The use of SIA to record the ruling messages to be exchanged requires the registration via the portal myTaxWorld.


For questions regarding the procedure, the «User Guide myTaxWorld - Login and problem solving» (in german, french or italian) describes the procedure for creating a user profile step by step.

The registration process is completed as soon as the SIA platform can be clicked on on the myTaxWorld home page.


Last modification 23.09.2019

Top of page


Federal Tax Administration
Main Division DAS
Division for exchange of information in tax matters
Eigerstrasse 65
3003 Berne

Contact form

+41 58 462 71 72


Print contact