To qualify for old age (contributory) or retirement pension, a person must have entered insurance at least ten years before pension age; have at least 156 contributions paid (from April 2002, this will increase to a minimum of 260 paid contributions and to a minimum of 520 from April 2012), 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 commenced insurable employment, if later.
In November 1997 this minimum yearly average requirement was reduced from 20 to ten contributions per year, leading to a pro-rata pension. Where a person has a yearly average of between ten to 14 contributions, they are entitled to a pension rate at 50 per cent of the standard maximum rate while those with averages of between 15 to 19 receive a pension rate equivalent to 75 per cent of the standard maximum rate.
In recognition of their special circumstances, the qualifying conditions for the widow(er)'s (contributory) pension are more flexible than those outlined above.