With the recent insurance law, a Unified Social Security Fund - E.F.K.A. has been established, which includes both employees with a salaried employment relationship (salaried employees) and certain categories of self-employed individuals - freelancers. That is, almost all individuals subject to mandatory social security. At the same time, many provisions of the insurance legislation have been amended, mainly concerning the method and inclusion in insurance, contribution rates, the increase in retirement age limits, and the conditions for granting pensions, as well as the calculation of their amount, national-contributory pension, supplementary insurance, employment of pensioners, granting of temporary pensions, pension adjustments, payment of E.K.A.S., parallel insurance, voluntary insurance, sequential insurance, multiple employment, civil partnership, pension adjustments, contribution reductions, etc. Following the above, it was deemed necessary to issue a new edition, which is not only fully updated but also richer in new topics and interpretative comments. In addition to the above, the relevant case law of the Administrative Courts and the Council of State was included, which authentically interpreted many provisions of the insurance legislation, to provide as complete a picture as possible of the issues examined. At the same time, detailed tables of contribution rates applicable throughout the country are provided for all categories of businesses and insured individuals. The edition is supplemented with many footnotes, which correlate the provisions of the legislation and the relevant case law, to provide the basic elements of Social Security in a unified and concise text. At the end of the work, there is a detailed index of entries.