Do not choose a broker by trading fee alone

A low trading fee is attractive, but tax reporting can cost time and money. Swiss residents need usable annual statements, income breakdowns, positions, and sometimes data for foreign withholding tax relief.

If a broker makes it hard to identify dividends, withholding tax, fund income, or year-end values, the cheap account may become expensive at tax time.

Expats should also ask whether the broker supports the tax forms they need, including foreign withholding documentation where relevant.

Another practical filter is language and support hours. If a tax question arises at 16:00 Swiss time and the broker's support team is in a different time zone with limited English or German, resolving it can take days. A Swiss-based or EU-regulated broker with multilingual support and Swiss tax-form familiarity can save significant administrative time over a multi-year holding period.

DA-1 and foreign withholding tax

Foreign dividends may suffer withholding tax in the source country. Depending on the country, treaty, and Swiss tax filing, part of that tax may be creditable or recoverable.

In Switzerland, DA-1 is often discussed in this context. The exact process depends on canton, tax software, security type, and documentation. The key point is to keep clean records from the start; the DA-1 explainer covers that workflow in more detail.

Do not mix this with the Swiss 35% anticipatory tax. Swiss withholding and foreign withholding are different problems, even though both reduce cash received. If the account is outside Switzerland, also check the foreign assets declaration guide.

Currency risk for mobile professionals

Many expats earn CHF, invest globally, and may retire or relocate in another currency. That is not a reason to avoid investing, but it is a reason to know what currency risk you are taking.

A global ETF may trade in USD, report in another currency, and hold companies earning revenue worldwide. Your broker account currency is only one layer; the currency risk guide for expats explains the planning side.

A practical portfolio note should say what you earn in, what you spend in, what you may need for relocation, and what currency your long-term goals are likely to use.

Also check whether the broker can export reports in a format that matches your Swiss tax workflow. A portfolio that is easy to buy but hard to report is not really simple for a resident taxpayer.

Before transferring a large portfolio, download a sample annual statement and ask whether it separates income, withholding, positions, and transactions clearly enough for your canton.

Account protection and deposit insurance

Swiss bank deposits up to CHF 100'000 per client per bank are protected by the esisuisse deposit insurance scheme. Securities held in custody are not bank deposits; they are segregated client assets that sit outside the broker's own balance sheet. In a broker insolvency, segregated securities should be returned to clients separately from the bankruptcy estate.

For internationally regulated brokers, check whether your assets are held under the Swiss regime, the EU investor-compensation scheme (up to EUR 20'000), or the US SIPC framework (up to USD 500'000 including a USD 250'000 cash limit). The protection level, coverage limit, and claims process differ materially. An internet broker registered in one country may custody your assets in another, so ask explicitly where your securities actually sit.

Currency of custody also matters. If you hold USD-denominated assets with a US-based custody chain, your protection may involve different regulators and insolvency procedures than CHF-denominated assets held with a Swiss custodian. This distinction is rarely visible in a marketing brochure but matters in the unlikely event of a broker failure.

Expats should also confirm whether their broker reports Swiss tax-relevant data automatically or requires manual extraction. A broker with strong account protection but weak tax reporting can still create compliance headaches for a Swiss resident taxpayer. The ideal broker scores well on safety, tax documentation, and cost—not just one of the three.