IUL vs. Term Life Insurance: Cost, Risk, and Who Each Fits

Term life insurance is usually the better fit if you mainly need a large death benefit for a set number of years, because it costs far less and has nothing to manage. Indexed universal life (IUL) can make sense if you need lifelong coverage, can pay well above the minimum premium for many years, and accept that its cash value growth is capped and not guaranteed. For most families protecting a mortgage or young children, term does the core job at a fraction of the cost.

This guide compares the two side by side. If you are new to IUL, start with our explainer on what indexed universal life insurance is and come back.

What is the difference between IUL and term life insurance?

Term covers you for a set period and pays only if you die during it; IUL is permanent coverage with a cash value account whose interest is linked to a stock index. That one design choice drives every other difference in cost, risk, and flexibility.

According to FINRA, indexed universal life falls under the universal life umbrella but "follows a set stock index (such as the S&P 500) rather than allowing policyholders to choose their investments." FINRA also notes IUL is generally not considered a security, so state insurance departments regulate it.

Why is term life so much cheaper than IUL?

Term is cheaper because you pay only for protection during a window you are likely to outlive. The NAIC's life insurance guide says term "generally offers the largest insurance protection for your premium dollar."

An IUL premium does two jobs. It pays for the insurance and it builds a cash value account that has to keep paying for that insurance as you age. The Insurance Information Institute explains that the cost per $1,000 of coverage rises as a person ages and gets very high past 80. In an IUL, those rising charges come out of your cash value each month.

For a hypothetical 40-year-old wanting $500,000 of coverage, the gap might look like this. These are round illustrative numbers, not quotes:

• 20-year term: about $500 a year
• IUL designed to build cash value: about $6,000 a year

Your real prices depend on your age, health, the insurer, and how the IUL is designed. The point is the scale: IUL often costs several times more for the same death benefit.

How does IUL cash value actually grow?

IUL cash value earns interest based on an index, limited by a cap on the upside and a floor on the downside. You do not own the index or receive its full return.

The SEC's investor bulletin on indexed annuities, which use the same kinds of crediting limits, explains the main levers:

• Cap. The most interest you can be credited in a period. With a hypothetical 9% cap, a 15% index gain credits 9%.
• Participation rate. The share of the index gain you receive. At a hypothetical 80% rate, a 10% gain credits 8%.
• Dividends excluded. Index gains are usually measured without stock dividends.
• Floor. Many IUL accounts have a 0% floor, so a losing year credits 0% rather than a loss.

The bulletin also warns that contracts "commonly allow the insurance company to change some of these features periodically, such as the rate cap." A cap you see at purchase is not locked in for decades.

Can an IUL policy lapse?

Yes, an IUL can lapse if the cash value runs out, even if you have paid premiums for years. This is the biggest risk to understand before you buy.

The Texas Department of Insurance explains that with universal life, if your premiums are lower than the cost of insurance, "the difference is taken from the cash value. If the cash value reaches zero, your policy could lapse." The New York Department of Financial Services warned in a consumer alert that internal charges "can increase every year" and that many universal life owners found their policies "had lapsed and had little to no value," or had to pay large extra premiums to keep coverage.

Lapse risk is highest when a policy is funded near the minimum, when crediting rates come in below what was illustrated, or when you take policy loans that aren't repaid.

Are IUL illustrations guaranteed?

No. An illustration is a projection of how the policy might perform, and only the guaranteed columns are promises. The rest depends on future charges and crediting.

The NAIC's Life Insurance Illustrations model rules require illustrations to show both guaranteed and non-guaranteed values. For indexed policies, the NAIC adopted Actuarial Guideline 49-A, which applies to policies sold on or after December 14, 2020. According to the guideline text, it:

1. Caps the highest rate an insurer may illustrate, based on a benchmark S&P 500 account with a 0% floor.
2. Limits how much an illustration can show policy loans earning more than they cost.
3. Requires a side-by-side ledger at a lower rate, shown with equal prominence.
4. For policies sold on or after April 1, 2026, requires a statement that historical index changes "are not indicative of future returns."

Ask for the guaranteed column and the lower-rate column, not just the most attractive one. If the policy only works at the highest illustrated rate, it is underfunded for real life.

Should I buy term and invest the difference instead of IUL?

For many people, yes, as long as you actually invest the difference and keep doing it. The strategy pairs cheap term coverage with savings you control.

The NAIC lays out the trade-offs plainly. Term premiums rise if you renew as you age. If you invested the difference, you can use it to pay those higher costs or cover needs yourself. If you spent it, you will have to dip into other savings. And if your health gets worse, you may not be able to buy a new policy.

Take a hypothetical 40-year-old choosing between the two premiums in the example above. Buying term leaves about $5,500 a year to invest. Over 20 years, that money is yours to access without surrender charges, policy loans, or crediting caps. The trade-off is that at 60 the term ends, and new coverage will cost more or may not be available if health has changed.

IUL can make more sense than term plus investing if you:

• Need coverage that lasts past your 70s or 80s, such as for an estate or a lifelong dependent
• Have already used tax-advantaged retirement accounts and have steady extra income
• Can commit to funding the policy well above the minimum for decades
• Will review the policy every year and add money if it falls behind

Who should choose term life, and who should choose IUL?

Choose term if your need has an end date and your budget is limited. Choose IUL only if your need is permanent and you can fund and monitor the policy for the long haul.

Many households combine the two: a term policy for the years the family depends on your paycheck, plus a smaller permanent policy for lifelong needs. For a broader look at every option, see our types of life insurance compared and the classic term vs. whole life breakdown.

What should I ask before buying an IUL?

Ask questions that show how the policy behaves when things go worse than illustrated. The NAIC suggests asking what part of the premium or policy value isn't guaranteed and whether there are guaranteed minimums.

1. What are the current cap and participation rate, and what are the guaranteed minimums?
2. What premium keeps the policy in force to age 100 if the index credits only the guaranteed rate?
3. What are the surrender charges, and for how many years?
4. How do policy loans work, and what happens to the death benefit if I don't repay them?
5. Will you give me an in-force illustration every year?

Not sure how much coverage you need in the first place? Start with our life insurance calculator, then explore more comparisons on the policy types hub.