Hi I have been an aupair in Switzerland for 3 different families and have encountered a problem with my last family. It's regarding the witholding tax. I know it is meant to be deducted from an aupairs salary, however my problem is my family have the last bill and want me to pay for it now that I have left. I have never had a family tell me I owe them money in tax before. If my family had taken anymore money from my wage, I would have been working for free, also they made a saving by not paying me more for the 45-50hrs I worked weekly as I believe they would have had to pay a higher wage plus taxes for me and pension (as it were explained to me). My question is legally who is responsible to pay the remaining witholding tax?
As much as the situation sucks for me, I would like to do what is right and fair.
Thank you.
Also if it helps I am a EU cit.

First, if you were working 45+ hours per week, you were not an au pair. There is strict work hours, including language classes, etc for an au pair, and generally you also have to go through an agency.

If working as a nanny at au pair salary, you were definitely being taken advantage of. Did they pay your AVS, other social deductions? Not sure what you mean by witholding tax?, but presumably they did pay their share of insurance, AVS, others? I would ask them for clarification on what the money is for and compare to what you have already had deducted. If AVS or insurance, best to go to those agencies directly.