From the IRS website:
The interest on your life insurance dividends is taxable in the tax year it is credited to your account and must be reported on your tax return if you can withdraw it in that tax year. However, if you can only withdraw the life insurance interest on the anniversary date of the life insurance policy (or other specified date), the life insurance interest is taxable and must be reported on your tax return in the tax year in which that date occurs.
Life insurance dividends are not taxable and you should not report them on your tax return.
If life insurance death benefits are paid to you in a lump sum or other than at regular intervals, include the life insurance death benefits in your gross income on your tax return only to the extent the life insurance death benefits are more than the amount payable to you at the time of the insured person’s death. In other words, if the life insurance death benefit is $50,000 and you receive $50,100 the $100.00 is taxable interest and you must report it on your tax return. The $50,000 in life insurance death benefits is generally tax free and you do not report it on your tax return. In other words, if the life insurance death benefit is $50,000 and you receive $50,000, there is no taxable interest and thus nothing to report on your tax return.
If you receive life insurance proceeds in installments you can exclude a part of each life insurance installment from your taxable income on your tax return because it includes both life insurance death benefits and life insurance interest. Divide the life insurance death benefits of the policy by the number of years payments are to be received. That's the amount that is tax free each year.
You must give the payer of your interest income your correct social security number. If you do not, you may be subject to a tax penalty and to back-up tax withholding. For more information see "What is Form W-9 and backup tax withholding?"
Interest has be reported, but not the actual proceeds from the life insurance.