Two flavors of policy can run a lifetime line of credit. Whole life is the engine. Indexed universal life is the alternative. I own both, and neither is the winner. The situation and the design decide, so the useful thing is to understand what each one actually does under the hood.
A whole life policy makes you two promises in the contract itself: a guaranteed death benefit and a guaranteed schedule of cash value growth. That guaranteed column is the floor. Whatever the market does, whatever the news says, the floor holds.
On top of the floor sit dividends. When the carrier collects more and spends less than its guarantees assumed, the surplus flows back to policyholders. With a mutual carrier, the policyholders own the company, so the surplus is yours by structure. The strongest mutuals have paid dividends every single year for more than 150 consecutive years, through depressions, wars, and every rate environment in between. Dividends aren't guaranteed, and I'll say that every time. That track record is why I treat them as dependable anyway.
The growth is steady rather than exciting, more akin to the safety of bonds than to stocks. That's the point. It's the safe asset in the plan, which frees the rest of your portfolio to take risk on purpose instead of by default. And the compounding never interrupts: dividends buy paid-up additions that earn dividends that buy additions, for as long as you live.
An IUL runs the same machine with different settings. Instead of a guaranteed growth schedule plus dividends, your cash value earns interest credited from the movement of a market index, with a floor of zero in the down years and a cap or participation rate in the up years. The market crashes, you earn nothing that year, but you lose nothing either, and your line of credit doesn't shrink.
Where's the catch? The risk lives in the moving parts. Caps and participation rates can be changed by the carrier, and internal costs rise with age, which is why funding an IUL properly matters even more than it does with whole life. A well-funded IUL from a major carrier with great ratings and very low expenses is a strong tool. A minimally funded one is a slow leak dressed up as a policy.
A word of caution: an IUL illustration showing a smooth high return every year is showing you an average, and real markets don't pay averages. Read the guaranteed column, then judge the rest with hedged eyes. More on reading illustrations in the design lesson.
Your money generally lives in one of three tax buckets: taxable, tax-deferred, and tax-free. A properly structured policy lives in the third one. The cash value grows tax-deferred. Access through policy loans is generally income-tax-free. The death benefit passes income-tax-free to your family. That's not a loophole someone found; it's in the code, and it's been there for generations.
Now the asterisks, because I won't let a tax claim stand half-true. Dividends taken as cash above your cost basis do get taxed. Overfund the policy past the MEC line and the whole tax treatment flips against you. Withdrawals are treated differently than loans. This is exactly why you work with a pro who designs around those lines, and why "generally" is doing real work in this paragraph.
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