Example of a contingent annuitant
Suppose you're concerned that you'll outlive your savings, so you're contemplating an annuity to provide guaranteed retirement income. You're 60 years old and considering investing $250,000 in an annuity that would start paying out in 10 years. If you chose a single life-only annuity (meaning you're the only annuitant), you could receive monthly payments of around $3,300 for life.
But if you wanted to guarantee lifetime income for your spouse, also 60 years old, you could make them a contingent annuitant. The annuity company knows it will likely have to make payments over a longer period, so you'd receive monthly payments of only $2,700. However, you'd provide your spouse with an extra layer of financial security.