oversea mortage questions

Hi Team

 

I want to ask about the oversea mortage questions. 

 

1. Do I need to report my oversea mortage to Fbar or 9838 form ?

 

2. I assume oversea mortage is an option to report but not complusory?

 

3. I think we may want to report it only when the total oversea interests are above the tax allowance we can credit?

 

Thanks for the help