Custodial accounts offer a low-cost way to buy shares for your children or grandchildren. Getty Images By Kimberly Lankford, Contributing Editor August 14, 2012 I opened passbook savings accounts for my grandchildren at my bank last year. Not only do the accounts pay essentially no interest, but the bank recently started deducting service fees. In lieu of making a “gift” of fees to the bank, I’d like to buy stock for my grandchildren. How do I go about it?SEE ALSO: Stocks Are an Investment in Your Child's Future Several brokerage firms offer custodial accounts with low minimums, no set-up or annual fees, and low or no commissions for buying and selling shares. For instance, TD Ameritrade has no fees or minimum investment and charges $9.99 for each online stock trade. Charles Schwab sets a minimum investment of $100 and charges $8.95 for online stock trades. Scottrade has a $500 minimum investment and charges $7 for online trades. Each brokerage also offers many exchange-traded funds and mutual funds that don’t charge commissions for buying and selling. ING Direct’s Sharebuilder program has no minimums and charges $4 per trade if you sign up for the monthly automatic investment plan, which can be a good option if you want to make regular investments every few months. And if you are still interested in savings accounts for the kids, ING Direct also offers its Kids Savings Account, which carries no minimum, charges no fees and is paying 0.8% interest. Advertisement To open custodial accounts for your grandchildren, you’ll need their Social Security numbers (each grandchild will need a separate account). Money you contribute to a custodial account is considered an irrevocable gift to the minor and can’t be taken back. You’ll need to appoint a custodian for each child’s account, who will manage the assets until the child reaches the age of majority (age 18 or 21 in most states) and takes control of the money. The custodian may be grandparents, the child’s parents or another person who will manage the assets in the best interests of the minor, says Dara Luber, senior manager of investment products and retirement for TD Ameritrade. Even if the parents end up being the custodian, grandparents may still contribute money to the account. For more information about financial gifts for children (or grandchildren), see Tax-Smart Ways to Help Your Kids. Got a question? Ask Kim at firstname.lastname@example.org.