I don't understand your concern. Did you take a distribution from the 529 account in January this year that was used to pay a qualified expense (tuition) for your son this year? If that's the case, it doesn't matter that the distribution was sent directly to your bank; it's not taxable income for either you or your son, even if you can't claim your son as a tax dependent this year. And if for some reason it's not considered a qualified distribution, only the earnings portion of the distribution, not the whole amount, would be subject to tax and the 10% penalty, if no penalty exception applies.