My roommate paying me for the room, is considered income?

[Natalia Davis]

When I will be renting a room or basement in my house (that I will be buying as primary residence), I’m planning for the roommate to just zell me the monthly rent directly to my back account. Are this funds taxable, do I have to declare them as extra income on my taxes. What’s the legal way to collect payments from roommates that live with me in the same house?