30% Housing Costs: Net or Gross?

I received this question via email, regarding the “30% rule” when making your mortgage or rent payment:
I know that you’re supposed to stay around 30% of your income for housing costs per month. Is that 30% of net or gross, and is that only for the housing, or do they recommend staying under 30% for housing and all utilities?
This is an interesting question without a straightforward answer. “They” say many things, but from what I can tell from talking with some other financial types and consulting my common sense, the basic rule is 30% of your pre-tax (or gross) earnings, …read more