What describes an annuity where premiums are paid in installments over a set period of time?

The correct answer is a periodic premium annuity, which is structured to allow the policyholder to pay premiums in regular installments (periodically) over a specified duration. This type of annuity helps individuals save gradually over time, which can be particularly beneficial for those who may not have a large lump sum available for a single premium payment.

With a periodic premium annuity, the installments can be made annually, semi-annually, quarterly, or monthly, providing flexibility and making it easier to budget for the payments. As the premiums are paid, the funds grow tax-deferred until they are withdrawn, typically during retirement when the annuity begins to pay out.

In contrast, a single premium annuity requires a one-time lump sum payment to fund the annuity, making it different from the periodic structure. An immediate annuity begins making payments right after the premium is paid, while a flexible premium annuity allows the policyholder to vary their premium payments but doesn't specify a set period for them as much as a periodic premium annuity.