Before you read another word about U.S. taxes, absorb this: the property sits inside another country’s legal system, and that system — not the IRS — has first claim on it. The single most important step in a foreign purchase is to engage a local tax advisor and a local real estate attorney before you sign anything. The property, its transfer, and its inheritance are governed by the law of the place it sits (lex situs); your U.S. will, your U.S. trust, and your U.S. instincts may not survive contact with it.
What ambushes American buyers is rarely the income tax — it is the costs that have no clean U.S. equivalent:
Many countries levy a one-time tax on the purchase itself, frequently 5–10% or more of the price — an immediate, unrecoverable haircut on day one that no U.S. spreadsheet thinks to include.
Countries such as Spain and France tax the value of real estate every year, not merely the income it produces. A property that cash-flows well can still bleed from a recurring levy on its market value.
Some jurisdictions tax non-resident owners at higher rates, deny them deductions that residents receive, or impose extra withholding on rent and on sale proceeds.
New construction may carry value-added tax; municipal and property taxes vary widely and are easy to underestimate from abroad.
Two structural issues can stop a deal cold. First, foreign-ownership restrictions: some countries bar non-citizens from owning land outright — Mexico requires a bank trust, a fideicomiso, for property in its coastal and border “restricted zone,” and others cap or prohibit foreign land ownership entirely. Second, currency controls: a country that welcomes your money on the way in may make it slow, costly, or difficult to repatriate rent and sale proceeds on the way out. Confirm both before you fall in love with a listing.