True, it’s somewhat easier without a child. They would pay $1500-$2000 more in federal taxes. I insist on $200/month utilities. I’m paying 120-140 just for water and electricity. Unless they lead a spartan lifestyle without TV, Internet, and mobile phones, it would be tough to stay below 200.
20% in MM would be around 80k.
Anyhow, the point is that the “cost of living” in San Diego is around 50k-60k for a couple without children, closer to 70k for a couple with one child. Anything you make in excess of that, you can save. Therefore it’s incredibly easier to save when you make 150k than when you make 80k.