Foreign property (real estate) taxes aren't deductible on tax year 2018 through 2025 returns due to the Tax Cuts and Jobs Act. This rule applies to a personal residence or second property. In 2017 and prior years, foreign property taxes could be deducted. Property tax deduction on foreign rental properties are subject to the same rules as your US rental property.
You can still deduct the mortgage interest on schedule A on foreign real property that is your personal first or second home, assuming you meet the limitations on interest deductions for personal residences and second homes
The maximum amount of taxes that can be deducted on Schedule A (for personal residences) plus state income taxes, vehicle license plates, sales tax, etc is limited to $10,000 per year for 2018 and beyond.
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