Indexed Universal Life (IUL): The Complete Guide

What is indexed universal life?

Indexed universal life, or IUL, is permanent life insurance. It is designed to last your whole life, not a set term, as long as the policy has enough value to pay its own charges. It has two parts that work together.

• A death benefit. The amount paid to your beneficiaries when you die. It is the reason the policy exists.
• A cash value. An account inside the policy. Your premiums go in, the policy's charges come out, and interest is credited to what remains.

The "universal" part means the premium is flexible. Within limits set by the policy and by federal tax law, you choose how much to pay and when. The "indexed" part describes how interest is credited. Instead of one declared rate, most of the cash value earns interest from a formula tied to a stock market index, such as the S&P 500.

Two facts shape everything else in this guide. First, your money is never invested in the index. The insurer holds your cash value in its own general account and uses the index only to calculate a credit. Carrier brochures say this plainly: the premiums are not invested in stocks, and the index performance does not include dividends. Second, the policy is a bundle of insurance and costs. The cost of the insurance and the policy's expenses come out every month, whatever the index does.

If you want the mechanics at a slower pace, start with how IUL works. If you want the honest summary first, read IUL pros and cons.

How premiums flow through an IUL

Follow one premium dollar through the policy and most of the confusion goes away.

1. You pay a premium. The policy sets a minimum needed to keep it going and a maximum allowed by the tax rules. You can pay anything in between, and you can often skip or reduce payments if the cash value can cover the charges.
2. A premium charge comes off the top. Most policies take a percentage of each payment for sales costs and premium taxes. The policy shows both the current charge and a higher guaranteed maximum the carrier is allowed to move up to.
3. The rest goes to the cash value. You choose how it is split between a fixed account (a declared interest rate with a guaranteed minimum) and one or more index accounts.
4. Monthly deductions come out. Every month the policy deducts its charges from the cash value. They typically include: - a flat policy fee (the same guide shows $5 a month current and $10 guaranteed maximum); - a charge per $1,000 of death benefit, often heaviest in the early years; - the cost of insurance, which pays for the death benefit protection; and - the cost of any riders you added.
5. Interest is credited. The fixed account earns its declared rate. Each index account earns an index credit at the end of its crediting period, according to its formula.
6. Surrender charges apply if you leave early. If you cancel the policy in its early years, a surrender charge is subtracted from the cash value. What you actually get back is the cash surrender value. Surrender periods of 10 to 15 years or more are common, so check the schedule in your illustration.

The cost of insurance deserves a closer look because it drives long-term results. It is charged on the "net amount at risk," which is roughly the death benefit minus the cash value: the part of the death benefit the insurer would pay out of its own pocket. The rate per dollar of coverage rises as you age. A policy with a big death benefit and a small cash value pays a lot of cost of insurance in later years. A policy with a strong cash value pays less, because the insurer has less at risk. Most of these charges have a current rate and a higher guaranteed maximum, and the insurer can raise current charges up to that maximum. Our guides to IUL cost of insurance and IUL fees and charges go line by line.

Here is where a hypothetical first-year premium could go. These numbers are made up to show the flow, not taken from any one policy.

That last line is why an IUL is a long-term commitment. In the early years the cash surrender value can be a small fraction of what you paid. See IUL surrender charges for how the schedule shrinks over time.

How index crediting works

Each index account has a formula. The insurer measures how much the index changed over the crediting period, usually one year, then applies the account's limits. The main ones are below, and each has its own deep-dive page.

• Floor. The lowest credit the account can give, usually 0%. If the index falls 20%, the account credits 0%, not -20%. A few accounts currently declare a floor slightly above zero, but only the guaranteed floor is promised. See the IUL floor.
• Cap. The highest credit the account can give for the period. If the cap is 10% and the index rises 18%, you get 10%. See IUL cap rates.
• Participation rate. The share of the index gain you receive. At 60% participation, an index gain of 10% credits 6%. Some accounts pay more than 100% of a specially designed index. See IUL participation rates.
• Spread. A percentage subtracted from the index gain before crediting. With a 5% spread, a 12% index gain credits 7%, and any gain under 5% credits nothing.
• Crediting period and method. Most accounts compare the index value on the first and last day of a one-year period ("annual point-to-point"). Others use two-year periods, monthly caps added together, or monthly averages. See IUL index crediting methods.

To see real terms, here are several accounts from one current product. Nationwide's sales guide lists these for its Indexed UL Accumulator III, as of March 7, 2026: a 1-year S&P 500 point-to-point account with a 10.50% cap and 100% participation; a 1-year S&P 500 uncapped account with 100% participation and a 5.50% spread; and a 1-year account on a volatility-controlled index (BNP Paribas Global H-Factor) with 260% participation and no cap. All of its accounts carry a guaranteed 0% floor (Nationwide currently declares 0.5% on the H-Factor accounts). Rates like these change often, so treat them as an example of how accounts differ, not as today's offer.

That last account shows a trend worth understanding. Volatility-controlled indexes are custom indexes that shift between stocks and bonds or cash to keep their swings within a target range. Because they are cheaper for the insurer to hedge, they can support participation rates well above 100%. A high participation rate on a low-volatility index is not the same as a high participation rate on the S&P 500. Some of these accounts also charge a fee for the richer terms: Nationwide lists a 300% participation version of that account with a 0.75% strategy charge as of March 2026, deducted from the amount placed in each new segment when it starts. Read more in volatility-controlled indexes and IUL index options.

A worked example: three formulas, four years

The table below uses hypothetical index changes and hypothetical account terms to show how each formula treats the same year. None of these are current rates.

No single formula wins every year. Caps do best in moderate years. Participation and spread accounts do best in big years and worst in small ones. Insurers generally set each account's terms so the options behind it cost about the same (the account's "hedge budget"), which is why a richer term in one place usually comes paired with a trade-off somewhere else. Our index crediting backtest lets you run past index history through different terms.

Why a 0% year still costs you money

This is the single most misunderstood point about IUL. The floor protects the index credit. It does not protect the cash value, because the policy's charges come out every month no matter what.

Here is a hypothetical year for a policy in its eighth year. No premium is paid this year, and the monthly deductions (policy fee, per-$1,000 charge and cost of insurance) total $150 a month. For simplicity, the credit is applied to the starting value.

In the down year the index lost 15%, the policy credited 0%, and the cash value still fell $1,800, or 3%. That is far better than a 15% market loss, and it is the protection IUL buyers pay for. But it is not "no loss." As you age and the cost of insurance rises, a string of 0% years can do real damage, especially if you have stopped paying premiums or are taking loans. How carriers credit the portion used for monthly deductions varies: North American's brochure, for example, describes crediting on the segment's starting value even as deductions reduce it during the year. Ask how your policy handles it.

Death benefit options

When you buy an IUL, you choose how the death benefit relates to the cash value. A Pacific Life policy form filed with the SEC in 2020 (for a variable universal life policy with indexed options) defines three options clearly, and many carriers use the same letters or call them Option 1 and Option 2.

• Option A (level). The death benefit equals the face amount. As the cash value grows, the net amount at risk shrinks, so cost of insurance tends to be lower. Your beneficiaries do not receive the cash value on top of the face amount.
• Option B (increasing). The death benefit equals the face amount plus the cash value. Your beneficiaries get both, but the insurer always has the full face amount at risk, so cost of insurance is higher.
• Option C (return of premium). The death benefit equals the face amount plus the premiums you have paid, minus withdrawals, up to a limit stated in the policy. Not every policy offers it.

A common design for people who want cash value is to start with Option B while premiums are going in, then switch to Option A before taking income. That keeps cost of insurance lower later on. Changing options has rules and sometimes limits, so check your policy. Whichever option you pick, federal tax law may force the death benefit higher than you chose, if the cash value grows large relative to it (see the corridor below). Details are in IUL death benefit options.

How IUL is taxed

The tax treatment is a major reason people buy IUL, and it is also where the most expensive mistakes happen. This section is general information, not tax advice. Our IUL taxes guide goes deeper, and a tax professional can apply it to your situation.

The policy must qualify as life insurance (IRC 7702)

Section 7702 of the Internal Revenue Code sets the test. A policy must pass either the cash value accumulation test or the guideline premium test plus the cash value corridor. In plain terms, these limit how much cash value a policy can hold compared with its death benefit, and how much premium can go in. Under the corridor that goes with the guideline premium test, for example, the death benefit must be at least 250% of the cash value while the insured is 40 or younger, falling gradually to 100% at age 95. If a policy fails, the income on the contract is taxed as ordinary income each year. Insurers monitor this and will refuse premiums or raise the death benefit to keep a policy qualified. More in our guide to Section 7702.

The MEC line (IRC 7702A)

A second test, in Section 7702A, decides whether a policy is a modified endowment contract (MEC). A policy fails the seven-pay test if the premiums paid at any point in the first seven contract years exceed what it would have taken to pay the policy up with seven level annual premiums. Certain "material changes," such as some increases in the death benefit, restart the test.

A MEC is still life insurance, and the death benefit keeps its tax treatment. What changes is access to cash:

• Loans and withdrawals are taxed gain first, as ordinary income, until all the gain has come out.
• The taxable part carries a 10% additional tax under IRC 72(v), unless you are 59 and a half or older, disabled, or taking substantially equal periodic payments.
• A MEC stays a MEC. A policy received in exchange for a MEC is also a MEC.

When the goal is accessible cash value, the policy is designed to stay just under the MEC line. See modified endowment contracts.

Withdrawals, loans and basis in a policy that is not a MEC

Your basis (the tax code calls it "investment in the contract") is generally the premiums you paid, minus amounts you already received tax-free. For a policy that is not a MEC:

• Withdrawals come out basis first. Under IRC 72(e)(5), they are taxable only to the extent they exceed your investment in the contract. Withdrawals also reduce the death benefit and may carry surrender charges in the early years.
• Policy loans are not treated as distributions, so they are not taxed when taken, as long as the policy stays in force. This is how an IUL can provide income without income tax after basis has been withdrawn.

So when anyone describes IUL income as "tax-free," the full sentence is this: loans and basis withdrawals from a policy that is not a MEC are not taxed while the policy stays in force. The rest of this section is about what happens when it does not.

The lapse tax trap

If a policy lapses or is surrendered with a loan outstanding, the IRS treats the loan as paid off with the policy's value. That payoff counts as an amount you received. Anything above your basis is taxable income that year, even though you receive no cash. The U.S. Tax Court has applied this rule. In Jarvis v. Commissioner, for example, a whole life policy that had paid its premiums for years through automatic policy loans lapsed in 2009 when the loans and interest exceeded its cash value, and the court held that the owner had $37,981 of taxable income.

This is the worst realistic outcome in IUL: years of loans, a policy that runs dry in your 80s, a lost death benefit, and a tax bill on money you spent long ago. It is avoidable with conservative loans, annual reviews and, where it fits, an overloan protection rider. More in IUL lapse risk.

The death benefit (IRC 101)

Under IRC 101(a), amounts paid under a life insurance contract because the insured died are generally excluded from the beneficiary's gross income. The main exception is a policy that was transferred for value, such as one bought from another owner. Any loan balance is subtracted from the payout. Accelerated death benefits paid to a terminally or chronically ill insured can also qualify for the exclusion under IRC 101(g), with limits for chronic illness payments; IRS Publication 525 lists a per diem limit of $420 a day for 2025.

1035 exchanges

Section 1035 lets you exchange one life insurance policy for another, or for an annuity, without current tax on the gain. An exchange can be the right move for an old policy with high charges, but it usually brings new surrender charges and new underwriting. Our IUL 1035 exchange guide covers when it makes sense.

Policy loans: how they work and what can go wrong

A policy loan is a loan from the insurer, with your cash value as collateral. You do not need to qualify, there is no required repayment schedule, and interest accrues. Unpaid interest is added to the loan balance and then charges interest itself, so an unpaid loan compounds. Most IUL policies offer two types.

• Fixed (standard) loans. The borrowed amount is moved out of the index accounts into a collateral account that earns a set rate. The loan charges a set rate. The difference is your cost. Many policies narrow or close that gap after a set number of years, which is why these are sometimes called wash loans. Check both the current and the guaranteed loan rates in the policy.
• Participating (indexed or variable) loans. The borrowed amount stays in the index accounts and keeps earning index credits, while the loan charges its own rate. The same guide caps the index loan charge at 6%. If the index credit beats the loan rate, you come out ahead. If the credit is 0%, you pay the full loan rate and earn nothing on that money.

Participating loans are where many illustrations look best and many real policies get hurt. A run of low-credit years while borrowing at a participating loan rate can drain a policy quickly. Regulators have limited how much of this "arbitrage" an illustration may assume (see AG 49-A below), but they cannot limit what actually happens.

Guardrails that help:

• Borrow less than the illustration says you can. Plan income at a lower credited rate than the one illustrated.
• Watch the loan-to-value ratio every year, not only the dollar amount of the loan.
• Know your policy's loan interest rates, both current and guaranteed maximum.
• Ask whether an overloan protection rider is available. It can keep a heavily borrowed policy from lapsing, typically by reducing the death benefit and locking the policy in place once conditions are met. Nationwide's current guide says its version has no monthly charge but has a cost if you use it; North American notes that exercising such a rider can in some cases make a policy a MEC. See overloan protection rider.

Loans and withdrawals are compared side by side in IUL loans vs withdrawals, and the full loan guide is IUL policy loans.

Illustrations and the AG 49 rules

An illustration is the insurer's projection of how a policy might perform under set assumptions. It is a sales document, not a promise. The NAIC's Life Insurance Illustrations Model Regulation (#582) sets the basic rules that state regulators build on. A basic illustration must show a numeric summary for at least policy years 5, 10 and 20 and at age 70 on three bases: the policy guarantees, the insurer's illustrated scale, and a midpoint scale using rates halfway between the two. You sign a statement that you understand the non-guaranteed elements "are subject to change and could be either higher or lower."

Because index formulas made it easy to project rosy numbers, the NAIC added Actuarial Guideline 49 in 2015. It was replaced by AG 49-A for policies sold on or after December 14, 2020, and AG 49-A has since been tightened twice. Here is what it does, in plain terms:

• A benchmark sets the ceiling. Each policy has a benchmark index account: annual point-to-point on the S&P 500, a 0% floor, 100% participation and the insurer's current cap. The insurer applies its current cap to every 25-year stretch of S&P 500 history in roughly the last 65 years and averages the results. The maximum illustrated rate for the benchmark is the lower of that average or 145% of the insurer's net investment earnings rate.
• Other accounts cannot illustrate higher just by being exotic. For policies sold on or after May 1, 2023 (the revision often called AG 49-B), every other index account is limited further, based on how its hedge budget compares with the benchmark's. In practice, an account cannot illustrate a higher rate than the benchmark just because it spends more on options, which mainly affects accounts with multipliers or bonuses.
• Loan arbitrage is capped. If an illustration shows a loan, the rate credited on the borrowed value may not exceed the loan interest rate by more than 0.50 percentage points.
• A lower-rate ledger is required. The illustration must show an "alternate scale" side by side with equal prominence, with index credits no higher than the lower of two rates: the maximum illustrated rate minus 1 percentage point, or the fixed account rate. On that scale a loan may not earn more than it costs.
• History is shown with a warning. For policies sold on or after April 1, 2026, the history table covers the most recent 25 years, other historical returns and side-by-side comparisons of history with the illustrated rate are not allowed, and the illustration must state that historical index changes are not indicative of future returns.

These rules make illustrations more comparable. They do not make them predictions. The maximum rate is still derived from strong past decades and the insurer's current cap, which can fall. Read the guaranteed column, the alternate scale and a run at a rate below both before you rely on any illustration. Learn more in AG 49 and IUL illustrations and how to read an IUL illustration.

After you buy, Model #582 requires an annual report on a policy sold with illustrations, and the insurer must give you an in-force illustration on request, showing projections from today's values. The model's notice says you can request one each year without charge. Request one every year or two.

Riders and living benefits

Riders add features, and many cost extra. The most common on IUL:

• Accelerated death benefits. Access part of the death benefit early if you are terminally, chronically or critically ill. Nationwide describes its terminal illness benefit as covering a life expectancy of 12 months or less, and on most of its policies it includes all three living benefits at no charge unless they are used. Payments reduce the death benefit, and many carriers charge for the benefit, or pay out less than the face amount, when you use it. See IUL living benefits.
• Long-term care riders. More structured than chronic illness riders, and usually an added cost (Nationwide, for example, offers its LTC rider for an additional cost).
• No-lapse guarantee. Keeps the death benefit in force for a set period if you pay a required premium, even if the cash value runs out. How long it lasts varies by policy and issue age, from a set number of years to a stated age. See no-lapse guarantee rider.
• Waiver of monthly deductions or waiver of premium. Covers charges or premiums if you become disabled.
• Overloan protection. Covered above.

Rider rules vary by carrier and state, and a living benefit rider is not a substitute for reading its claim conditions.

What IUL costs and how agents are paid

There is no single price for an IUL. What you pay depends on your age, health class, death benefit, premium, riders and the carrier's charges. The honest way to think about cost is in two parts: the insurance charges you need for the death benefit, and the sales and administrative costs that are heaviest in the early years. A well-designed illustration will show you both, year by year.

How agents are paid. The commission is paid by the insurance carrier, not by you as a separate fee. It is built into the policy's charges. It is based mainly on the target premium, a figure the carrier sets for each policy that generally rises with the death benefit. Premium paid above target earns a much smaller commission. One carrier's public prospectus supplement for a variable universal life policy (ReliaStar's FlexDesign VUL, 2005) showed the pattern: in the first policy year, up to 95% of premium up to target and 4% of premium above target, paid to the selling firm, with part going to the agent. IUL commission schedules are not generally filed publicly in that form, so we will not quote a figure for today's IUL market.

Why this matters to you: for a given premium, a larger death benefit usually means a larger target premium and a larger commission. A policy designed for maximum cash value, with the smallest death benefit the tax rules allow, usually pays the agent less. If you want to know what an agent will earn, ask. In New York, Regulation 194 requires producers to explain their role and how they are paid, and to disclose compensation amounts if you ask. Asking is reasonable in any state. Our own approach is on how we are paid, and more detail is in IUL commissions.

Who IUL fits

IUL tends to fit people who:

• Need a permanent death benefit, for a spouse, a special-needs child, estate liquidity or a business agreement, and want cash value too.
• Have already used cheaper tax-advantaged accounts. Nationwide's own guide for financial professionals says clients should generally use this strategy after fully using available tax-advantaged plans such as 401(k)s, IRAs and 529 plans. We agree.
• Can fund it steadily for 10 to 15 years or more. The design only works if premiums arrive as planned.
• Want some tax diversification. Retirement income from a mix of taxable, tax-deferred and policy loan sources gives more room to manage brackets later, as long as the policy is managed so it stays in force.
• Are business owners using life insurance for key person coverage, buy-sell funding or executive benefits. See IUL for business owners.
• Value a floor over maximum growth and accept a capped upside in exchange.

Who should not buy IUL

Be honest with yourself here. IUL is the wrong tool if you:

• Only need coverage for a set period, such as until the kids are grown or the mortgage is paid. Term insurance costs far less for the same death benefit.
• Have not captured a 401(k) match or funded an emergency reserve. Those come first.
• Might need the money within 10 years. Surrender charges and early costs make short holding periods expensive.
• Cannot commit to the planned premium. An underfunded IUL is the most common way these policies fail.
• Want full market returns. Caps, spreads and the missing dividends mean an IUL will not match an index fund in strong decades.
• Are relying on an illustration you cannot explain. If you cannot say what happens at a lower rate, you are not ready to buy.

See who should not buy IUL for more.

How IUL compares

Each of these has its own comparison page. The short version:

IUL vs whole life. Whole life has a fixed premium, guaranteed cash values, and possible dividends from a mutual insurer. IUL has a flexible premium, index-based crediting and fewer guarantees. Whole life is simpler and more predictable; IUL is more flexible and has more room to go right or wrong. See IUL vs whole life.

IUL vs term life. Term covers a set period, has no cash value and costs much less for the same death benefit. If protection is the only goal, term usually wins. See IUL vs term life and buy term and invest the difference.

IUL vs 401(k). A 401(k) offers a pre-tax or Roth contribution, often an employer match, and low-cost market funds, but has contribution limits and rules on access before retirement. IUL offers a death benefit and flexible access through loans, at the cost of insurance charges and capped returns. For most people the 401(k), at least up to the match, comes first. See IUL vs 401(k).

IUL vs Roth IRA. Both can provide retirement income without income tax. A Roth IRA does it by law, with low costs and full market exposure, but has income and contribution limits. IUL does it through loans that depend on keeping the policy in force. See IUL vs Roth IRA.

IUL vs fixed index annuity. Both use caps, participation rates and a 0% floor. A fixed index annuity has no cost of insurance and is built for accumulation and lifetime income; an IUL is built around a death benefit. If you do not need life insurance, an annuity is usually the cleaner tool. See IUL vs fixed index annuity.

How to buy an IUL well

The buying process matters as much as the product. What to insist on:

1. Start with the job. Is the priority the death benefit, cash value for later income, or both? The answer drives the design.
2. When cash value is the goal, fund it to the maximum. Use the smallest death benefit that keeps the policy within Section 7702 and under the MEC line, often with an increasing death benefit early. This lowers cost of insurance and commission and puts more of each premium to work. See max funded IUL.
3. Read the guaranteed column first. It shows what happens if charges rise to their maximums and credits stay at the floor. If the policy lapses early on guarantees, know when.
4. Insist on a lower-rate illustration. Look at the AG 49-A alternate scale and ask for a run at a rate below it, for example 1 to 2 percentage points under the illustrated rate. The plan should still work, perhaps with a lower income.
5. Stress test the loans. Ask to see the loan plan at a lower rate, and with a fixed loan instead of a participating one.
6. Check the carrier's in-force treatment. Ask how caps on existing policies have moved compared with caps for new buyers, and whether the carrier has ever raised cost of insurance charges on in-force policies. Our company reviews track this.
7. Check financial strength and the guaranty backstop. Favor strong ratings. Know your state's guaranty association limits: according to NOLHGA, most states cover up to $300,000 of death benefit and $100,000 of cash surrender value, and some states cover more.
8. Compare more than one carrier. Two policies with the same cap can differ widely in charges and loan terms.
9. Review every year. Request an in-force illustration, compare it with the original, and adjust premiums or loans early rather than late.

If you already own an IUL, a free policy review checks whether it is still on track. If you are shopping, our how to buy IUL guide walks through each step, and the IUL cash value calculator shows guaranteed, midpoint and illustrated outcomes side by side.

The bottom line

IUL is a flexible, permanent life insurance policy with an index-linked cash value. Its floor protects you from negative index credits, but not from its own charges. Its tax treatment is valuable, but only if the policy stays in force and out of MEC territory. Its illustrations are regulated, but they are still hypothetical.

For the right person, funded properly and managed every year, it can do something few other products do: provide a lifelong death benefit and a pool of cash you can borrow against without income tax. For the wrong person, or with the wrong design, it is an expensive way to buy insurance you did not need. The difference is almost always in the design and the discipline, which is why you should see the guaranteed column and a lower-rate illustration before anything is signed.