cash (surrender) value and nonforfeiture
Because a level-premium policy overcharges in the early years, a policyholder who quits has, in effect, prepaid some of their future insurance. It would be unfair to let the insurer simply keep all of that. The cash (surrender) value is the amount the company pays back if you cancel a permanent policy and walk away. Nonforfeiture is the broader legal promise that this built-up value cannot simply be forfeited — the policyholder gets to keep it in some form even on lapse.
Precisely, the cash surrender value is closely related to the policy reserve, but a bit less: it is typically the reserve minus a surrender charge that recovers the insurer's not-yet-amortized acquisition expenses (commission, underwriting) and discourages early exit. Nonforfeiture law gives the departing policyholder a menu of options instead of forfeiting the value: (1) take the cash, (2) convert it into a smaller fully paid-up policy ('reduced paid-up'), or (3) use it to keep the full death benefit for a shorter fixed term ('extended term insurance'). Each option is the actuarial equivalent of the cash value.
These features matter because they make permanent insurance partly a savings vehicle and protect consumers from losing everything if circumstances change. They also shape insurer risk: policyholders can lapse and take cash exactly when it hurts the company (high interest rates make the option valuable), creating disintermediation risk. A key clarification: the cash value is usually LESS than the sum of premiums paid in early years (because of surrender charges and the cost of insurance already consumed), so surrendering a young policy is normally a poor financial deal even though it is not 'forfeiture'.
After 10 years your whole-life reserve is $15,000 but the company applies a $1,000 surrender charge, so your cash value is $14,000. Instead of cash you could elect a reduced paid-up policy worth, say, $38,000 of death benefit with no further premiums.
Cash value ≈ reserve minus a surrender charge; nonforfeiture gives cash, paid-up, or extended-term options.
Cash value is usually less than total premiums paid in the early years — surrendering a young policy is rarely a good deal, even though the value is not technically 'forfeited'.