Even with the local regime mapped and a foreign tax credit lined up, the U.S. side hides traps that surface years later — usually at refinance or sale.
The foreign-currency mortgage If you finance the property with a loan denominated in the local currency, that loan is a foreign-currency transaction under IRC §988. When you pay it off or refinance, the IRS compares the dollar value of the debt when you took it on against its dollar value when you discharge it. If the dollar has strengthened, the loan shrank in dollar terms — and that “saving” is a foreign-currency gain taxed as ordinary income, even though you never received a cent of cash. The asymmetry is vicious: on a personal-use property, a currency loss on the same mortgage is a non-deductible personal loss. Heads the IRS wins, tails you lose.
Example. You borrow 400,000 euros when the euro is worth $1.20 — an $480,000 debt. Years later you refinance when the euro trades at $1.05, making the same debt worth $420,000. You have a $60,000 ordinary-income currency gain, due in the year of the refinance, with no sale and no cash in hand to pay it.
Your gain is measured in dollars The taxable gain on the property itself is also a currency story. Your basis is the purchase price translated at the exchange rate on the purchase date; the amount realized is the sale price translated at the rate on the sale date. A weakening dollar can therefore manufacture a taxable U.S. capital gain even if you sold for exactly what you paid in local-currency terms — and a strengthening dollar can quietly shrink a gain you thought you had earned. You are taxed on the dollar result, not the local one.
Section 1031 stops at the border U.S. investors lean on the IRC §1031 like-kind exchange to roll gains forward untaxed. It does not reach across the border: IRC §1031(h) declares that U.S. real property and real property located outside the United States are not of like kind. You cannot exchange a U.S. rental into a foreign one, or the reverse. (One foreign property can still be exchanged for another foreign property.)
Don’t buy it through a foreign fund Owning foreign real estate directly, or through a U.S. entity, preserves the treatment described above. Buying it through a foreign REIT or a pooled foreign real estate fund almost certainly drops you into PFIC territory, whose punitive interest-charge regime can swallow much of the return (section “Foreign Mutual Funds and the PFIC Tax Minefield”). The convenient-looking wrapper is often the most expensive way in.