From 1.1.2011, Switzerland will enforce a new Tax Number called UID (Unternehmens-Identifikationsnummer). Authorities will assign new tax numbers to all new tax persons instead of old 6-digit VAT Registration Number. Existing tax persons will be informed of their new tax number in the first semester of 2011. During the period from 2011 - 2013 both old and new VAT Registration Numbers can be used. In first quarter of 2011 we expect further communication from Swiss authorities on potential changes in VAT Reporting related to this change.
Currently in the Swiss version of NAV 5.0 SP1 and NAV 2009 SP1 (and R2) we store tax number in the VAT Registration field in Company Information and in the UID field in the Payroll module. Keep in mind you will need to change VAT Registration Numbers for all your Swiss Customers, Vendors and Contacts.
Some information on new tax Numbers:
We recommend you update the VAT Registration No Formats (Administration-> Application Setup -> General -> Countries/Regions) for country CH (Switzerland) with the following entries: