Indexed Universal Life (IUL): How It Works, the Real Trade-offs, and Who It Fits
IUL is permanent life insurance with cash value tied to a market index — with caps, floors, and moving parts. Here is how it actually works, without the sales gloss.
IUL, in plain English
Indexed universal life is permanent life insurance with a flexible premium and cash value whose growth is linked to a stock index, such as the S&P 500 — but you are not actually invested in the market.
Instead, the insurer credits interest based on the index’s movement, subject to a cap on the upside and a floor that protects against loss. That structure is the whole story, and it is where the honest conversation lives.
How IUL works
Like other permanent policies, IUL provides a death benefit and builds cash value. What is different is how the cash value grows: interest is credited based on an index’s performance, with a floor (often 0%) that means you do not lose value in a down year, and a cap that limits how much you earn in a good one.
The premium is flexible — you can pay more or less within limits. That flexibility is a feature and a risk: underfunding an IUL can cause it to lapse later, taking the coverage and the tax benefits with it.