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IUL vs 401(k): which one fits your savings goal?

A 401(k) and an Indexed Universal Life (IUL) policy solve different problems. The 401(k) is a tax-advantaged retirement account tied to your employer; IUL is a permanent life insurance policy with a cash value linked to a market index like the S&P 500. Below we compare them on contributions, taxes, fees, and access.

How they work

A 401(k) is a defined-contribution retirement account offered by an employer. You contribute pre-tax (or Roth) dollars, choose from a fund menu, and your employer may match a portion of your contribution. Withdrawals before age 59½ usually trigger a 10% penalty plus income tax.

An Indexed Universal Life (IUL)policy is permanent life insurance. You pay premiums; part covers the cost of insurance and policy expenses, and the rest builds cash value. The cash value is credited based on the performance of an index (commonly the S&P 500), with a floor (typically 0%) that protects against down years and a cap or participation rate that limits upside.

Side-by-side

  • Contribution limits: 401(k) — $23,500 (2025 employee). IUL — no IRS contribution cap, but premiums must respect the policy's MEC limits to keep tax advantages.
  • Tax on growth: Both grow tax-deferred. Roth 401(k) and IUL cash value can be accessed tax-free if rules are followed (qualified distribution / policy loan).
  • Market risk: 401(k) follows your fund choices. IUL has a 0% floor and capped upside.
  • Fees: 401(k) — fund expense ratios (often 0.05–0.50%). IUL — cost of insurance + policy charges, often higher in early years.
  • Access before 59½: 401(k) — penalty + tax. IUL — tax-free policy loans against cash value.
  • Death benefit: 401(k) — none built in. IUL — pays a tax-free death benefit to beneficiaries.

When IUL makes sense alongside a 401(k)

IUL is most often considered after you have captured your full 401(k) match and built an emergency fund. Common reasons people add IUL: they want permanent life insurance for estate planning, they have already maxed their tax-advantaged accounts, or they want a portion of their long-term savings with downside protection and tax-free access.

It is rarely the right move to replace 401(k) contributions with IUL premiums while still in your accumulation years.

Run real numbers

AskIUL uses recent S&P 500 history to project conservative, base, and aggressive scenarios for monthly contributions over 1–40 years. Try $250/month for 20 years and compare what a 401(k)-style index fund would do versus an IUL-style capped allocation.

Try it now

Run a real S&P 500 projection and ask the AI advisor for a scenario tailored to your monthly contribution.

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FAQ

Is an IUL better than a 401(k)?+

Neither is universally better. A 401(k) usually wins on employer match, lower fees, and higher contribution limits. An IUL adds a death benefit, tax-free loans, and a downside floor. Many savers use both — first capture any 401(k) match, then consider IUL for life insurance plus indexed cash growth.

Can I roll a 401(k) into an IUL?+

Not directly. A 401(k) rollover normally goes to an IRA. You can withdraw or use 401(k) funds (subject to taxes/penalties) to fund an IUL premium, but that is rarely the right move for most savers. Talk to a fiduciary before any rollover-style move.

Do IULs have a market floor like a 401(k) does not?+

Yes. IUL crediting typically has a 0% floor — in a down year your indexed account doesn't lose value from market drops (fees still apply). A 401(k) invested in equities will follow the market down. The trade-off: IUL caps and participation rates limit your upside.

What are typical fees on an IUL vs 401(k)?+

401(k) fund expense ratios commonly fall between 0.05% and 0.50%. IUL costs include cost of insurance, premium loads, and policy expenses, often 1%–3%+ annually in early years, declining over time. Always request an in-force illustration to see real fees.

Related

IUL vs whole life→IUL pros and cons→IUL calculator→Compound interest calculator→How to get an IUL in your state→