US citizens and US green card holders have unique filing obligations, unlike citizens of other tax jurisdictions. The US imposes taxation based upon citizenship/green card and not based on tax residency. There are certain tax optimizations that do not make sense if you have US filing obligations. Our specialized team is aware of this and is closely working together with several US tax preparers in Zurich. As the Swiss tax declaration is always needed as a starting point for your US declaration please remember to get in touch with us on time to make sure you're also able to meet all US deadlines.