Why Indexed Universal Life Insurance Is Booming — And How It Actually Works

The life insurance aisle has a new bestseller. Driven by a desire for stock-market gains without the stomach-churning volatility of sudden crashes, investors are pouring billions into a complex hybrid product known as indexed universal life insurance, or IUL. According to the industry trade group LIMRA, sales of IUL policies hit a record $4.5 billion in 2025, a 17% jump from the previous year. Today, these policies account for roughly one-quarter of all new life insurance sales in the United States.[1][2]

The pitch is undeniably attractive: a "have-your-cake-and-eat-it-too" financial instrument that offers lifelong death benefit protection, tax-free growth potential, and a strict guarantee that your principal won't evaporate if the stock market tanks. But financial advisors warn that IULs are not magic bullets. They are highly complex insurance contracts first and investment vehicles second, requiring active management, a high tolerance for fees, and a clear understanding of the fine print.[1][3]

To understand why IUL is booming, it helps to look at the mechanics. Like all permanent life insurance, an IUL policy is split into two buckets. When a policyholder pays their premium, a portion goes toward the actual cost of insurance and administrative fees. The remainder is funneled into a cash-value account. What makes an IUL unique is how that cash value grows. Instead of earning a fixed, low interest rate declared by the insurer—as is the case with traditional whole life or standard universal life—the cash value's growth is linked to the performance of an external market index, most commonly the S&P 500.[3][4][6]

Crucially, the money is never actually invested directly in the stock market. Instead, the insurance company uses complex financial instruments, such as options, to mirror the index's movements. This indirect linkage allows the insurer to offer the IUL's most famous selling point: the "floor." Most IUL policies come with a guaranteed minimum crediting rate of 0%. If the S&P 500 drops 20% in a given year, the policyholder's cash value does not lose 20%. It simply earns 0% for that period, locking in previous gains and protecting the principal from market devastation.[4][5][7]

However, that downside protection comes at a strict cost on the upside. Insurers limit how much of a bull market the policyholder gets to keep through mechanisms known as "caps" and "participation rates." If a policy has a 10% cap and the S&P 500 surges 18% in a year, the cash value will only be credited with 10%. Furthermore, the index performance used to calculate these gains almost always excludes dividends, which historically make up a significant portion of total stock market returns.[5][8]

The 0% floor also comes with a critical caveat that consumer protection advocates frequently highlight: a 0% return does not mean the account balance stays flat. Even when the market is down and the cash value earns nothing, the insurance company continues to deduct the monthly cost of insurance and administrative fees. During a prolonged bear market, these ongoing deductions can actively shrink the cash value, eating into the principal despite the protective floor.[1][5]

Despite these limitations, IULs have become a favorite tool for high-net-worth individuals and aggressive savers who have already maxed out their 401(k)s and IRAs. Because life insurance cash value grows on a tax-deferred basis, an IUL functions as a tax shelter with no IRS contribution limits. Policyholders can funnel massive amounts of cash into the policy, let it grow tax-free, and eventually access the money through policy loans.[3][4]

These policy loans are a major draw. As long as the policy remains in force, money borrowed against the cash value is generally not considered taxable income by the IRS. This allows wealthy individuals to use their life insurance as a private bank, funding real estate purchases, business ventures, or retirement income without triggering capital gains taxes. If the policyholder dies with an outstanding loan, the balance is simply subtracted from the tax-free death benefit paid to their heirs.[4][7]

Flexibility is another key feature driving the IUL boom. Unlike traditional whole life insurance, which requires strict, fixed premium payments, IUL policies allow the policyholder to adjust their premiums and death benefits over time. In a good year, a policyholder can overfund the policy to maximize cash value growth. In a tight financial year, they can reduce their out-of-pocket premiums, allowing the accumulated cash value to cover the internal cost of insurance.[3][6]

But this flexibility introduces a significant risk: policy lapse. If a policyholder underfunds the IUL for too long, or if a string of flat market years results in low interest crediting, the cash value can become insufficient to cover the internal fees. This problem accelerates as the policyholder ages, because the internal "cost of insurance" rises every year. If the cash value hits zero, the policy lapses, the death benefit vanishes, and the policyholder may face a massive unexpected tax bill on the phantom gains.[5][8]

Because of these complexities, financial advisors stress that IULs are not for everyone. For the average family simply looking to ensure their mortgage is paid and their children are provided for if a breadwinner dies unexpectedly, cheap and simple term life insurance remains the gold standard. Term life provides a massive death benefit for a fraction of the cost of an IUL, though it expires after a set period and builds no cash value.[1][3]

For those who do need permanent, lifelong coverage, the choice often comes down to risk tolerance. Whole life insurance offers slow, steady, guaranteed growth with zero market risk. Variable universal life (VUL) allows policyholders to invest directly in mutual funds, offering unlimited upside but exposing the cash value to severe market losses. IUL sits squarely in the middle—a hybrid designed to capture a slice of the market's upside while strictly capping the downside.[3][4]

Ultimately, the surge in IUL sales reflects a broader shift in how Americans are approaching wealth management. As traditional pensions disappear and market volatility remains a constant headline, the desire for financial products that offer both growth and guardrails has never been higher. When properly funded and actively monitored, an indexed universal life policy can be a powerful, tax-efficient engine for generational wealth.[2][7]

However, buyers must enter the contract with their eyes open. The glossy brochures highlighting stock-market gains and zero-percent floors often obscure the reality of rising insurance costs and strict earning caps. Success with an IUL requires treating it not as a "set-it-and-forget-it" safety net, but as a dynamic financial asset that requires decades of careful attention.[1][5]