If any one notice this news:

https://www.ubs.com/ch/en/help/pensi...lding-tax.html

Do you get any information about this?

BR

You can now request to fill in a tax return regardless of income. If you have a pillar 3a pension, you won't get a tax reduction unless you fill in a tax return.

There are already three other threads on the topic and its consequences

2021 Changes in tax at source reassessment [Kreisschreiben 45]
Withholding tax for part-time employees. New tax regulations for 2021
Question about the withholding tax ( Quellensteuer eidg )