Issue Presented
               You asked whether the Deferred Retirement Option Plan (“DROP”) offered by the Indiana
                  Public Retirement System is a separate pension plan or just one part of an overall
                  defined benefit retirement plan. Notably, if a DROP is a part of an overall pension
                  plan, then the Social Security Administration (“SSA”) treats all pension payments
                  as a single pension for purposes of administering the Windfall Elimination Provision
                  (“WEP”) and Government Pension Offset (“GPO”). Because we see no reason to treat the
                  Indiana Public Retirement System’s DROP as a separate pension plan, we advise you
                  to treat it as part of the overall pension system.
               
               Background 
               1. DROP 
               Some employees who are eligible to retire and receive benefits under a government
                  employer’s defined benefit retirement plan can choose instead to continue working
                  and enroll in a DROP. P OMS RS 00605.362.C.2, GN 02608.102.B.3.a. The employee’s additional years of service and continued compensation are
                  not taken into account for purposes of the defined benefit formula; rather, the retirement
                  system adds money to the employee’s individual DROP account. POMS RS 00605.362.C.2, GN 02608.102.B.3.a.
               
               The DROP can be either a separate plan or part of the defined benefit plan. POMS RS 00605.362.C.2, GN 02608.102.B.3.b. DROP payments may be subject to the WEP. Beginning in 1986, the WEP eliminates
                  “windfall” Social Security benefits for individuals eligible for retirement or disability
                  insurance benefits and also a pension from employment not covered by Social Security.
                  POMS RS 00605.360.A. However, under the early-out or discontinued service exception, the WEP does not
                  affect individuals eligible for a pension before 1986 under an early-out option. POMS
                  RS 00605.362.C.1.
               
               The early-out or discontinued service exception is applied to the DROP as follows:
               
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                           If the DROP is a separate pension plan, the early-out or discontinued service exception
                              will apply only to the pension plan that the worker was eligible to receive before
                              1986 if all of the requirements in POMS RS 00605.362.C.1 are met.
                           
                           
                         
                      
                   
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                           If the DROP is a part of the defined benefit retirement plan, payments from both plans
                              are considered one pension for WEP purposes and the early-out or discontinued service
                              exception will apply to the combined payments if all of the requirements in POMS RS 00605.362.C.1 are met.
                           
                           
                         
                      
                   
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                           If there was no eligibility for either the defined benefit retirement plan or the
                              DROP prior to 1986, the WEP would apply to the combined payments.
                           
                           
                         
                      
                   
               
               POMS RS 00605.362.C.2.
               
               Similarly, DROP payments may be subject to the GPO, which reduces “the Social Security
                  spouse’s benefit of workers who receive a federal, state, or local pension based on
                  earnings from non-covered government employment.” POMS GN 02608.100.A. However, there is a “last day” exemption from the GPO if an individual’s last
                  day of employment was in a position that was covered by both Social Security and a
                  state or local government pension system. POMS GN 02608.102.A. In order for the “last day” exemption to apply, the last day of employment must
                  be before July 1, 2004, or the individual must have filed for spouse’s benefits before
                  April 1, 2004, and be entitled to those benefits based on that filing. See id. The
                  “last day” exemption is applied to the DROP as follows:
               
               
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                           If the DROP is a separate pension plan, the “last day” exemption will apply only to
                              the pension plan that the individual was participating in on the last day of government
                              service if all the requirements in POMS GN 02608.102.B.1 are met.
                           
                           
                         
                      
                   
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                           If the DROP is a part of the defined benefit retirement plan, payments from both plans
                              are considered one pension for GPO purposes and the “last day” exemption will apply
                              to the combined payments if all the requirements in POMS GN 02608.102.B.1 are met.
                           
                           
                         
                      
                   
               
               POMS GN 02608.102.B.3.b.
               
               2. Indiana Public Retirement System
               The Indiana Public Retirement System (INPRS) was established on July 1, 2011. Ind.
                  Code § 5-10.5-2-1. Through its board of trustees, INPRS administers eleven Indiana
                  public employee retirement plans consisting of eight defined benefit and three defined
                  contribution plans. INPRS, INPRS,
                     Board Governance Manual ; 5-6 (last restated Oct. 26, 2018, Ind. Code §§ 5-10.5-2-2, 5-10.5-2-5, 5-10.5-3-1.
                  Despite the creation of the INPRS board of trustees, each retirement fund continues
                  as a separate fund under the oversight of the board. Board Governance Manual, supra,
                  at 6; Ind. Code § 5-10.5-2-6.
               
               INPRS offers the DROP in connection with two of its retirement funds. The Indiana
                  General Assembly made the DROP available to members of the 1977 Police Officers’ and
                  Firefighters’ Pension and Disability Fund (’77 Fund) after January 1, 2003, and to
                  members of the State Excise Police, Gaming Agent, Gaming Control Officer and Conservation
                  Enforcement Officers’ Retirement Plan (EG&C Plan) effective July 1, 2008. INPRS, About
                  the DROP, https://www.in.gov/inprs/aboutthedrop.htm (last visited Sept. 10, 2019); INPRS, 1977 Police Officers’ and Firefighters’ Retirement
                  Fund Member Handbook 21, http://online.flipbuilder.com/kaxi/zqxw/ (last visited Sept. 10, 2019); INPRS, Excise, Gaming & Conservation Officers’ Retirement
                  Fund Member Handbook 19, http://online.flipbuilder.com/kaxi/rdee/ (last visited Sept. 10, 2019). The DROP is an optional benefit that allows eligible
                  members of both retirement plans to continue working and accumulate a DROP benefit
                  payable in a lump sum or three annual installments. About the Drop, supra. An employee
                  eligible to retire and immediately begin drawing unreduced benefits may enter the
                  DROP and declare a retirement date. Id. The DROP retirement benefit will be calculated
                  as if the employee had retired on the date the DROP period begins. Id. An employee
                  who chooses the DROP will continue employment in his/her current status for the DROP
                  period. Id. During this time, the DROP benefit is accrued. Id. An employee who terminates
                  employment on the retirement date at the end of the DROP period may choose between:
                  (1) a lump-sum/installment payment of the accrued amounts in the DROP account and
                  a monthly pension calculated based on salary and service at the time the member entered
                  the DROP, or (2) a monthly pension calculated based on salary and service at the time
                  the member exits from the DROP, with no lump-sum or installment amount. Id.
               
               Analysis 
               The DROP is administered by INPRS and is closely connected to its associated defined
                  benefit retirement plans (’77 Fund and EG&C Plan). Indeed, on its website INPRS states
                  unequivocally that the DROP is not a separate retirement system but “is just a new
                  benefit option within the existing retirement plan.” INPRS, Is the DROP a separate
                  retirement plan?, https://inprs-ingov.zendesk.com/hc/en-us/articles/115005164608-Is-the-DROP-a-separate-retirement-plan- (last visited Sept. 10, 2019). This statement is supported by many aspects of the
                  DROP. For example, the DROP is tied to the two defined benefit retirement plans in
                  terms of membership, since an employee cannot participate in the DROP unless s/he
                  is eligible for the pension. And eligible members of the ’77 Fund and EG&C Plan enroll
                  in the DROP by submitting an application form to INPRS, which, as noted above, administers
                  the ’77 Fund and EG&C Plan. See 1977 Police Officers’ and Firefighters’ Retirement
                  Fund Member Handbook, supra, at 21; Excise, Gaming & Conservation Officers’ Retirement
                  Fund Member Handbook, supra, at 19. In addition, information regarding the DROP is
                  contained in each plan’s Member Handbook as part of its description of retirement
                  options within the plan. See 1977 Police Officers’ and Firefighters’ Retirement Fund
                  Member Handbook, supra, at 3, 20; Excise, Gaming & Conservation Officers’ Retirement
                  Fund Member Handbook, supra, at 3, 18. The DROP is separate from the defined benefit
                  retirement plans only in the sense that benefits are calculated differently. Because
                  this distinction would hold true whenever one compares a DROP to a defined benefit
                  retirement plan, we do not believe that this distinction makes the DROP a “separate
                  pension plan” under agency policy.
               
               Conclusion 
               We believe that the agency should consider the DROP offered by INPRS as part of the
                  overall defined benefit retirement plan (’77 Fund and EG&C Plan) and not as a separate
                  pension plan. Accordingly, payments made under the DROP and the defined benefit retirement
                  plan should be treated as a single pension, for WEP and GPO purposes.