Hi Pospisil, unless in other countries like France, UK, Germany, there are no tax deductions / benefits for Startup investments in Switzerland. Generally speaking, if you really bought shares any gains or losses will be considered capital gains / losses (= tax free). There are many pitfalls though when it comes to startup investments and very often it is advisable to talk to the tax authorities and get a ruling, that clarifies the tax situation. Strongly advise to talk to an expert about your specific situation.