Joint life continues either 50% or 100% of the applicable payment to the survivor. A ten-year-certain feature belongs to single life, while cash refund can protect a remaining purchase amount under its contract terms.
Increasing payments rise by a fixed 2% each year. They are not an inflation index, a FERS COLA, or a forecast of purchasing power.
A nonspouse joint annuitant must be an eligible former spouse or person with an insurable interest. Additional age-difference rules can constrain a 100% continuation.