The latest publication, "Steuerinformationen", prepared by the Federal Tax Administration and published by the Swiss Tax Conference (SSK), presents in tabular form the current cantonal regulations regarding the publicity of tax registers.
Only in the cantons of Fribourg and Neuchâtel is there a public edition of the tax factors (limited to 60 days in the canton of FR).
In principle, the majority of the cantons do not provide for a public tax register or a right of inspection for third parties.
The following cantons provide for a fundamental right of inspection: ZH, BE, FR, SG, VS, NE.
In the canton of Zurich, taxpayers can have their data blocked in the tax register. Third parties can then only demand the surrender of the tax factors in qualified circumstances.
Further information can be found in the January edition of the tax information
(source: https://www.estv.admin.ch/estv/de/home/allgemein/steuerinformationen/fachinformationen/schweizerisches-steuersystem/dossier-steuerinformationen.html )
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