We are on one income and our proportion is 50% as we also have an investment property that we have to top up as well and it works for us. I think financial advisors might recommend no more than 35%ish. Having said that it depends on your lifestyle habits too. We make it work because we moved to the country and our extra curricular stuff is cheap here so we don't spend as much on weekends etc. but we have also saved on petrol etc. We also don't eat out as much as we used to, not because we can't necessarily but we don't really want to (plus choices are limited!!) If you have a long commute to work, etc you need to factor it all in. Maybe do a budget and see what works for you once you take everything else into account. I would buy over rent but that is just me!