What is excess mortgage interest?

If the amount of home mortgage interest you deduct on Schedule A, Itemized Deductions, is limited, enter only the portion of excess that applies to your home office (on the Home Office Only Expenses screen) or as part of the entire home's expenses (on the Expenses for the Entire Home screen). Do not include mortgage interest on a loan that did not benefit your home.

If you know you're taking the standard deduction, you will enter all the mortgage interest for the home used for your business as excess mortgage interest.

Note: Do NOT enter any amounts as excess mortgage interest if those amounts are also included as deductible mortgage interest.