My mortgage interest received is already prorated for my Airbnb expense. Do I put the full amount under mortgage deduction or should it be reduced by the amount already used?

[gianna-n-reese]

This is my primary residence, I rent out a room on Airbnb.

[DanielV01]

You are correct.  You reduce the interest you can deduct on Schedule A (itemized "personal" deductions) from the amount of the mortgage interest you took on your rental.  You actually get a little more deduction this way because the portion used for your rental income is a full deduction, whereas the amount you claim on Schedule A is dependent on whether your itemized deductions are greater than your standard deduction.