permit C with wife living in Spain, should I fill the form as single?

I married last year, but my wife is still working and living in Spain. I have a C permit as I worked in CH for 7 years.

Should I file my tax form as single? if I declare "married" I have to fill in her salary information which doesn't make sense to me.

Other people in similar situation on the forum mention that they were "taxed as single". But for me, that amounts to a false declaration.

Not sure what to do nor where to ask given my limited german knowledge

Paging member Roegner for help!

You must include her income because as a married resident in Switzerland you cannot file as single. You aren't single, so that would be a red flag from the start.

I believe the income isn't taxed because she doesn't live here, but it is used to calculate the rate that you pay. Something like that.

Exactly that.