Apostille stamp on IT return

Does anyone have experience with this? How does one get one's IT return with an official and original signature? Or does the printout need to be notarized prior to the apostille?

IT return? What's that? Sending a mouse back to microsoft?

Wild guess - Income Tax

https://www.zh.ch/de/politik-staat/beglaubigungen.htm

Any document must be notarized BEFORE getting the apostilla.

Tom