Based upon the facts that you have provided, I do not believe that you should have any gift tax liabilities. The bank may be requesting you fill out a return in order to satisfy its reporting obligations in the event that the share of the house received was not equal to the consideration granted. If no gift is being made and the bank is requiring a return, it should be sufficient to file a return reporting a $0 gift.
Answered on Aug 13th, 2013 at 7:15 PM