I'd always heard no more than 30% of your monthly income (gross, not actual cash after taxes have been taken out) should be spent on housing. We're looking to buy for the first time and I'm trying to figure out what a good conservative estimate should be for our mortgage payment to see what we can really afford. 30% sounds like a lot to me, especially given that I live in a *very* high-tax area of the country. Wondering what others do--if you live in an expensive city/state, do you adhere to this rule, or do you think it's safer to go lower?