I'm in a Pendragon 5th Edition campaign right now, and the question has arisen about actual take-home annual income for a knight.
It says as a standard Knight you make between 6 and 8 Libra per year, but it does not specify how much of that (or if all of that) is absorbed into the expenses of trying to run your holdings, estates, servants et al.
How much of that 6 to 8 Libra actually goes into a treasury for later use - like building a new wall to hold of Saxon invaders?
//Panjumanju
My understanding of the core rulebook is that that money is all money you personally earn. The "money you never get to see" - the stuff involved in keeping the manor in good order - is abstracted out and the player decides how much they're going to spend on maintaining their household (including children and horsies).
Later supplements tweak this depending on exactly how much manor micromanagement you have the appetite for.
That's how it worked as far as I ran it in the great pendragon campaign. Though there were more advanced rules in the Book of the Manor supplement that were much more interesting and detailed (though if you aren't very interested in that aspect of the game, it can prove tedious for you).
RPGPundit