Cost Sharing an Apartment (Tax Implications?)

[Calvin Kwon]

I have a spare room in a 2BD/2BA apartment. I rent the apartment unit and I am looking to rent out the extra room. I was going to use the two rooms for myself, but decided to rent out the spare room. What are the tax implications, if any, of renting out the spare room? All the posts I have seen are for house hacking scenarios when the owner is renting out a unit/room that he or she owns.

Thank you for your advice!