IUL vs 401(k): An Honest 2026 Comparison

IUL vs 401(k) at a glance

The 2026 dollar figures come from the IRS announcement of 2026 limits and IRS Notice 2025-67. We explain each row below.

The standard advice: take the full match first

Almost every serious guide to retirement saving starts in the same place, and so do we. If your employer matches your 401(k) contributions, put in at least enough to collect the whole match before you send a dollar anywhere else, including to a life insurance policy.

The reason is simple arithmetic. If your plan matches 50 cents on the dollar, every dollar that earns the match turns into $1.50 the day it lands, before any investment return. A dollar-for-dollar match doubles it. No insurance policy, annuity or fund can promise anything close to that, and an IUL can't either.

Two details to check in your own plan:

• The formula. Plans match in different ways, for example a percentage of what you contribute up to a percentage of your pay. Your plan's summary plan description spells it out.
• Vesting. Employer contributions can vest over several years. Leave before you are vested and you can lose part of the match. Your own contributions are always yours.

Anyone who suggests cutting your 401(k) below the match to pay IUL premiums is asking you to give up a sure thing for a set of non-guaranteed ones. Say no.

How a 401(k) works in 2026

A 401(k) lets you defer part of each paycheck into a plan account and choose investments from the plan's menu. Many plans offer low-cost index funds, which is one of the plan's biggest strengths.

The 2026 limits, per the IRS:

• You can defer up to $24,500 of your pay.
• If you are 50 or older, you can add a catch-up of $8,000, for $32,500 in total.
• If you turn 60, 61, 62 or 63 in 2026, the catch-up is $11,250 instead, for $35,750 in total.
• Your deferrals plus employer contributions can reach $72,000 for the year (the Section 415(c) limit), not counting catch-ups.
• Starting in 2026: if your FICA wages from the employer sponsoring the plan were over $150,000 in 2025, your catch-up contributions must go in as Roth.

Taxes. Traditional deferrals lower your taxable income today, then every dollar you take out later is taxed as ordinary income. Roth 401(k) deferrals go in after tax, and qualified withdrawals come out tax-free. There is no income limit on contributing to either kind, unlike a Roth IRA.

Getting money out early. Withdrawals before age 59 and a half usually carry a 10% additional tax on top of income tax, with some exceptions the IRS lists. Many plans allow loans: the most a plan can lend you is half your vested balance or $50,000, whichever is less, with a $10,000 floor where the plan allows it.

Fees. Plan and fund fees are real, and they compound. The Department of Labor's own example: a $25,000 balance earning 7% a year for 35 years grows to about $227,000 with 0.5% in fees, but only about $163,000 with 1.5% in fees. That one-point difference cuts the ending balance by 28%. The same lesson applies to an IUL, where charges are part of the design.

How an IUL works as a retirement tool

An indexed universal life policy is permanent life insurance. You pay premiums. The carrier takes out a premium charge, then each month deducts the cost of insurance and other policy charges from your account. What is left is the cash value.

You choose how the cash value is credited. A fixed account pays a declared rate. Index accounts credit interest based on how an index such as the S&P 500 moved over a period, usually one year:

• A floor, usually 0%, means a falling index credits zero rather than a loss. The floor protects the index credit, not your cash value. In a 0% year, the monthly charges still come out, so the cash value goes down.
• A cap limits the credit in a good year. If the cap is 10% and the index gains 25%, you get 10%. Our IUL cap rates guide explains how caps are set and why they change.
• A participation rate sets what share of the index gain counts. Some accounts use a spread instead.
• The index return used is usually the price change only, without dividends.

You never own the index or any stocks. The carrier credits interest by formula. That is why IUL is life insurance and not a way to hold the market.

The policy has to be built for cash value. A policy designed for retirement income is usually funded with as much premium as the tax code allows for the smallest death benefit that works. People call this a max-funded IUL. Section 7702 of the tax code limits how much premium or cash value a policy can hold, relative to its death benefit, and still count as life insurance. Section 7702A adds the 7-pay test: pay in too much in the first seven years and the policy becomes a modified endowment contract, which loses the loan tax treatment described next.

How IUL retirement income works: loans, with conditions

This is the part sales pitches rush through. It deserves the most care.

Most IUL retirement income comes from policy loans. You borrow from the carrier, and your cash value is the collateral. Under Section 72(e) of the tax code, a loan from a policy that is not a MEC is not a taxable distribution. You can also generally withdraw up to your basis, meaning the premiums you paid, without tax. After that, withdrawals are taxable, which is why loans do most of the work.

Here is what has to stay true for that income to remain tax-free:

1. The policy must stay in force until you die. Loans are settled out of the death benefit. If the policy lapses or you surrender it with a loan outstanding, the loan is treated as paid off with your cash value. Any amount above your basis becomes taxable income that year, even though you get no cash. For someone who has borrowed for years, that tax bill can be large.
2. The policy must not be a MEC. If it is, loans and withdrawals are taxed as gains first, and before 59 and a half they also carry a 10% additional tax under Section 72(v).
3. The loan cannot outgrow the cash value. Loan interest accrues every year. If credits come in low, charges rise with age and the loan keeps compounding, the policy can run out of cash value and lapse. Some policies offer an overloan protection rider that can lock the policy in place near that point, under strict conditions and sometimes for a fee.

Loan types matter too. A fixed or standard loan charges a set rate and credits the borrowed portion at a related rate. A variable or indexed loan leaves the borrowed cash value in the index account, so in a good year you can earn more than the loan costs, and in a 0% year you pay loan interest with nothing credited against it. Regulators limit how rosy this can look on paper: under the NAIC's Actuarial Guideline 49-A, an illustration cannot show the borrowed money earning more than 0.5 percentage points above the loan interest rate. Our IUL policy loans guide covers each loan type in depth.

A 401(k) has fewer moving parts. Withdrawals are taxed as you take them. Its loan risk is smaller and more predictable: a plan loan you don't repay on schedule is treated as a taxable distribution of the unpaid balance, with the 10% additional tax if you are under 59 and a half, and plan loans are capped at $50,000.

Required minimum distributions and SECURE 2.0

A traditional 401(k) makes you start taking money out eventually. The SECURE 2.0 Act raised the starting age. Under the final IRS regulations published in July 2024, the age is 73 if you were born from 1951 through 1958, and 75 if you were born in 1960 or later. If you are still working and don't own more than 5% of the company, your plan may let you wait until you retire. Miss a required distribution and the IRS excise tax is 25% of the shortfall, cut to 10% if you correct it within two years.

Two points keep this fair:

• Roth 401(k) accounts no longer have required distributions during the owner's life, starting in 2024. The IRS confirms this. So "no RMDs" is not an IUL-only feature anymore.
• IUL has no required distributions at all. Cash value can stay in the policy as long as the policy is in force, and you choose when to borrow.

RMDs matter most to people who will not need all of their traditional 401(k) money and don't want forced taxable income in their 70s. For a worker who will spend the account anyway, they matter much less.

Where the 401(k) wins

• The match. Free money on the dollars that earn it. An IUL has nothing like it.
• Cost. Index funds in a well-run plan are cheap. An IUL typically carries a premium charge, the cost of insurance, policy fees, per-thousand charges on the face amount, rider charges and surrender charges. You pay for the death benefit whether or not you wanted one.
• Simplicity. You choose a percentage of pay and a fund. No underwriting, no loan management, no annual policy review.
• Full market upside. No cap. Over long periods, that matters. You also carry the full downside.
• Creditor protection. ERISA requires qualified plans to bar assignment of benefits, and in Patterson v. Shumate the Supreme Court held that an ERISA-qualified plan interest is excluded from a bankruptcy estate. Protection for life insurance cash value depends on state law, and it ranges from broad to limited.
• Flexibility when life changes. You can stop contributing in a hard year with no penalty. Underfunding an IUL can lead to a lapse.

Where an IUL can add something

For the right person, and after the 401(k) basics are covered, an IUL can add real value:

• Tax diversification. Retirees who have only pre-tax savings have little control over their taxable income. A policy that can supply loan-based income, under the conditions above, adds a third pool beside pre-tax and Roth money.
• No required distributions, and loans available at any age without the 59 and a half rule. Early years still carry surrender charges.
• No income limit and no IRS dollar cap. The limit is tied to the death benefit and your insurability, not to your salary or a yearly number.
• A death benefit. If your family needs life insurance anyway, one policy can do two jobs. The death benefit is generally paid free of federal income tax under Section 101.
• A 0% floor on index credits. A market crash in the year before you retire cannot produce a negative index credit. Charges still apply.
• Living benefit riders, on many policies, that can advance part of the death benefit for a qualifying chronic, critical or terminal illness.

What an IUL costs you

Be clear-eyed about the price of those features:

• Insurance charges come out every month, and the cost of insurance per $1,000 rises as you age.
• Surrender charges apply for a set number of years that varies by policy. Cancel early and you can get back less than you paid in. Your illustration shows the schedule.
• Non-guaranteed elements. Caps, participation rates and most charges can change after you buy, within the guaranteed limits in the contract. A cap that is attractive today can be cut later.
• Lapse risk. Underfunding, heavy borrowing, or a string of low-credit years can cause a lapse, and a lapse with a loan can create taxable income.
• Complexity. Comparing two policies well takes time. Many people who buy an IUL never learn how their own loan works.

A hypothetical example

This example is hypothetical. The person, the plan design and the figures are made up to show mechanics. It is not an illustration of any policy and makes no projection of IUL values.

Dana is 45, single, and earns $180,000 a year. Her employer's plan matches 50 cents per dollar on contributions up to 6% of pay.

Step 1, the match. Dana contributes 6% of pay, or $10,800. The plan adds $5,400. That first $10,800 gets a 50% boost on day one.

Step 2, the rest of the 401(k). In 2026 she can defer up to $24,500, so she has $13,700 of room left. Her plan offers a Roth 401(k), so she weighs pre-tax against Roth for that room. Her $180,000 salary is above the $168,000 point where a single filer's direct Roth IRA contribution phases out in 2026. The test uses modified adjusted gross income, which pre-tax deferrals lower, so the answer depends on her choices, but a direct Roth IRA may be out of reach while the Roth 401(k) is available at any income.

Step 3, what's left. If Dana still has money to save after filling the 401(k), and she also has a real need for permanent life insurance, an IUL enters the conversation. Here is what she should expect from the mechanics, without any dollar projection:

• In the first years, the policy's surrender value is usually below the premiums paid, because charges and surrender charges are highest early. How many years it takes to catch up depends on age, health, design and credits.
• Each year's index credit will land somewhere between the floor and the cap. Some years will be 0%.
• The illustration the carrier shows her will use a rate no higher than the AG 49-A maximum. She should also ask to see it run at a lower rate, such as 4% or 5%, and at the guaranteed values.
• The policy must be funded under the 7-pay limit so it doesn't become a MEC.
• Any future loan income depends on the policy staying in force for life, so she should plan to review it every year.

Step 4, compare honestly. Dana's alternative for extra savings is a taxable brokerage account in low-cost index funds. It has no death benefit and no loan-based tax treatment, but no insurance charges either. The right answer depends on whether she needs the insurance, how steady her income is, and how long she can keep funding the policy.

Our planned IUL vs 401(k) calculator will let you run your own numbers side by side.

Who each fits

Put the 401(k) first if you:

• Have an employer match you are not fully collecting.
• Have not yet built an emergency fund or paid off high-interest debt.
• Don't need permanent life insurance, or already have enough term coverage.
• Might need to stop saving in a bad year.
• Want the lowest-cost path to market growth.

An IUL may fit, after the 401(k), if you:

• Already collect the full match and ideally fill the rest of your 401(k).
• Have a lasting need for life insurance, such as a family, a business or an estate.
• Can fund a policy steadily for many years, near the tax code's limits.
• Are a higher earner who wants a source of retirement income beyond pre-tax and Roth accounts.
• Will read your annual statement and review the policy, especially once loans begin.

Skip the IUL if you need the money within the surrender period, can't commit to steady premiums, or are buying it mainly because an illustration looked better than your 401(k). Illustrations are hypothetical, and the 401(k) match is not.

Want a second opinion on a policy you already own or have been shown? Our policy review is free. And if Roth savings are the real question, read IUL vs Roth IRA and our IUL taxes guide.