Cross-Border and Multi-Currency Lending

For households with international exposure — expat assignments, foreign real estate, dual citizenship, or balances at a global private bank — the option set expands to multi-currency lines of credit. The strategy that draws the most press, and causes the most damage, is the FX carry trade.

The FX carry trade loan. Borrow in a low-interest-rate currency (historically the Japanese yen or Swiss franc, both of which sustained near-zero policy rates long after the dollar tightened), convert to dollars, and invest the proceeds in higher-yielding dollar assets. On paper, you capture the rate spread — say, 1% on the yen loan against 5% on the dollar investment — for 4% of essentially free carry.

The risk that destroys this trade is foreign exchange, not interest rates. If you borrow 10 million yen at $1 = ¥150 and the yen subsequently appreciates to $1 = ¥120, the dollar value of the debt you owe has jumped 25% — erasing years of carry in a single move. The yen appreciation of mid-2024, after the Bank of Japan ended its negative-rate policy, wiped out a large body of carry-trade positions almost overnight. Carry trades are a leveraged bet on the exchange rate, not on the rate spread, and currencies move in ways that no interest-rate model captures.

The right use of multi-currency credit for most cross-border households is not carry but currency matching: if you own a London flat, borrow against it in pounds so the asset and the liability sit in the same currency and the debt has no FX exposure regardless of where sterling moves. If you have only dollar income and dollar assets, borrow in dollars. The carry trade is a position for institutional balance sheets with explicit currency-risk mandates, not for personal ones.

Jurisdictional booking. Where the loan is documented and which entity holds the collateral matters more than the headline rate. Two structural plays appear repeatedly in large balance sheets:

• Trust-based asset protection. Holding the collateralized assets in a Delaware, Nevada, or South Dakota self-settled asset protection trust insulates them from creditor attachment, divorce, and lawsuit exposure under those states’ favorable trust statutes. The credit facility lends to the trust, with the trustee as borrower of record. South Dakota in particular has built a private-bank ecosystem around this structure.
• Offshore booking centers. Large private banks (UBS, JPMorgan Private Bank, Citi Private Bank) frequently book international asset-backed loans through the Cayman Islands, Luxembourg, Jersey, or Singapore. The point is not tax evasion — US persons remain fully taxable on worldwide income — but reduction of stamp duties, intangibles taxes, and documentation costs that domestic-booked loans would otherwise incur. The borrower still reports the foreign account on FBAR (FinCEN Form 114) and Form 8938 under FATCA.

Cross-border and offshore lending magnifies complexity. Use it when the underlying activity is genuinely international; do not use it as decoration on a domestic balance sheet.