• Data reference period
• Geographic localization (Portugal)

• ACTUAL SOCIAL CONTRIBUTIONS:  Actual social contributions consist of: a) employers' actual social contributions; b) employees' actual social contributions; c) social contributions by self-employed and non-employed persons.
• IMPUTED SOCIAL CONTRIBUTIONS:  Imputed social contributions represent the counterpart to unfunded social benefits (less eventual employees' social contributions) paid directly by employers to their employees or former employees and other eligible persons without involving an insurance enterprise or autonomous pension fund, and without creating a special fund or segregated reserve for the purpose.
• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.
• GROSS DOMESTIC PRODUCT:  Final result of the production activity of resident producer units that can be defined according to production approach, expenditure approach and income approach.

 (Receipts from taxes and social contributions/ GDP)*100