Implementation · security

Securing across two jurisdictions

The US leg is not there to earn more — on return, Europe gives up nothing. It is there for robustness: splitting wealth across two legal systems, so that no emergency measure can reach everything at once. Here is why, then how to set it up from Europe.

On return, the US account brings nothing more: the strategy runs just as well in European funds (see Investing from Europe). Its value is robustness. First — and this is the subject of this page — a second jurisdiction: splitting wealth across two legal systems. Then, as a bonus, setting up the US leg surfaces two protections Europe does not match: a far higher broker insurance (SIPC) and operational flexibility (fast transfers, a cash line).

Two jurisdictions

Holding the US leg at US brokers and the European replica in domestic wrappers splits the portfolio across two legal systems. The point is not immunity — it is a cap: no single jurisdiction's emergency measure can freeze everything at once.

Each side has its own worst-case scenario. In France, the Sapin 2 framework allows authorities to suspend withdrawals — and even internal arbitrages — on life-insurance contracts during a systemic crisis; US accounts know nothing of it. Conversely, measures affecting US accounts would leave the domestic layer untouched.

The asymmetry matters. A European investor lives in euros, so the survival layer — cash buffer, guaranteed funds, domestic income — belongs on the home side. A freeze abroad can be waited out; a freeze at home is the one to design against.

The weak link is the bridge itself: transfer rails (e-money institutions, FX services) carry no deposit guarantee. Treat them as pipes, never as vaults. The failure of one provider is recoverable in degraded mode — direct wires between a broker and a domestic bank do work, at the price of friction, and a named US bank account can be opened with some effort.

More importantly, living off the foreign side requires no transfer at all. A payment card issued on a foreign account spends those funds directly at a European checkout — the card networks convert at the point of sale. A transfer can wait; groceries cannot.

True capital controls are a different animal: they can constrain every rail at once, and no new account bypasses them. That is the final reason each side of the border must be able to live on its own for a while — the survival layer at home, a spendable layer abroad.

Setting up the US leg from Europe

What remains is to set up this second leg in practice. A regulatory wall, the route around it, and the two protections that come with it.

A European investor who wants to replicate a strategy built on US-listed ETFs quickly runs into a regulatory wall. Under the PRIIPs regulation, a US ETF that does not publish a "key information document" in the European format cannot be offered to retail clients by European brokers: neither IBKR Ireland, nor DEGIRO, nor Trade Republic will let you buy a SPY or an IWF. This is not a limitation of your broker — it is the European rule.

The remaining route is a broker operating under the US regulatory framework that accepts non-US residents. Two examples: Alpaca, which combines a full API — suited to programmatic execution like the one described here — with a pleasant web interface, and tastytrade, a well-established platform that also offers an API. Both provide modern interfaces and commission-free trading on US stocks and ETFs, with no custody fees — to be tempered, for a euro-based investor, by the currency-conversion costs (EUR↔USD) on the way in and out. Eligibility, however, depends on your country of residence (most EU countries yes, Canada no, for example), to be checked case by case.

First bonus protection: insurance in the event of broker failure is markedly higher under the US regime. SIPC covers securities up to $500,000 per client (including $250,000 in cash), and several brokers — including Alpaca — add "Excess SIPC" coverage running into the millions; on the European side, the directive's guaranteed minimum is only €20,000 per investor (raised to €70,000 in France, £85,000 in the United Kingdom). One essential clarification: under both regimes your securities are segregated — held apart, separate from the broker's own money — and remain your property, returned even if the broker fails. These guarantees cover fraud or a failure to return assets — not market losses.

That leaves funding. Sending dollars to a US broker from a euro account is often slow, costly, and tends to trigger scrutiny from banks. The tool that unlocks this is Wise, which provides genuine US bank details (account number + ACH routing number) in your name: the broker then receives the transfer as a domestic, first-party deposit — local, fast, usually free. The process is identical at Alpaca and tastytrade: you link your Wise USD account exactly as you would link a US bank.

Second bonus protection: operational robustness. Transfers, both in and out, are fast — liquidity when you need it, where some European brokers count in days rather than hours. And the margin line can act as a short-term cash bridge: raising liquidity without selling your positions — hence without a forced sale into a market dip — where some European brokers reserve margin for buying securities only. Margin is a cash convenience, not a yield lever: it carries interest and exposes you to margin calls; this is not advice.

A margin account changes the protection of your securities only in two cases. First, up to what you borrow: securities pledged for a margin loan can be reused by the broker (rehypothecation), within a regulatory limit (in the United States, 140% of the borrowed balance); with no borrowing, nothing is reused and fully-paid securities stay segregated. Second, if you switch on a stock-lending programme: while a security is on loan it is no longer covered by SIPC — you hold collateral in its place. Such a programme is opt-in as a rule; it can be checked, and turned off, in the account settings.

To reconstruct those euro capital gains — the weighted-average cost basis converted at the exchange rate of each operation — this site has a client-side tool: the multi-currency cost basis calculator (nothing leaves your browser).