Suppose your teenage child lines up an after-school job and is raking in the money. Your progeny might have an eye on the latest X-Box or iPhone, but there are plenty of other ways to spend that hard-earned cash.

Crazy as it might sound, you could encourage your child to deposit some of the funds in a Roth IRA.

Why would a high school student contribute to a Roth? This is a good time to teach your child about the benefits of tax-advantaged accounts. If your 17-year-old puts away $5,500 each year (the current maximum) and receives a hypothetical 7% annual return, the stash will grow to a staggering $2,235,909 by the time he or she is ready to retire at age 67!

What's more, future distributions from a Roth may be 100% tax-free. Although you generally have to wait until age 59½ to qualify for this treatment, earlier distributions may be wholly or partially tax-free under certain circumstances.

Finally, if you want to take some, or all, of the sting out of the situation, you can give your teenager a cash gift for up to the amount of the Roth contribution. This is perfectly legal as long as the child has earnings from a job. Plus, there's no gift tax liability because the maximum IRA contribution is less than the $14,000 a year you can give without tax liability. Everybody wins.