How an IUL Builds Tax-Free Retirement Income
The Short Version
An indexed universal life policy is permanent life insurance with a cash value that earns interest tied to a market index, with a 0% floor in down years. Fund it right and you can pull tax-free retirement income out later through withdrawals and loans. It costs more than a Roth and it has to be built correctly, so it fits some people and not others.
Most folks I talk to want the same thing in retirement. They want income they can count on, and they don't want a surprise tax bill chewing into it. That's where the idea of tax-free retirement income comes up, and it's the main reason people ask me about an indexed universal life policy, usually just called an IUL.
Let me walk you through how an IUL actually works, how the money comes out tax-free, and where it stacks up against a Roth and a 401k. I'll give you the upside and the downside, because this product is right for some people and flat wrong for others.
What an IUL actually is
An IUL is permanent life insurance first. It pays a death benefit to your family when you pass, the same as any life policy. The difference is what happens inside it while you're alive.
When you pay your premium, part of it covers the cost of insuring your life and the policy fees. The rest goes into a cash value account that can grow over time. With an IUL, that growth is tied to the performance of a stock market index, usually the S&P 500. You're not invested in the market directly. The insurer credits interest to your cash value based on what the index does, inside some limits we'll get to next.
One thing to be clear on up front. An IUL built for retirement income is usually "max funded." That means you put in close to the most the IRS rules allow for that death benefit, year after year. The point is to grow cash value, not to buy the biggest death benefit you can. Underfund it and the costs can eat you alive.
How the index crediting and the 0% floor work
This is the part people find interesting, so here's the plain version. Your cash value earns interest based on the index, but the insurer puts brackets around it.
- The floor. In a year the market drops, your credited interest can't go below 0%. So if the S&P falls 30%, your indexed account gets credited 0% for that year, not a loss. You still pay policy costs, but your indexed gains aren't wiped out. That floor is the whole selling point for a lot of people.
- The cap. In exchange for that floor, the insurer caps your upside. Caps move around, but lately they've often landed somewhere in the 9% to 11% range. If the index returns 25% and your cap is 10%, you get credited 10%. You give up the big years to skip the bad ones.
- Participation rate. Some strategies skip the hard cap and instead credit a percentage of the index gain. A 60% participation rate on a 20% index year credits you 12%. Different carriers and strategies mix caps, participation rates, and floors in different ways.
Here's the honest catch. Caps and participation rates aren't locked for life. The insurer can adjust them, within limits spelled out in the contract. That's one of the non-guaranteed pieces, and it's why an illustration showing smooth growth is a projection and not a promise.
How the tax-free income actually comes out
This is the question that brought you here, so let's be precise. Money coming out of a properly structured life insurance policy can be tax-free, and there are two ways it happens.
Withdrawals up to your basis
Your "basis" is the total of premiums you've paid in. Life insurance uses first-in, first-out treatment, so the money you withdraw first is treated as your own premiums coming back. That portion comes out income tax free. Once you've pulled out everything you put in, further withdrawals can become taxable, so most income plans don't stop there.
Policy loans against the cash value
After your basis, you switch to loans. You borrow against your cash value instead of withdrawing it. A loan isn't income, so the IRS doesn't tax it. There's no application and no credit check, because you're borrowing against your own policy. Your cash value can keep earning credited interest on the full amount while the loan is outstanding, depending on the loan type. This is how people pull a stream of tax-free dollars in retirement.
Two rules make this work. The policy has to stay in force, and it has to avoid becoming a Modified Endowment Contract, or MEC. A MEC happens when you stuff money in faster than the IRS allows, and it strips away the tax-friendly loan treatment. A policy built for income is designed to stay under that line on purpose.
IUL vs. Roth vs. 401k, the fair comparison
I'm not going to tell you an IUL beats everything. It doesn't. Each of these does a different job.
- 401k. If your employer matches, that's free money and a guaranteed return you won't get anywhere else. Contributions lower your taxable income now, but you'll pay ordinary income tax on every dollar you pull out later. Capture the match before you do anything fancy.
- Roth IRA. Simple, cheap, and tax-free in retirement. A self-directed Roth in index funds can cost you a fraction of a percent a year. The catch is the limits. In 2026 you can put in $7,000, or $8,000 if you're 50 or up, and high earners get phased out entirely.
- IUL. No IRS contribution cap, a 0% floor, tax-free access through basis and loans, and a death benefit your family gets either way. The cost is real though. You're paying for insurance and fees a Roth doesn't have, and the caps limit your best years.
For most people the order looks like this. Get the 401k match. Fund the Roth. Then, if you still have money you want to grow tax-free and you've got room in your budget for the long haul, an IUL can be the next bucket. It's usually an "and," not an "instead of."
Who an IUL fits, and who should skip it
It tends to fit people who:
- Already max the easy tax-advantaged accounts and want more tax-free room.
- Earn too much for a Roth and want a tax-free bucket anyway.
- Can fund it consistently for many years without flinching.
- Like the idea of a death benefit and a floor riding along with the growth.
It's usually the wrong tool if:
- You haven't captured your employer match yet. Start there.
- Your budget is tight or your timeline is short. Surrender charges in the early years can hurt if you bail.
- You want the cheapest, simplest path to market returns. That's a Roth in index funds, plain and simple.
- You only need temporary coverage. Then you want term life, not this.
Common mistakes I see
- Underfunding it. An IUL built for income needs to be fed. Pay the minimum and the costs can hollow out the cash value over time.
- Buying too much death benefit. A bigger death benefit means higher cost of insurance, which leaves less going to cash value. For income, you size the death benefit down and the funding up, within the rules.
- Treating the illustration as a promise. Those projections lean on non-guaranteed caps and credited rates. Ask to see it run at lower assumed rates so you know the floor of the experience, not just the dream.
- Over-borrowing late in life. Loan interest compounds. Pull too much and an aging policy can lapse, which turns a tax-free plan into a taxable mess.
None of this is meant to scare you off. It's meant to show you that an IUL is a built thing, not a bought thing. Designed well and funded right, it can do exactly what people hope. Designed poorly, it disappoints. The design is the job, and it's worth doing with someone who'll show you the math.
If you want to compare this against other tools, it's worth reading up on how annuities work and the be your own bank idea too, since they often come up in the same conversation.
Frequently asked
Is the income from an IUL really tax-free?
It can be, when the policy is set up and managed correctly. You can withdraw up to the premiums you paid in tax-free, and you can take policy loans against the cash value without triggering income tax. The policy has to stay in force and avoid becoming a Modified Endowment Contract. This isn't tax advice, so talk to a tax professional about your own situation.
Is an IUL better than a Roth IRA or a 401k?
Not better, just different. A Roth is simpler and cheaper and has no insurance costs. A 401k often comes with a match you shouldn't pass up. An IUL adds a 0% floor, a death benefit, and no IRS contribution cap. Most people who use an IUL fund it after they've captured the match and used their Roth, not instead of those.
What are the downsides of an IUL?
It has cost of insurance and fees that a low-cost index fund doesn't. Surrender charges apply in the early years. The caps limit your upside in big market years. It has to be funded and structured properly, and the illustration is a projection, not a promise. If you stop funding it or borrow too much, the policy can lapse.
How much do I need to put in for an IUL to work?
There's no single number, but an IUL built for income usually means funding it consistently for years, near the maximum the IRS rules allow for that death benefit. Underfund it and the costs can eat the cash value. If your budget is tight or short-term, an IUL is probably not the right tool.
Want to see if an IUL fits you?
Fifteen minutes. We'll look at your income goals, your budget, and whether an IUL even makes sense for you. If a Roth does the job better, I'll tell you that.
Book a 15-Min Retirement-Income ReviewJoseph McDermott is a licensed life insurance agent and founder of Sovereign Life Group, brokered through Family First Life. This article is general information only and is not financial, tax, or legal advice. Talk to a qualified tax professional before acting. Indexed universal life is permanent life insurance with costs of insurance, fees, and surrender charges. IUL cash values and index-credited returns are not guaranteed and assume non-guaranteed elements such as caps, participation rates, and credited interest that the insurer can change. Policy loans and withdrawals reduce the death benefit and cash value and may have tax consequences, including taxable income if the policy lapses or is surrendered with a loan outstanding. Any illustration is a projection, not a promise of future results. Product availability, features, and rates vary by state and carrier. Guarantees are subject to the claims-paying ability of the issuing insurance company. Reach out with questions about your situation.