Permanent life policies carry a cash component that term policies do not. That component grows from a specific split in how each premium payment is used.
Premium is divided before anything accumulates
Each payment into a permanent policy is split three ways: the cost of providing the death benefit for that period, the insurer's expenses and the commission paid to sell the contract, and whatever remains after both.
The remainder is credited to cash value. In the early years that remainder is small, sometimes close to nothing, because acquisition costs are front-loaded into the first years of the contract.
This is why surrendering a policy early usually returns far less than the premiums paid. The money went to protection and expenses rather than into an account.
The insurance charge rises as the insured ages
The pure cost of insuring a life increases every year. A level premium therefore overpays in the early years and underpays later.
Cash value is partly that overpayment held in reserve. It absorbs the growing mortality charge so the premium can stay flat.
Understood that way, cash value is less a savings vehicle than a prefunded reserve that happens to be accessible.
Crediting method depends on the policy type
Whole life credits a rate the insurer declares, sometimes with dividends on participating policies. Growth is slow and predictable, and the insurer bears the investment risk.
Universal life credits interest on a declared or index-linked basis, while variable policies place the value in subaccounts whose performance the policyholder bears.
The further crediting moves toward market exposure, the more the policy's ability to sustain itself depends on returns the illustration only assumed.
Access comes as a loan rather than a withdrawal
Policy loans borrow against the cash value using it as collateral. The value continues to be credited while the loan accrues interest.
An unpaid loan reduces the death benefit by its balance. If loan and interest grow past the cash value, the policy can lapse.
A lapse with a large outstanding loan can carry consequences worth reviewing with a professional before borrowing heavily.
Illustrations describe assumptions, not outcomes
Sales illustrations project decades of crediting, charges and premiums. Every line beyond the guaranteed column rests on assumptions that can change.
Insurers may adjust cost-of-insurance charges and crediting rates within contractual limits, which shifts how the value accumulates.
Comparing the guaranteed columns of two illustrations tells a buyer more than comparing the projected columns, because only the guarantee is a promise.