The A1 Posting Confirmation is a European form which shows which country are paid social security contributions.
The standards ISO 4400-1 and 4400-2 will be explicitly recognized that a
Check-lending construction employing workers with A1 certificate of posting is not available again propose the employer the worker made available to him by a third party to operate under its supervision and direction (by borrowing). Closes the norm in European legislation.
The proposed amendments have been adopted and will come into force on 1 July 2013. This tightening of the standard SNA will prevent misuse of the A1 certificate of posting.