дополнительный страхователь(In US insurance policy, an additional insured is a person or organization that enjoys the benefits of being insured under an insurance policy, in addition to whoever originally purchased the insurance policy. wiki Alexander Demidov)
дополнительные пенсионные выплаты(Example: The costs shown in the table are for both a single payment and monthly contributions to buy various additional pension benefits.(Из пенсионного страхования) Пазенко Георгий)