• Data reference period
• Place of residence (Portugal)
• Earnings components
• Institutional sector
• Economic activity (Section - CAE Rev. 3)

• LOCAL UNIT:  An enterprise or part thereof (e.g. a workshop, factory, warehouse, office, mine or depot) situated in a geographically identified place. At or from this place economic activity is carried out for which ' save for certain exceptions ' one or more persons work (even if only part-time) for one and the same enterprise.
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• ECONOMIC ACTIVITY:  Combination of resources such as labour, raw materials, equipment, etc., are joined, leading to the creation of specific goods or services. Regardless of the factors of production integrating the good or service produced, all activities generically imply an input of products (goods or services), a production process and an output of products (goods or services).
• BASIC REMUNERATION:  The gross amount, before deduction of taxes and social security contributions, in cash or in kind, paid regularly in the reference period and corresponding to the normal working period.
• INSTITUTIONAL UNIT:  The institutional unit is an elementary economic decision-making centre characterized by uniformity of behaviour and decision-making autonomy in the exercise of its principal function. A resident unit is regarded as constituting an institutional unit if it has decision-making autonomy in respect of its principal function and either keeps a complete set of accounts or it would be possible and meaningful, from both an economic and legal viewpoint, to compile a complete set of accounts if they were required.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).
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• INSTITUTIONAL SECTOR:  Group of institutional units which have a similar type of economic behaviour.

Total gross monthly earnings per employee = Total gross earnings (all components) paid by employers on month m / Number of employees on month m