Yes - my biggest concern with moving money after 4 months is that if I had made any money, it's a short-term capital gain. My (taxable) money is roughly split 50/50 between Vanguard and Betterment, and it will stay that way for the next couple of years, but after that I will probably decide either a) I'm comfortable making occasional rebalances or b) I just want Betterment to do the tiny bit of work for me and I'm willing to pay for it. On my own (i.e. my Vanguard) I am not properly diversified. I just own lots of VTSAX. Also, Betterment should, within a couple years, have an glide option to automatically, slowly over time (as you approach goals) change your allocations from stock heavy to slightly more bond heavy. That might be interesting.