Note: Use a text editor such as notepad to edit the "House" file in the "\Program Files\EA SPORTS\FIFA MANAGER 10\private_items" directory. This file contains the types of homes and how much they cost. Change one of the values to a negative number. For example:

Palace,Palais,Schloss,Palacio,Palazzo,Palac,-912000000,palace.bmp,2005

In the game, go to "Career" then "Private Life", then "House". Buy the house that was modified (for example, the Palace) and you will gain that amount of money instead of losing it.