Indexed Universal Life: Cap Rates

Indexed universal life (IUL) insurance credits interest to your cash value based on the movement of a market index, usually the S&P 500, without directly investing in it. The appeal is upside linked to the market with protection from losses. The reality is that several mechanisms - especially the cap rate - determine how much of the index's gain you actually receive.

The control knobs of an IUL

• Cap rate. The maximum interest credited in a period, often 8 to 12 percent. If the index rises 20 percent, you get only the cap.
• Participation rate. The share of the index gain you receive, such as 100 percent up to the cap or a lower percentage of an uncapped gain.
• Floor. Usually 0 percent, protecting you from a negative index year.
• Crediting method. Point-to-point, monthly cap, or monthly average, each producing different results.

Credited interest = min(cap, index change × participation rate), floored at 0%

The asymmetry people miss

The 0 percent floor and the cap are not symmetrical. In a bad year you earn nothing, not a loss. But in a great year you are capped, so you capture only part of the recovery. Over a long period, the caps cost you more of the up years than the floor saves you in the down years, which is why actual IUL returns often trail the underlying index by a wide margin.

What to check before buying

• How low the guaranteed minimum cap is, not just today's rate.
• The cost of insurance charges, which rise with age and can erode cash value.
• Surrender charges for the early years.
• Whether illustrations rely on optimistic assumptions that may not hold.

Caps are not fixed

Insurers can change cap and participation rates in the future, subject to a guaranteed minimum. A policy profitable at today's cap can underperform badly if the company lowers it later.

Frequently asked questions

Is an IUL a stock market investment? No. You do not own the index, receive dividends, or bear its losses. It is an insurance contract with a crediting formula.

Who might use one? Someone seeking tax-deferred growth with downside protection, who understands the caps and is willing to fund it consistently.

Model your own scenario with the calculator below.