Certain life insurance contracts accumulate cash values, which may be taken by the insured if the policy is surrendered or which may be borrowed against. Some policies, such as annuities and endowment policies, are financial instruments to accumulate or liquidate wealth when it is needed. See life insurance.

In many countries, such as the U.S. and the UK, tax law provides that the interest on this cash value is not taxable under certain circumstances. This leads to widespread use of life insurance as a tax-efficient method of saving as well as protection in the event of early death.

In U.S., interest income of life insurance policy (or annuity) is income tax deferred in general. However, its tax deferred benefit may be offset by a low return in some cases. This depends upon the insuring company, type of policy and other variables (mortality, market return, etc.). In 2000 and 2001 permanent life insurance had the second greatest investment return besides real estate. Also, other income tax saving vehicles (i.e. IRA, 401K or Roth IRA) appear to be better alternatives for value accumulation. Combination of low-cost term life insurance and higher return tax-efficient retirement account can achieve better performance.