If his name is on the title to the property he can deduct the interest but only if he itemizes. if his standard deduction is greater than his itemized deductions, then the interest deduction will be of no benefit.
The standard deduction for a single taxpayer is $14,600. Some taxpayers can determine which is best without entering the details of their itemized deductions. If he can not, then he should enter the mortgage interest and other itemized deductions. Turbotax will optimize.
