@rehsifgnik , Agreeing with the short and to the point answer by @Critter-3 to your questions, I just wonder about the whole situation because there are lot of assumptions we are making for the answer --- (a) are you US citizen / Green Card ; (b) is/was this home your main residence for the tax year; (c) is your taxhome in that country where the home is located; (d) which country etc. etc.
It is not important that this is the only home you own --- only that you use it as your main residence and that your tax home is in the same place. For example , you could live in the USA ( taxhome USA) in a rented home ( as your main residence ) and have a second home in Costa Rica ( for example ) where you plan to retire eventually. The mortgage interest is still deductible while you live in the USA as second home ( within applicable limits ) and as main home ( and for gain exclusion purposes ) when you go and retire there.
For your reference , ---> https://www.irs.gov/faqs/itemized-deductions-standard-deduction/real-estate-taxes-mortgage-interest-...
and of course ---> https://www.irs.gov/pub/irs-pdf/p936.pdf
Please answer the questions raised above -- the general type of answer can be more focused to your situation.
pk
