The cost advantage
A foreign broker may charge little or no custody fee and low commissions. Swiss securities transfer stamp duty is generally linked to transactions involving a Swiss securities dealer, so trades through a purely foreign broker can fall outside that mechanism.
For the surrounding context, see Swiss banking hub.
If this decision changes the viability or sequence of your move, a Swiss relocation strategy consultation can apply it to your own facts.
Which foreign brokers accept you at all depends on your residence, not on your money. FreedomBanking compares international brokers that take non-residents.
The work you take back
You must provide the Swiss tax return with year-end values, income and other required data. Not every foreign broker produces a Swiss-format tax statement.
Foreign withholding taxes also need active management. For US securities, a valid W-8BEN generally reduces US dividend withholding from the statutory 30% to the treaty rate of 15% for qualifying Swiss residents. The Swiss DA-1 process can then provide relief/credit for treaty-eligible foreign withholding, subject to its rules.
Operational risk
Broker policies can change. Product access may be restricted for Swiss residents or US persons. Client assets may be protected under a foreign legal system rather than Swiss custody law.
For the surrounding context, see opening a Swiss bank account.
The sensible approach
Keep a foreign broker because it is better for cost, product access or diversification, not simply because changing is inconvenient.
For the surrounding context, see choosing a Swiss bank.
The price advantage is not free
A foreign broker can save Swiss transfer stamp duty where no Swiss securities dealer is involved and can offer lower commissions and tighter FX. In return, you may lose the clean Swiss tax statement and local service that makes annual compliance easy.
For a simple ETF portfolio, that trade can be attractive. For private-company shares, derivatives, multiple currencies and complex foreign withholding, the annual tax-data work can become meaningful.
Jurisdiction matters in a dispute
Client securities are generally segregated under the relevant custody framework, but a dispute, insolvency process or complaint occurs under the broker entity’s law and compensation regime. Confirm which legal entity actually holds your account, not merely the brand on the app.
Re-check the broker after every move
International brokers change product access and servicing policies when clients change country. A relationship accepted for a Swiss resident may be restricted after a future US, UK or EU move.
Treat the foreign broker as one layer of your custody architecture, not as an institution you can assume will serve you forever.
General information on Swiss law and practice, not individual legal, tax or investment advice.
