Our six chosen insurance companies offer some of the highest cash-values in the industry. The 6 best indexed universal life insurance (IUL) companies We pulled illustrations from each of the six best providers of IULs to show exactly how their policies grow potential wealth for retirement. The large cash value of an indexed universal life insurance (IUL) can also be accessed with partial withdrawals during retirement years, and many policyholders use it to provide supplemental income. A minimum premium payment to keep the policy from lapsing is built in to make it easier to maintain life insurance in all financial situations. These indexed universal insurance policies are also designed to provide extra flexibility for policyholders. Are you looking for a way to set aside some extra money for your senior years, and maybe a little extra for loved ones to inherit? Most people opt for indexed universal life insurance because it offers the greatest cash value growth tied to the performance of S&P 500 index with the least risk thanks to floor rate.