Effective social contributions by employers (D.6111) (these contributions correspond to flow D.121)
Effective social contributions by employers are payments they make to social security administrations, insurance companies and autonomous and non-autonomous pension funds that administer social security systems, with the aim to ensure the provision of social benefits to salaried workers.

Social contributions by salaried workers (D.6112)
These are social contributions that salaried workers pay to the social security and to private systems with and without constitution of reserves.

Social contributions by autonomous workers and the unemployed (D.6113)
These are social contributions paid in their own benefit, by persons who are not salaried, i.e. self employed workers (employers or self employed workers) and the unemployed.