How to enter rental income for duplex
https://ttlc.intuit.com/replies/3288530
Roommate rental
If this is merely a cost sharing arrangement where the amount paid is below fair market rental, there would be no reportable income to you. However, If the “rent” amount is fair market value, or more and you collect rent from someone who lives in a property that you own – even if it's just a room in your house – you're considered a landlord and must report the rent you receive as taxable income.
How to file rental income from roommates
https://ttlc.intuit.com/replies/5783414
(see attached screenshots)
There's several ways to do this with TurboTax. You'll probably find it easiest and simplest to treat each unit as a physically separate entity. It's really easy if each entity has it's own separate metered utilities. The rental unit is entered as exactly that - a physically separate unit that is 100% business use.
Then for the unit you live in you enter that as a physically separate unit selecting the option for "I rent out a room in my house/primary residence".