I assume that 15 minutes doesn’t include compiling and categorizing all expenses...? That’s what kills me, time-wise. Computer or no, each has to be entered into a spreadsheet or whatever, one at a time.
I do agree with you though, that a lot of people in $100k - $150k houses end up paying significant Federal income taxes.
I do it as the year goes by with the rentals in binders so its all organized. I use hrblock online every year so it rolls most of my data automatically.