Guess I am a little more cynical than most who have weighed in. Just my opinion, but having had kids, grand kids and hundreds of students (as former HS teacher) at that age, "train wreck" is the only thing I can imagine. Any accessible money will be spent (even IRA money, eventually). Hopefully, wasting the $500k during youth will bring a lifetime lesson, and LBYM future lifestyle.
Speaking only to the men here, guys, how many of you would have saved and invested the money at age 18? How many of you had friends that would have been able to do it? Apartment rent, eating out, extravagant dating and new cars beckon. The money will never run out-right
I agree with the "don't offer advice unless asked by the kid" group. This won't be pretty.
If it's probably going to happen with advice, it almost certainly will happen without advice, don't you think? So why not offer advice? Just don't take it personally if it's ignored. And don't be too pushy. Make suggestions, and lead him to conclusions as best you can, but don't dictate.
IMO a rough budget is the way to start.
- Is there anything you want now? (play it by ear, if he keeps it pretty small, like a new laptop, maybe a basic car, etc, take that out of the $500K and continue on. If it's big, just say, ok, let's see how that works out.)
- How much do you need to set aside for college? OK, do you think you'd want to set that aside in a very safe place, making a bit of interest but little or no risk?
- How much do you think you'll want each month during college for living expenses? OK, to do that, you'll need to put away a lot of the rest of the money and you can take out some of the dividends and let the rest grow, so you'll have more after college, for a house, or a start on retirement, or whatever. (Here's a good chance to see if you can back him off too much stuff now if he's gone overboard.)
Talk about the trustees $10K cut, and how he can avoid it if he does it himself. Or maybe he's better off with the funds at the trustee where its more work to get at.
Then you can start talking about the best way to invest it. For the college money, maybe VG Prime MM or similar will get him decent interest while being very safe. For the bulk of the money, explain index vs managed funds, and if he likes the index concept, suggest VG Total/Intl or similar for investing. For each thing, explain the concept and alternatives, and get buy-in from him rather than just saying "this is the best way". And talk about the long-term, not to be upset with short-term drops, but rather what happens when you buy high and sell low reacting to the market.
I dunno, that just seems the best approach to me, rather than giving him a solution like VG or a lifestyle like MMM before even helping him figure though for himself what his goals should be and setting a budget. Then you offer solution alternatives. The more it's his idea, the more likely he is to stick with it.