Indexed universal life, explained.
An IUL is permanent life insurance with a cash value account that grows along with a market index, like the S&P 500 — with a floor underneath it. In a down year the floor holds your cash value steady; in an up year you’re credited up to a set cap. The death benefit passes to your family income-tax-free.
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How it works
Three moving parts, in plain English.
An IUL has a cash value account, an index it follows, and two dials that shape the growth. Once you see the three parts, the whole product makes sense.
The floor
A built-in minimum, usually 0%. When the index has a losing year, the floor holds your cash value where it is — index losses don’t come out of what you’ve built.
The cap
The trade for that floor. In an up year you’re credited the index’s gain up to a cap or participation rate the policy sets — strong years are shared, not unlimited.
The cash value
What grows over time. It’s tax-deferred while it sits in the policy, and you can borrow against it later — a feature that rewards a policy funded the way it was designed.
Cash value grows tax-deferred under IRC §7702, the part of the tax code that defines life insurance. Caps and participation rates vary by policy and can change over time — an illustration shows how a design behaves, not what it will earn.
Not sure how yours is set up? A licensed professional will read your IUL with you and tell you plainly. Free, no obligation.
Call (888) 959-0710What it’s good at
Where a well-built IUL earns its place.
Tax-advantaged growth
Cash value compounds tax-deferred, and the death benefit reaches your family income-tax-free — a combination few accounts offer.
A floor under bad years
The 0% floor means a market drop doesn’t erase index gains you’ve already locked in. You trade some upside for that steadiness.
Premiums that flex
Within limits, you can adjust what you pay as life changes — useful for income that isn’t the same every year.
Living benefits
Many policies let you access part of the death benefit early for a qualifying chronic or terminal illness.
No contribution ceiling
Unlike a Roth IRA, an IUL has no IRS income limit to participate — one reason higher earners look at it after maxing other accounts.
A legacy that’s certain
Structured and funded properly, it pairs lifelong coverage with a cash value you can use along the way.
Is an IUL a good fit?
The design is everything. Here’s the honest version.
The short version: an IUL is a strong product when it’s funded and structured the way it’s meant to be. Most of the criticism you’ll read is fair — about under-funded policies, where too little premium went in for the design to do its job. That’s a funding problem, not a flaw in the product.
A good fit usually looks like this: you already have your employer match and other tax-advantaged accounts working, you want permanent coverage, and you can fund the policy steadily for the long haul. Get those right and an IUL does exactly what it’s built to do.
The question isn’t whether IULs are good or bad. It’s whether yours is funded the way it was drawn up. That’s a ten-minute conversation, and it’s free.
Go deeper
IUL guides, written in plain English.
IUL · 14 min
Max-Funded IUL: How It Works & How to Check Yours
What max funding actually means, the IRS limits that shape it, who it fits — and the part other guides skip: how to find out whether your existing IUL is funded to its design.
Read the guideIUL · 11 min
IUL vs 401(k): How They Work Together for Retirement
An IUL and a 401(k) do different jobs. Capture your full employer match first — then an IUL can add tax diversification and a floor against market losses.
Read the guideIUL · 13 min
IUL vs Roth IRA: How They Differ & Which Fits
Both grow tax-advantaged under different rules. Compare limits, income caps, the market floor, and who fits which — with the honest order of operations.
Read the guideIUL · 11 min
What Is the Infinite Banking Concept? How It Really Works
Using a properly designed, high-cash-value permanent life policy as your own financing system. How it works, where it fits, and the honest caveats.
Read the guideIUL · 9 min
What Is Velocity Banking? How It Works & the Catch
A debt-payoff strategy that uses a line of credit to attack mortgage principal. The steps, the trade-offs, and how it differs from infinite banking.
Read the guideIUL · 9 min
Paid-Up Additions (PUAs): How They Grow a Policy
A PUA buys extra, fully paid-up whole life that adds death benefit and cash value — the key tool behind max-funding and infinite banking. How it works, and the MEC line.
Read the guideIUL · 8 min
Becoming Your Own Banker: The Concept, Explained
R. Nelson Nash’s idea behind infinite banking — building capital inside a permanent life policy and financing through it. The philosophy, and what it really asks of you.
Read the guideIUL · 12 min
Is an IUL a Good Investment? An Honest Look
Whether an IUL is a good investment depends on its design and funding. The fair critiques taken seriously, how a properly funded policy works, and who it fits.
Read the guideIUL · 12 min
IUL vs Whole Life: How They Differ & Which One Fits
IUL vs whole life, compared plainly: how each builds cash value, what the guarantees and caps mean, what each costs, and which job each one is built for.
Read the guideIUL · 11 min
Penn Mutual IUL Review: Design & Strengths
Penn Mutual indexed universal life from an 1847 mutual insurer with top financial-strength ratings. How the Accumulation Builder design works and who it fits.
Read the guideIUL · 10 min
Modified Endowment Contract (MEC): What It Means
A modified endowment contract (MEC) is a life policy overfunded past the IRS 7-pay limit, which changes how withdrawals are taxed. What triggers a MEC, and how to avoid one.
Read the guideIUL · 11 min
IUL Cap Rate & Participation Rate, Explained
An IUL cap rate limits how much index gain your policy credits; the participation rate sets the share you get. How caps, floors, and par rates shape IUL returns.
Read the guideAlready own one?
A free check on how yours is funded.
If you have an IUL already, a review answers the one question that matters: is it funded and designed to do its job? A licensed professional reads the policy with you, benchmarks how the cash value is actually performing, and tells you plainly.
Plenty of the policies we read are working exactly as designed — and when that’s the case, we tell you to keep doing what you’re doing. A review that ends in “you’re in good shape” is a successful review.
Free · no obligation · Mon-Sat · 10am-9pm
- Whether the funding matches the original illustration
- How the cash value is performing against its design
- If a policy loan is quietly working against you
- Whether the coverage still fits the life you have now
Straight answers
IUL questions, answered.
By Braxton Mondell, licensed in all 50 states · Updated June 2026
01What is an IUL?
An indexed universal life (IUL) policy is permanent life insurance with a cash value account that grows based on a market index, like the S&P 500. It has a floor — often 0% — so a down market year doesn’t subtract from the cash value you’ve built, and the death benefit passes to your family income-tax-free.
02What is an IUL account?
The “account” is the cash value inside the policy. Part of each premium funds it, and its growth is linked to an index with a floor underneath. In a year the index falls, the floor holds your cash value steady; in a year it rises, you’re credited up to a cap or participation rate the policy sets.
03Is an IUL a good investment?
An IUL is life insurance first, with a tax-advantaged growth component — and it does that job well when it’s funded and designed properly. The cases people criticize are almost always under-funded policies, where too little premium went in to let the design work. A free review tells you which kind you have.
04How do you open an IUL account?
You start an IUL with a licensed professional who matches the policy’s design and funding to your goal. The design — how much premium goes in and how the policy is structured — matters more than the brand name on the cover. That’s the part worth getting right up front.
05What is a max-funded IUL?
Max funding means paying the most premium the IRS allows without the policy becoming a Modified Endowment Contract (MEC). Staying under that line keeps the tax advantages intact and directs more of each dollar toward cash value instead of cost of insurance.
06What is IUL insurance?
It’s another way of saying an indexed universal life insurance policy — permanent coverage whose cash value tracks a market index with a floor for protection. Same product, shorter name.
This page is educational and not tax or legal advice. If changes to coverage are appropriate, they are completed through licensed insurance professionals. Product features like caps and participation rates vary by carrier and policy.
Have an IUL? Let’s read it together.
Grab your policy — or just the carrier’s name — and call. A licensed professional will tell you whether yours is funded the way it was designed, in about ten minutes.