That's what I do; all expenses on 1 Sched C.  

My guys are smart:  Both have real estate licenses.  They net about $200,000 a year.  Their Broker alternates years: Odd years the 1099 is to H; even years to W, so they both get credit for future SocSec.  Each year I flip the Sched C from 1 spouse to the other.