You are allocating costs for the office based on sq ft ratio of office to the total home. The interest expense number will be different . Interesting point that the cash out portion should not be attributed to the house costs even though it is tax deductible. Moot point after 2017 .
Disclaimer: Not a tax professional. Information gathered from internet links. Anything dated in June 2019 was posted in prior years and is before the 2019 limits and changes.
