Policy Design: Base + Paid-Up Additions
IBC policies are engineered to maximize early cash value with a base policy and a Paid-Up Additions rider.
From Becoming Your Own Banker, Chapter 12
A standard whole life policy is designed primarily for death benefit. Most of your early premium goes toward insurance cost, with little building cash value. That's not ideal for IBC.
To optimize for banking, the policy uses two components: a base whole life policy and a Paid-Up Additions (PUA) rider. The base provides the guaranteed death benefit and contractual foundation. The PUA rider lets you overfund — putting in significantly more than the base premium requires.
Paid-Up Additions are small, fully paid-up life insurance policies stacked on top of your base. Each PUA immediately creates cash value and death benefit. Because they're fully paid from the start, nearly all of the PUA premium goes directly to cash value. This is why IBC policies build cash value so much faster than traditional whole life.
There's an important limit: the MEC line. Policy design involves calibrating the base-to-PUA ratio so you put in as much as possible without crossing that threshold. Nash described this as "snuggling up to the MEC line but not crossing it." Cross it, and policy loans become taxable events — which defeats a core benefit of the strategy.