Uniform Transfers to Minors Act (UTMA) accounts are owned by a minor, even though a parent or other adult acts as custodian. Once the minor reaches the age of majority (18 in most states), the funds belong to him/her. There are no tax penalties for withdrawals for any purpose—before or after the age of majority. However, custodians are subject to legal restrictions on the use of the funds. And financial institutions may impose penalties for early withdrawals from CDs or fees in other situations.
A mutual-fund distribution allocated to gains realized on the sale of fund portfolio assets. You report the distribution as long-term capital gain even if you held the fund shares short term.