Inside every IUL is a charge most owners never look at: the cost of insurance, deducted monthly, priced like annually renewable term. That structure means the price per dollar of coverage goes up every year you age. This isn't a defect or fine-print trickery, it's the design, and whether it ever becomes a problem depends almost entirely on one decision you control: how well the policy is funded.
Here's the mechanism. The charge applies to the net amount at risk, the gap between your death benefit and your cash value. In a well-funded policy, cash value grows year after year, the gap narrows, and the shrinking coverage amount offsets the rising price per unit. The two curves roughly cancel, and the policy carries its costs comfortably into old age. That's the version the illustration assumed.
In a thinly funded policy, the curves compound against each other instead. Small cash value means a wide gap, charged at prices that rise every birthday. The charges eat the cash value, which widens the gap further, which raises the charges again. Left alone long enough, the policy consumes itself, usually in the owner's seventies or eighties, exactly when replacing coverage is impossible or brutally expensive. A lapse at that point can even leave a tax bill behind if loans were outstanding. Most IUL horror stories trace back to this loop: minimum premiums, maximum death benefit, and twenty years of nobody checking.
The defense is plain maintenance. Fund the policy properly, closer to the maximum the MEC rules allow than the minimum the contract accepts. Review it annually: compare actual cash value against what the illustration projected for that year, and check what the company has done to your cap since last year. Ask for an in-force illustration every few years and read it the way we practiced in How to Read a Policy Illustration Without Getting Fooled. Our sister site keeps a practical checklist in What to Review on Your Policy Anniversary, and it covers this in ten minutes a year.
An IUL illustration is a projection built on levers the company can move and charges that only go up. That doesn't make the product bad. It makes the product a machine that needs an operator. Whole life handles the same problem differently, with charges leveled by contract from day one, and the comparison between the two engines is laid out in IUL vs. Whole Life. Pick either, but pick with your eyes on the charge column, and never buy an IUL you intend to ignore.