National Identification Number - Switzerland

Switzerland

Since the introduction of a national pension scheme in 1948, most persons resident in Switzerland are allocated a social security number (AHV-Nr. / No AVS ), which is now also used for various other governmental purposes. The eleven-digit format in use since 1968 is of the form AAA.BB.CCC.DDD and encodes information about the name, birthdate and sex of its holder:

  • The "AAA" digits encode the family name.
  • The "BB" digits are equal to the last two digits of the year of birth.
  • The "CCC" digits encode the birth day as a trimester number (1-4) followed by the number of the day in the trimester (e.g. 101 is January 1).
  • The "DDD" digits are used to be an origin code depending which country the person came from and or if this person was a Swiss citizen through birth or naturalisation.

As of 2008, a new, anonymous thirteen-digit number is being issued to all Swiss residents. It is of the form 756.XXXX.XXXX.XY, where 756 is the ISO 3166-1 code for Switzerland, XXXX.XXXX.X is a random number and Y is a EAN-13 check digit.

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