I did this kind of thing when I was in high school! The best thing I did before I graduated was buying a reliable car. I was driving a 2002 bug that only started about half the time, but a few months before graduation I had enough saved to buy a 2013 that is with me today. I had a couple times where I thought homelessness would be a possibility, but my saving grace was always thinking “at least I have a car”. For rent, I suggest having more than first, last, and deposit. That’s usually required up front, which will leave no wiggle room. I would add in another month or two. Have him get his own phone plan when he turns 18 so he can start building credit. Then see if (when he has enough money to pay it back) he can get a small personal loan to continue building credit. I don’t know if it goes against the rules of fostering, but my parents made me start paying them “rent” when I turned 18. It was $200 a month, and when I moved out they have it back to me and I had $2400 that I didn’t know about and wasn’t expecting. With him being fostered, I don’t know if you would be able to do that or not. Maybe go about it a different way and make that the emergency fund and let him watch it grow. Side note- whether he joins the military or not (but especially if he does) PLEASE make sure he understands how the real world works before turning him loose. Let him sit with you while you pay bills, take him with you to the bank when you fill out deposit slips, make sure he knows how to write a check and file his taxes. If he does join the military, he’ll be living in the barracks getting a paycheck with almost no expenses so it’s very easy to go astray and start spending money on stupid stuff and lose your savings