Saving money for taxes

[Colin Carr]

I was watching the video Brandon Turner did for analyzing a deal recently and got to thinking. When you own a rental and are collecting money from it, I'm assuming the government sees that as income, and presumably wants a cut of it. However I never saw Brandon outline taxes (specifically for income, not property). I own a duplex, house hack and I take off about 15% assuming at the end of the year I will be taxed. Obviously this eats into my cash flow, but I haven't heard of it from anybody else.

Is anybody else doing this? If not, am I doing something wrong? Also note, I'm hoping that depreciation and mortgage deductions will eventually make wash out any extra income I'm making in which case I'll have a nice bonus come tax time.