are the Risks of Indexed Universal Life Insurance?
IUL can provide useful flexibility, but that flexibility comes with additional variables that need to be managed over time.
Non-Guaranteed Performance
Actual index credits can be lower than illustrated, and non-guaranteed crediting terms may change over time.
Policy Charges
Insurance and policy expenses continue even when an indexed strategy receives little or no interest credit.
Funding Risk
A policy funded near minimum assumptions may require additional premiums if actual experience is less favorable than originally illustrated.
Loan Risk
Large or growing policy loans can materially affect cash value, death benefit, lapse risk, and potential tax consequences.
When Might Indexed Universal Life Insurance Be Appropriate?
IUL may be considered when permanent life insurance is needed and the policy owner values premium flexibility and index-linked interest-crediting potential.
It may also be used in estate planning, business planning, or supplemental accumulation strategies when the life insurance need and policy design support those objectives.
Whether IUL is appropriate depends on more than its potential cash value. The need for death benefit protection, expected funding, time horizon, tolerance for non-guaranteed performance, and willingness to monitor the policy should all be considered.
When Might Another Type of Life Insurance Be More Appropriate?
An IUL policy is not inherently better than whole life, traditional universal life, variable universal life, or another form of coverage.
A policy owner who prioritizes stronger contractual guarantees and fewer non-guaranteed variables may prefer a different type of permanent insurance. Someone seeking direct participation in investment markets may find that variable universal life provides a more appropriate structure, subject to its investment risks.
In other situations, permanent coverage may not be necessary at all and term insurance may better address the underlying protection need.
The appropriate policy type depends on what the coverage is intended to accomplish.
How Should an Existing IUL Policy Be Reviewed?
Indexed universal life insurance should not be treated as a policy that can simply be purchased and ignored for decades.
An ongoing review should consider current cash value, death benefit, premiums paid, cost basis, policy loans, current crediting terms, policy charges, guarantees, and updated projections of future performance.
An in-force illustration can then be used to test whether the policy remains on track under current assumptions and under less favorable scenarios.
If the policy is no longer aligned with the owner’s objectives, the analysis can also consider whether changing the existing policy or evaluating alternatives through a life insurance 1035 exchange may be appropriate.
The Bottom Line
Indexed universal life insurance combines permanent death benefit protection with flexible universal life mechanics and index-linked interest-crediting strategies. That flexibility can make IUL useful in the right situation, but it also creates more variables for the policy owner to understand and manage.
The index itself is only one part of the equation. Policy charges, funding, crediting terms, guarantees, loans, withdrawals, and actual policy performance can be equally important to the long-term outcome.
For that reason, an IUL policy should be evaluated based on its complete design and monitored over time rather than judged primarily by an illustrated rate or historical index performance.
