IUL vs 401(k): run your own numbers.
A 401(k) is a retirement plan. An indexed universal life (IUL) policy is life insurance with cash value. Compare the same monthly contribution under your own assumptions, then read what the numbers leave out.
Published by CentraLife · Updated
The short answer
For most people with a workplace plan, the 401(k) comes first, especially any employer match, which adds money an IUL cannot. An IUL is life insurance, not a retirement account. It may be worth evaluating only after workplace and IRA options, when you also need permanent coverage, can fund it for many years, and accept its charges and lapse risk.
Compare the same contribution: hypothetical IUL or 401(k)
Choose what you would contribute each month and for how long. Both options get the same out-of-pocket dollars: the IUL side grows at the crediting rate you assume, the other at the market return you pick.
After tax if cashed out, end of year 25 (age 65)
Hypothetical IUL
$1,171,570
Before policy fees and charges
10.84% a year, scenario assumption (editable), not guaranteed
401(k) + brokerage
$914,839
8% a year, scenario assumption (editable), net of fund fees
Each option: $300,000 out of pocket.
Hypothetical and not guaranteed. This is not a quote or a policy illustration: it does not price age, health or underwriting, and it does not model policy loans, death benefits or retirement income. Both figures are after tax if cashed out. Unless you add policy costs under Advanced assumptions, the IUL figure is before fees and charges, which reduce real policy values. Taxes use the rates you choose.
Year 25: hypothetical IUL after tax $1,171,570 (Before policy fees and charges); 401(k) + brokerage after tax $914,839.
Advanced assumptionsAge, tax rates, 401(k) rules and policy costs
The numbers behind the result
| Option | Value | If cashed out | After tax if cashed out |
|---|---|---|---|
| Hypothetical IULBefore policy fees and charges | $1,417,397 | $1,417,397 | $1,171,570 |
| 401(k) + brokerage | $1,172,871 | $1,172,871 | $914,839 |
- IUL contributions
- $300,000
- Growth at the assumed rate
- $1,117,397
| 9.84% | 10.84% | 11.84% |
|---|---|---|
| $1,011,878 | $1,171,570 | $1,360,446 |
Assumptions and limits
- Educational comparison of how the same contributions could accumulate under the assumptions you select. It is not a quote, a policy illustration or personalized insurance pricing, and it does not model death benefits, policy loans, retirement income or required minimum distributions.
- IUL side: contributions grow at the assumed crediting rate, applied as an annual effective rate and compounded monthly (each month grows by (1 + rate)^(1/12)); the comparison account uses the same convention. A real IUL credits each index segment once a year. Actual indexed crediting depends on index results, caps, participation rates and floors, changes from year to year, can be 0% in some years and is not guaranteed.
- Both default rates are scenario assumptions you can change, applied as annual effective rates. Neither is a forecast or an expected policy or fund return. Where the defaults come from: 10.84% is the highest 10-year figure displayed in an independent product-research platform’s IUL backtest list, viewed October 16, 2026 (current crediting terms applied to past index movements, before policy charges). The platform does not publish its method, including whether the figure is a compound or an average annual return, so 10.84% is not a verified historical compound return. The default market return of 8% a year is an assumption, not a measured return. The 13.7% option is the S&P 500’s 10-year annualized price return, excluding dividends, from the same platform’s index screen on October 16, 2026 (Chartrow reports 13.78% for October 17, 2016 to October 15, 2026); past returns do not predict future returns.
- Unless you enter an assumed-cost adjustment, IUL results are before policy fees and charges. Real policies deduct charges such as cost of insurance, premium charges, administrative fees and surrender charges, which reduce values. The comparison account’s return is after fund fees.
- Assumed-cost adjustment: a charge on each contribution, a fixed monthly fee (it continues after contributions stop) and an annual charge on the value. These are your assumptions, not any insurer’s charges. If the costs use up the value, the policy side shows that year, and later contributions are shown separately without growth.
- Age changes only the comparison account’s tax rules and how far the comparison runs. Real insurance costs and the coverage available depend on age, health and underwriting, which this calculator does not price.
- IUL after tax: the value, with any gain above contributions taxed as ordinary income at your later tax rate. No modified endowment contract (MEC) test is performed; a policy taxed as a MEC would be treated differently.
- Comparison account: it receives the same out-of-pocket contributions on the same monthly schedule, growing at the selected market return after fund fees. That rate is an assumption, not a forecast.
- A traditional 401(k) deferral costs (1 − your current tax rate) of its amount; Roth deferrals and Roth IRA contributions cost their full amount. 2026 IRS limits are assumed to stay the same in later years; actual limits change. Catch-ups apply once your age makes them certain. Catch-ups are modelled as Roth when you choose Roth deferrals or answer yes to the prior-year-wages question (over $150,000 from this employer); otherwise they are pre-tax. The model assumes your plan offers a Roth option. Employer match is included only if you choose it, and only on pay up to $360,000.
- Account after tax: pre-tax money is taxed, plus 10% before age 59½; Roth earnings are taxed (plus 10% before age 59½) until the 5-year rule, counted from the first contribution in this comparison, and age 59½ are both met; brokerage gains are taxed at the capital-gains rate, or at your later tax rate on deposits held a year or less. State taxes, Social Security taxation and Medicare premiums are not modelled. The comparison stops before required minimum distributions could begin.
IUL vs 401(k), side by side
| Feature | Indexed universal life (IUL) | 401(k) |
|---|---|---|
| What it is | Permanent life insurance with a death benefit and cash value. Interest is credited by a formula linked to an index; the cash value is not invested in the index.[11][18] | An employer-sponsored retirement plan. You choose investments from the plan’s menu.[5] |
| Money going in | After-tax premiums. The amount is limited by underwriting, affordability and the policy’s tax-law limits.[11][12] | Pre-tax deferrals, or Roth deferrals if the plan offers them. 2026 employee limit: $24,500. Employee and employer contributions together are generally limited to $72,000 (2026 overall limit).[1][2] |
| Catch-up contributions | Not applicable. | 2026: an extra $8,000 at age 50+, or $11,250 at ages 60–63 if the plan allows. Employees whose 2025 FICA wages from the employer exceeded $150,000 must make catch-ups as Roth.[1][2][3] |
| Employer money | None. | Matching contributions if the plan provides them, which may be subject to the plan’s vesting schedule. Your own deferrals are always fully vested.[4] |
| Market downside | Index credits usually have a floor (often 0%), but cost of insurance and other charges are still deducted, so cash value can fall in a zero-credit year.[18][16] | The account rises and falls with the investments you choose, including market losses. |
| Upside | Credits are limited by caps, participation rates or spreads. These are non-guaranteed and can change within the contract’s limits.[17][18] | Not capped. Results depend on investment returns minus fund and plan fees. |
| Costs | Cost-of-insurance and other policy charges are deducted from cash value. Cost of insurance depends partly on age, so it generally rises as the insured gets older; surrender charges and low early cash values make the first years expensive to leave.[16][17] | Fund expense ratios and plan administrative fees. |
| Taxes while invested | Growth inside a contract that qualifies as life insurance is not taxed while it stays in the policy.[11][13] | Not taxed while in the plan.[5] |
| Taxes on money out | If the policy is not a modified endowment contract (MEC): withdrawals are generally taxed only above your investment in the contract (withdrawals that reduce benefits in the first 15 years can be taxed sooner), and loans are generally not taxed while the policy stays in force. If it is a MEC: loans and withdrawals are taxed gain-first.[13][11][12] | Pre-tax amounts are taxable income when distributed. Qualified distributions from a designated Roth account are not included in income.[5][6] |
| Access before 59½ | No age-based penalty on non-MEC loans or basis withdrawals. A taxable MEC distribution before 59½ generally adds a 10% tax. Surrender charges can apply at any age.[13] | Generally a 10% additional tax on early distributions unless an exception applies (for example, leaving the employer in or after the year you turn 55). Plan loans, if the plan offers them, are limited and must be repaid on schedule.[7][8] |
| Required minimum distributions | Required-minimum-distribution rules apply to the retirement plans and IRAs the IRS lists, such as 401(k), 403(b) and 457(b) plans and traditional IRAs. A life insurance policy you own outside a retirement plan is not on that list.[9][19] | Pre-tax balances: from age 73 if born 1951–1958, or 75 if born 1960 or later; confirm the age for 1959 births. Usually deferred while still working there unless a 5% owner. Designated Roth accounts: none while the owner is alive. A missed RMD can trigger a 25% excise tax on the shortfall. The rate drops to 10% if, within the correction window, you take the missed amount from the same plan and file a return reflecting the tax; the window ends on the last day of the second taxable year beginning after the year the tax is imposed, or earlier if the IRS mails a notice of deficiency or assesses the tax. Separately, the IRS may waive the tax if the shortfall was due to reasonable error and reasonable steps are being taken to fix it.[10][9][20] |
| If things go wrong | If cash value cannot cover charges and loan interest, the policy can lapse. A lapse or surrender with a loan outstanding can be treated like a surrender for cash: the unpaid loan can count toward what you received, which can create taxable income even though no cash is paid out.[16][15] | Market losses reduce the balance. A plan loan not repaid on schedule becomes a taxable distribution.[8] |
| At death | Death benefit is generally income-tax-free to beneficiaries (exceptions apply, such as a policy transferred for value). Unpaid loans reduce it.[15][14][16] | The balance passes to your beneficiaries, who follow the plan’s distribution rules; pre-tax amounts are taxable to them when distributed.[9][5] |
Figures are for 2026 unless stated.
Who an IUL may fit, and who it usually does not
An IUL may be worth evaluating if:
- You already contribute enough to get any employer match and have considered your other 401(k) and IRA options.
- You need permanent life insurance in addition to long-term savings.
- You can pay the planned premium for many years, because early cash values are low and surrender charges apply.
- You keep emergency savings outside the policy.
- You will review annual statements, in-force illustrations and any loan balance.
It usually does not fit if:
- You are not yet capturing an available employer match.
- You do not need life insurance, or only need it for a set number of years.
- You may need the money within the next several years or might stop paying premiums.
- The case rests on a high illustrated rate or a promise that you “can’t lose.”
- You plan to borrow heavily from the policy without monitoring it.
If one of these describes you, an IUL consultation is probably not the right next step; your workplace plan and IRA options usually come first.
Which to fund first: questions to settle
- Is there an employer match, and what is the plan’s vesting schedule?
- Do you need life insurance at all, and for how long?
- Have you used the other tax-advantaged room you are eligible for, such as more 401(k) deferrals or an IRA?
- Do you expect your tax rate in retirement to be higher or lower than today? That shapes pre-tax versus after-tax savings.
- Can you commit to the premium for many years and still keep an emergency reserve?
- Have you compared a carrier illustration’s guaranteed and non-guaranteed columns, including a lower-crediting scenario?
These are general questions, not a recommendation for your situation. The order that fits you depends on your income, taxes, health, coverage needs and how long you can keep funding each option.
How an IUL strategy can go wrong
Charges continue when the index credits nothing.
The floor limits the index credit, not the cash value. Cost of insurance and other charges are deducted every month, so a flat or negative index year can still reduce the cash value.[16]
Non-guaranteed terms can move against you.
Caps, participation rates and many charges are not guaranteed. If they become less favorable, the same premium buys less growth, and you may need to pay more to keep the planned result or keep the policy in force.[17]
Underfunding or stopping premiums can end the policy.
Paying less than the design assumes leaves charges to be taken from cash value. If the cash value reaches zero, the policy can lapse.[16]
Loans can turn into a tax bill.
Loan interest accrues while charges continue. If the loan balance and charges use up the cash value, the policy can lapse. A lapse or surrender with a loan outstanding can be treated like a surrender for cash, so the unpaid loan can create taxable income without any cash to pay the tax.[15][13]
Funding too fast can make it a MEC.
Premiums above the 7-pay limit turn the policy into a modified endowment contract. Loans and withdrawals are then taxed gain-first, and taxable amounts taken before 59½ generally carry an extra 10% tax.[12][13]
Leaving early is expensive.
Cash values are often low in the early years and surrender charges may apply, so quitting in the first years can return less than you paid in.[16][17]
An illustration is not a promise.
Carrier illustrations of current IUL policies generally must follow NAIC Actuarial Guideline 49-A, which limits the crediting rate and loan leverage an illustration can show, but the illustrated values remain non-guaranteed.[18]
What can change the answer
- The size and vesting of your employer match.
- Your current tax rate compared with your expected rate in retirement.
- Your age, health and underwriting class, which drive the cost of insurance.
- Policy design: death benefit relative to premium, and funding pace relative to the MEC limit.
- Actual caps, participation rates and charges over time, compared with the illustration.
- How long you fund and keep the policy.
- Your plan’s features: Roth option, fees and loan provisions.
- Whether you compare equal take-home budgets: a pre-tax 401(k) deferral and an after-tax premium of the same size do not cost the same out of your paycheck.
- Changes in tax law.
Questions to ask before buying an IUL
- At what age does the policy lapse on the guaranteed column, with the premium I plan to pay?
- What are the cost of insurance, premium load, administrative and rider charges each year?
- What are the surrender charges, and for how many years do they apply?
- What crediting rate does the illustration use, and what happens if credits come in lower?
- What are the current cap and participation rate, and what minimums does the contract guarantee?
- How close is my planned premium to the 7-pay (MEC) limit, and who monitors it?
- What loan type and loan interest rate are assumed, and at what loan level will I be warned?
- What happens if I reduce, skip or stop premiums?
- Will I receive an annual statement and an in-force illustration, and who reviews them with me?
IUL vs 401(k): common questions
Can an IUL replace a 401(k)?
Not as a like-for-like substitute. A 401(k) is a retirement plan that may include employer contributions and has its own tax rules. An IUL is a life insurance contract whose cash value can be accessed under conditions. For someone who also needs permanent coverage, an IUL may complement workplace savings; it does not replace an employer match or the plan’s tax treatment.
Can I contribute to a 401(k) and also own an IUL?
Yes. They are separate arrangements: a 401(k) depends on your employer’s plan and its eligibility rules, and an IUL depends on underwriting and affordability. How much to put into each depends on your situation, including whether your employer matches contributions and on what vesting schedule, the plan’s investment and administrative costs, your current and expected tax rates, how soon you may need the money, and whether you need permanent life insurance at all.
How does a Roth 401(k) compare with an IUL for tax diversification?
If your employer’s plan offers designated Roth contributions, that is one option to compare. The IRS sets no income limit on designated Roth contributions, and a qualified distribution from a designated Roth account is not included in income; it generally requires a 5-taxable-year period of participation and age 59½, disability or death. Designated Roth accounts have no required distributions while the owner is alive. An IUL is life insurance with a death benefit. For policy loans and withdrawals: if the policy is not a modified endowment contract (MEC), withdrawals are generally taxed only above your investment in the contract (withdrawals that reduce benefits in the first 15 years can be taxed sooner), and loans are generally not taxed while the policy stays in force; a lapse or surrender with a loan outstanding can create taxable income. If it is a MEC, loans and withdrawals are taxed gain-first. Which mix fits depends on any employer match, plan costs, your current and expected tax rates, how soon you may need the money, and whether you need permanent coverage.
What are the main downsides of an IUL?
Policy charges that continue for life (cost of insurance generally rises with age), low early cash values and surrender charges if you leave early, index credits limited by caps and participation rates that can change, and the risk of lapse if premiums, charges and loans are not managed. It is also more complex than a retirement account and needs ongoing review.
Can you lose money in an IUL even with a 0% floor?
Yes. The floor applies to the index credit, not to your cash value. Cost of insurance and other charges are deducted regardless of the credit, so the cash value can decline in a year with a zero credit, and more quickly if charges rise or premiums stop. Early surrender charges can also return less than you paid in.
Is IUL cash value growth really tax-free?
Growth is not taxed while it stays inside a contract that qualifies as life insurance. Getting money out tax-free depends on conditions: the policy must not be a modified endowment contract, withdrawals are tax-free only up to your investment in the contract, and loans are generally not taxed while the policy stays in force. A lapse or surrender with a loan outstanding can create taxable income. “Tax-free income” is shorthand for these conditions, not a guarantee.
When do 401(k) required minimum distributions start?
For pre-tax 401(k) balances, at age 73 if you were born 1951–1958 and age 75 if you were born in 1960 or later; confirm the age for 1959 births with current IRS guidance. If you are still working for the plan sponsor and are not a 5% owner, the plan can let you wait until you retire. Designated Roth accounts have no required distributions while the owner is alive. If a required distribution is missed, the shortfall is subject to a 25% excise tax. It is reduced to 10% if, within the correction window, you receive the missed amount from the same plan and submit a return reflecting the tax. That window ends on the last day of the second taxable year beginning after the year the tax is imposed, or earlier if the IRS mails a notice of deficiency or assesses the tax. Separately, the IRS may waive the tax if you show the shortfall was due to reasonable error and that reasonable steps are being taken to remedy it; a waiver is not automatic, and the IRS says to request it on Form 5329 with a letter of explanation.
What are the 2026 401(k) contribution limits?
The employee deferral limit is $24,500. People age 50 or older can generally add $8,000, or $11,250 at ages 60–63 if the plan allows. Employees whose 2025 FICA wages from the employer exceeded $150,000 must make catch-up contributions as Roth contributions. The IRS adjusts these amounts each year.
Sources
- 1.IRS: 401(k) limit increases to $24,500 for 2026, IRA limit increases to $7,500 (IR-2025-111, Nov. 13, 2025)
- 2.IRS: Notice 2025-67: 2026 amounts relating to retirement plans and IRAs (incl. the Roth catch-up wage threshold)
- 3.IRS: Final regulations on the Roth catch-up rule and other SECURE 2.0 provisions (IR-2025-91, Sept. 15, 2025)
- 4.IRS: Retirement topics: Vesting
- 5.IRS: 401(k) resource guide: Plan participants, general distribution rules
- 6.IRS: Retirement plans FAQs on designated Roth accounts
- 7.IRS: Retirement topics: Exceptions to tax on early distributions
- 8.IRS: Retirement topics: Plan loans
- 9.IRS: Retirement plan and IRA required minimum distributions FAQs
- 10.Treasury / IRS: Required Minimum Distributions, final regulations (T.D. 10001), Federal Register, July 19, 2024
- 11.U.S. Code (Cornell LII): 26 U.S.C. §7702: Life insurance contract defined
- 12.U.S. Code (Cornell LII): 26 U.S.C. §7702A: Modified endowment contract defined (the 7-pay test)
- 13.U.S. Code (Cornell LII): 26 U.S.C. §72: Annuities; certain proceeds of endowment and life insurance contracts (incl. §72(e) and §72(v))
- 14.U.S. Code (Cornell LII): 26 U.S.C. §101: Certain death benefits
- 15.IRS: Publication 525, Taxable and Nontaxable Income (life insurance proceeds; surrender of policy for cash)
- 16.Texas Department of Insurance: Life insurance guide (universal life, cash value and lapse)
- 17.National Association of Insurance Commissioners: Life Insurance Buyer’s Guide
- 18.National Association of Insurance Commissioners: Actuarial Guideline XLIX-A: illustrations of policies with index-based interest (revised; adopted Dec. 11, 2025)
- 19.IRS: Retirement topics: Required minimum distributions (RMDs) (accessed Oct. 20, 2026)
- 20.U.S. Code (Cornell LII): 26 U.S.C. §4974: Excise tax on certain accumulations in qualified retirement plans (accessed Oct. 20, 2026)
Sources accessed . Limits and thresholds change each year; check the IRS pages for current figures.
Related guides
IUL vs Roth IRA
Compare limits, costs, access rules and tax treatment against the Roth IRA.
Max-funded IUL and the MEC line
How the 7-pay test limits funding pace and what MEC status changes.
How policy loans work
Collateral, loan interest, loan types and the tax treatment of non-MEC loans.
IUL lapse risk with policy loans
How loan-heavy policies lapse and how to monitor them.
What IUL really earns
Caps, participation rates and charges compared with illustrated returns.
IUL stress test
See how lower crediting and higher charges change a simplified policy path.
General rules set the questions.
A carrier illustration shows the actual policy terms.
A licensed CentraLife advisor can run an actual carrier illustration, with its current caps and charges and its guaranteed column, and compare it with your current plan. No cost, no obligation.
Educational information only, not individualized tax, legal or investment advice. CentraLife is an independent insurance agency and does not provide tax preparation or legal services. Indexed universal life insurance is a life insurance contract, not a retirement account or a direct market investment; the policy contract and the insurer’s rules control. Caps, participation rates and many charges are not guaranteed and can change within contract limits, and illustrated values are not guaranteed. Tax treatment depends on the policy staying in force and not becoming a modified endowment contract, and on current law, which can change. Contribution limits, income thresholds and distribution rules are set by the IRS and change over time; confirm current figures at irs.gov and with your tax professional. Calculator results are hypothetical and are not a quote or a carrier illustration. CentraLife LLC · NPN 21105331.