Social insurance by definition includes features of State income maintenance schemes, based on the principle of solidarity. The social insurance system as it has evolved in recent decades has a strong solidarity component. The social insurance system is not however insurance in the fully commercial or actuarial sense. The fact that an individual does not satisfy the qualifying conditions for a particular scheme does not mean that they should automatically receive a refund of their contributions.
To qualify for an old age contributory pension a person must have entered insurance at least ten years before reaching pension age, have at least 156 contributions paid and have a yearly average of at least 20 contributions, or 24 in the case of a retirement pension registered since January 1953, when the unified system of social insurance came into effect, or the time they started insurable employment, if later.
In relation to entry to the system at least ten years before pension age this condition has been a feature of the scheme since it was introduced in 1961 and its objective is to link entitlement to pension with a reasonable level of contributions to the social insurance fund.