it is now 28% of our gross salary. It is a lot--by far our biggest expense. We are pretty frugal in other areas though--no big vacations, cars, clothes, no ipad, etc. We still manage to save for retirement and have two kids in childcare. we both work full-time and wish we could scale back, but it didn't look like we'd have any part time options anyway with our careers in the near future, so we got the house we wanted. It is inside the beltway in a good school system so it has retained its value and even probably grown in value since we bought 5 years ago.