You pay a premium and it disappears into an insurance company. Where does it actually go? Following the money explains more about how these policies behave than any brochure ever will, so let's follow it.
A slice covers the cost of insurance, the pure price of that year's death benefit protection. A slice covers the company's expenses. The rest, and in a well-designed high cash value policy it's the bulk, flows into the insurer's general account.
The general account is huge, and it's boring on purpose. Mostly long-term bonds, corporate bonds, mortgages, treasuries, bought to be held for decades and matched against the promises the company has made. Regulators make the company invest carefully here, and most build in more cushion than the rules ask for. That's why a whole life policy's guaranteed growth is modest. It's also why the company can keep paying that guarantee through recessions that flatten flashier portfolios.
Dividends are what happens when reality beats those cautious assumptions. Fewer claims than priced for, lower expenses, better bond yields, and the surplus gets shared with participating policyholders. That's why dividends move slowly in both directions, and why nobody can guarantee them. A dividend is the gap between careful pricing and real results. That gap can shrink. I covered the current climate in Why Dividend Rates Are Climbing After a Decade of Drift.
An IUL routes one slice differently. Instead of crediting you the bond yield directly, the company spends roughly that yield buying index options, which is what creates the market-linked upside and the floor. Same careful engine underneath. Different way of crediting on top.
Why teach this? Because once you see the machinery, the sales claims sort themselves out. Promises of stock-market returns from a bond-backed product should raise an eyebrow. So should panic that the whole thing is a trick. It's a regulated, bond-backed savings engine with insurance attached, and it acts like one. How that engine compounds over the years is the subject of the how it grows page.