TaXperts

TaXperts is based in Basel and also serves clients in Zurich, Zug, and Lucerne. The firm deals only with individual taxes and does not take on companies, with clients split between expats, locals, and cross-border commuters. Alongside Swiss returns it handles US tax and global mobility cases, so someone arriving with income or filing duties on both sides has a single point of contact. The site is available in English and German.

Documents are exchanged through an online portal with end-to-end encryption, with data held in a GDPR-compliant cloud, and pricing is quoted up front with no hidden fees.