After working a lot you have the chance to have fun with your own earned money.
But some people prefer to keep their money on a safe place. Every house is equipped with a safe with a maximum of $1.000.000 once you managed to fill up the safe you can either upgrade your safe to 5, 10 or 50 million. Money can be taken from any safes in your houses and you cant lose stored money in safe. (they saved to your account, not to house) You can aswell keep the money on yourself.