Lowering DTI via SFH

[Joseph Nguyen]

Hey all, 

I'm new to investing,. I currently already have a primary home, SFH, in which I rent by the room. I was wondering if I acquired another SFH via traditional investment loan, and either rented whole house/by the room - would the income count towards lowering my DTI? (assuming the cash flow is higher than PITI).

My second question is if I acquired a duplex via seller financing, would that also decrease my DTI? I'm unsure since from what I understand the seller would still maintain title and name on mortgage correct.

TIA!