Well from my salarie i usually stand with 10-15% after paying all my bills, put some at emergency fund. I had splited with my wife the cost of the house, and each one does able to save some money in the end of the month. But i cant risk yet a lot into bitcoin, since i had cleared a debit i had eating all my salary recently. By January i do pretend to start buying all months some extra bitcoins with the money i will have avaible to invest.