Generally, a beneficiary reports pension or annuity income in the same way the plan participant would have reported it. However, some special rules apply.
A beneficiary of an employee who was covered by a retirement plan can exclude from income a portion of nonperiodic distributions received that totally relieve the payer from the obligation to pay an annuity. The amount that the beneficiary can exclude is equal to the deceased employee's investment in the contract (cost).
If the beneficiary is entitled to receive a survivor annuity on the death of an employee, the beneficiary can exclude part of each annuity payment as a tax-free recovery of the employee's investment in the contract. The beneficiary must figure the tax-free part of each payment using the method that applies as if he or she were the employee.
Benefits paid to a survivor under a joint and survivor annuity must be included in the surviving spouse’s gross income in the same way the retiree would have included them in gross income.