Are AHV and regular (not overpayment) 2nd pillar pension fund payments deductable from brutto income? Do they reduce "steuerbares Einkommen"?

If you fill in a tax return yes, if tax deducted no as it's assumed you have deductions of 10-15k

I am not sure I understand. Could you please clarify second part? "[...]if tax deducted no as it's assumed you have deductions of 10-15k."
Does it mean that I should do fixed amount deducation from the brutto income?

No it's assumes which is why if you put the income into a normal tax calculator you would pay far more tax, drop the income by 12k & it looks close.

I attached an example of a Lohnausweis. It shows the annual income and is used to fill in the tax forms. As you (hopefully) can see (I can't attach bigger pictures), the AHV (point 9) and 2te Saule(point 10) are deducted from the gross income (bruttolohn, point 8), so the nettolohn (point 11), which is filled in the tax form, already has the AHV and 2te Saule discounted.

Hope this helps!?
Erik

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I understand. Only if I did voluntarily inpayments for 2nd pillar then I could do additional deductions in Steurererklarung "weitere Abzüge: 16.1 Beiträge an die AHV, IV un 2. Saüle, sofern nicht unter Ziff. 1 und 2 abgezogen"?

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Exactly!