Hi ! and sorry for the quick message.
I need to provide my tax number immediately, and reviewing a letter I received from the Stadt Zurich / Steureamt, (Quellensteuer auslandischer arbeitnehmer).. I can't decide or choose which pne is the number.
There is a RegNr with 11 number : 78X.XX.XXX.XXX
and a AHVN13 with 13 number: 75X.XXXX.XXXX.XX
and a PID in this format and 8 digits: 2X-XXXX-XX
Which of the above would be the official tax number to provide?
Thank you again and apolgies for the rush!