Professional soldiers have their own social security system, separate from the general social insurance system, which provides social protection in the event of long service, total incapacity to serve and the death of the breadwinner (pension benefits). At the same time, a professional soldier can accumulate and receive two pensions from different systems, ie universal and reserve. However, the principle of accumulation of benefits based on the applicable provision is dedicated to a narrow group of entitled persons. The principle of non-cumulation is considered to be the basic and dominant one. It is an expression of the principle of risk solidarity in force in social insurance law and is not inconsistent with the constitutional principle of equality expressed in Art. 32 of the Polish Constitution. In the event of the overlapping of the right to several benefits specified in the Act, the pension authority is obliged to pay only one (higher) benefit, even if this right results from various acts, and the possibility of combining benefits must be clearly indicated in the provisions of law. Separation of the insurance and supply system allows each of these systems to fulfill separate obligations towards professional soldiers, not related to the general system. Maintaining the principle that for the same period of retirement pension insurance, two retirement benefits cannot be awarded simultaneously (Article 5 (2a) (2a) of the Pension Act). The exception to the principle of non-accumulation (ie the principle of collecting one benefit) in the case of a professional soldier remaining in service before January 2, 1999 is not determined by the date of admission to service, but the lack of the possibility to calculate the military pension taking into account the “civil” retirement age. The convergence of the right to benefits (from the general and military pension) with the parallel occurrence of these events is contrary to the constitutional principle of social justice. It is not socially just to deprive an insured person who has met the statutory requirements of the right to benefits solely on the basis of social solidarity. In such situations, a significant part of the retiree’s professional life is not reflected in the amount of received retirement benefits.