I made this little thing to sort out what is a knight income. The basic template is household knight/man-at-arms. Whats funny about this one is that I'm using Suzie Orman's rule of thumb that your household expenses should be 40% of your income (which i roughly translated as 50% cost of living). She says that if your spending beyond this for just household expenses your living beyond your means.
what has changed compared to my other incarnations of such is that I've more sources and my assumptions are more plainly stated. Also there is some symmetry in the numbers.
I will go into Household expenses more in detail in this google doc.