Schedule A Deductions

Mortgage Interest to foreign banks:
Mortgage interest that is paid to a foreign bank can be deducted on a resident's Schedule A if the home is located in a foreign country. 
Mortgage interest that is paid to a foreign bank can be deducted on a resident's Schedule A if the home is located in the US but the resident must file form 1042-S and pay a 30% withholding on the payment to the IRS. Also check the tax treaty that is tied to the foreign bank.