I live on 1/2 of my main property and rent the other 1/2, can I deduct 50% under the mortgage deduction summary

[Phillip1 · Accepted solution]

Yes. 

In cases where you rent part of your primary residence, you are required to divide all your rental and personal deductible expenses between rental and personal usage. 50% of your mortgage interest would be deductible as a rental expense, and the other half would be deductible as the home mortgage interest expense deduction on Schedule A.