What is the difference between whole life and IUL insurance?

Both whole life and indexed universal life (IUL) are permanent life insurance policies with cash value, but they differ in how that cash value grows and how premiums are structured.

Whole life offers guaranteed cash value growth at a fixed minimum rate set in the contract, plus the potential for non-guaranteed dividends from participating carriers (dividends are not guaranteed). Premiums are fixed and never change. The predictability and guarantees of whole life make it attractive for conservative savers and estate planners.

IUL links cash value growth to a market index—most commonly the S&P 500—subject to a floor (typically 0%) and a cap (typically 8–12%). When the index rises, your policy is credited interest up to the cap. When the index falls, the floor protects you from losses. Policy fees are deducted from cash value regardless of index performance.

IUL premiums are flexible within limits, and the growth potential exceeds whole life in favorable market periods. However, IUL is more complex, and long-term results depend on cap rates (which carriers can adjust), policy fees, and index performance. Both are long-term instruments best suited to specific financial goals.