Key legal question
Whether B.Y.'s mortgage interest payments can be deducted by A.X. as her debt interest or debt burden.
Extracted holding
No. Only the person personally and finally liable for the debt may deduct the interest; that was B.Y., not A.X.
Extracted reasoning
The mortgage debt was solely in B.Y.'s name. Since A.X. did not owe the loan, the previously allowed deduction in her assessment had to be removed.