Most parents want to set their kids up well. They buy the right foods, sign them up for activities, and save for college. But starting a child’s investment account early is one of the most impactful things a parent can do, and it often gets skipped simply because no one explained how it works.
This guide fixes that. It covers the core ideas behind investing: what it is, how it works, and why starting young may be one of the most lasting financial gifts a parent can give. No finance degree needed.
- Investing means putting money into an asset, like a stock or index fund, with the goal of growing it over time; starting early lets compound interest do most of the work.
- A $1,000 investment at age 15 could grow to roughly $46,900 by 65 at an 8% average annual return, about 4.6 times more than the same $1,000 invested starting at 35.
- Index funds are a low-cost way for young investors to spread risk across many companies at once, rather than betting on a single stock.
- Kids can start investing through custodial accounts (UGMA/UTMA), and teens with earned income may qualify for a custodial Roth IRA, both opened and managed by a parent.
- Time, not money, is the biggest advantage a young investor has. Even a small amount invested early has decades to compound.
What Is Investing?
Investing is putting money into an asset (something that has value and can increase in worth) with the goal of making it grow over time.
Think of it this way. If your child bought a small piece of a popular company for $50, and that company grew over the next ten years, that piece could be worth $100, $150, or more. No extra work required. The money works on their behalf.
Investing differs from saving. Saving keeps money safe and accessible. Investing takes on some short-term uncertainty in exchange for the possibility of much higher growth over the long run.
What Is Compound Interest, and Why Does It Matter?
Compound interest is why starting young changes everything about investing.
When money is invested and earns a return, those earnings start earning returns of their own. It keeps multiplying, automatically, for as long as the money stays invested.
Imagine two cousins, Jordan and Sam. Same family. Same $1,000. Very different outcomes.
- Jordan invests $1,000 at age 15 and never adds another dollar.
- Sam waits until age 35, invests the same $1,000, and also never adds more.
Assuming 8% average annual growth:
| Jordan | Sam | |
|---|---|---|
| Starting age | 15 | 35 |
| Amount invested | $1,000 | $1,000 |
| Value at age 65 | ~$46,900 | ~$10,060 |
Same amount. Same approach. Jordan may end up with roughly 4.6 times more simply because she started earlier. If she adds just $25 a month on top, that could grow to more than $175,000 by retirement.
Starting a child’s investment account is not just a money move. It is a head start on financial stability that most adults wish they had been given. Even a small amount invested today gives compound interest something to work with. Once it starts, it does not stop.
Every year of delay matters more than most people realize. Jordan’s 20-year head start turned $1,000 into $46,900 vs. Sam’s $10,060. Same investment, same growth rate, just a different start date. Compound interest rewards patience, but it has to start somewhere.
What Are Stocks?
A stock is a tiny piece of ownership in a company. Companies sell these pieces (called shares) to the public to raise money to grow. When someone buys a share, they become a partial owner.
Example: Maya is 13 and her parent helps her buy one share for $80. Three years later, the company has grown and that share is worth $120. Maya did nothing after buying it. The company’s growth did the work.
Some stocks also pay dividends (small cash payments to shareholders a few times per year), which is one more way an investment can earn without any action required.
What Are Index Funds?
Owning one company’s stock is risky. If that company has a bad year, the full value of that investment drops.
An index fund solves this by holding small pieces of many companies at once, spreading risk automatically across dozens, hundreds, or even thousands of companies.
Why index funds are a strong starting point for young investors:
- One company’s bad year does not sink the whole investment.
- They are low-cost because no professional is picking stocks; they simply follow a set list.
- Historically, they have outperformed most professionally managed funds over long periods. According to the SPIVA U.S. Year-End 2024 Scorecard, over 98% of large-cap active funds underperformed the S&P 500 over the 15-year period ending December 2024.
The most common index funds track the S&P 500 (the 500 largest publicly traded U.S. companies), which has historically averaged around 10% annual returns before inflation. According to Investopedia’s S&P 500 historical performance data, the average annualized return from 1928 through 2026 is approximately 10.09%. That is not guaranteed, as markets fluctuate year to year, but it is a useful long-term benchmark.
A few places to open a custodial account for a child (where index funds like these can be held) include UNest, FutureMoney, and Fidelity.
What Is Risk, and Why Should Kids Understand It?
Investing involves risk. The value of an investment can go down as well as up. But risk is not the same as danger.
Three things young investors need to understand about risk:
- Higher potential returns typically come with higher risk. A new startup’s stock could grow fast or go to zero. A government bond is safer but grows slowly.
- Time softens short-term risk. A 15-year-old whose investment drops 20% one year has 45 years for markets to recover. As Charles Schwab’s long-term investing research shows, staying invested through turbulent periods has historically been the strategy that wins over time.
- Diversification (spreading money across many investments) lowers risk, which is exactly what index funds do automatically.
Being young is one of the biggest advantages in investing. That time cushion disappears as people get older, and it cannot be bought back (a point worth emphasizing to your child).
How Can Kids Actually Start Investing?
Opening an investment account for a child does not require a large sum or financial expertise. It requires showing up early, because time is the one resource that cannot be added back later.
Kids under 18 cannot open their own brokerage account. Parents can open accounts on their behalf through two main options.
Custodial Accounts (UGMA/UTMA)
A UGMA or UTMA account is opened by a parent or guardian for a child. The adult manages the account until the child reaches the age of majority (typically 18 or 21, depending on the state), when ownership transfers to the child.
Key features:
- No annual contribution limits
- Funds can generally be used for any purpose once the child takes ownership
IMPORTANT: Investment earnings in a custodial UGMA or UTMA account may be subject to the “kiddie tax,” which can tax a portion of a child’s unearned investment income at the parent’s tax rate once it exceeds certain IRS thresholds. Review the full rules on the IRS Topic 553 page before opening an account.
Custodial Roth IRA (for children with earned income)
A Roth IRA is an Individual Retirement Account where contributions grow tax-free and withdrawals in retirement are tax-free. Any child with earned income (babysitting, lawn care, a part-time job) may qualify. A parent opens and manages it on their behalf.
- Contribution limit: the lesser of the child’s earned income or the annual IRA limit ($7,500 in 2026, per IRS guidance on IRA contribution limits)
- Decades of tax-free compounding ahead. This is one of the most powerful tools available to a teenager with any earned income, and most families overlook it entirely.
Two major brokerages that offer custodial Roth IRAs include Fidelity and Schwab.
529 Plan
A 529 plan is a tax-advantaged account built for education costs (college, trade school, and a capped amount of K–12 tuition). A parent opens it, stays in control, and names the child as the beneficiary. The money grows tax-free, and withdrawals are tax-free as long as they go toward qualified education expenses.
- Tax-free growth for school costs. Earnings are not taxed when used for qualified education expenses, and many states add a tax deduction or credit for what you contribute.
- High contribution limits. There is no annual contribution limit. In 2026, you can generally contribute up to $19,000 per beneficiary ($38,000 for married couples) without filing a federal gift tax return, though higher contributions are allowed.
- Leftover money has an exit. Under SECURE 2.0, up to $35,000 of unused 529 funds can be rolled into the child’s Roth IRA over their lifetime, if the account has been open at least 15 years and other rules are met.
A 529 plan is ideal for education savings but offers less flexibility than a custodial brokerage account, as non-qualified earnings withdrawals are generally subject to income tax and a 10% penalty.
What Misconceptions Should Families Clear Up First?
A few common misconceptions tend to get in the way before a child can engage with investing clearly.
Myth: You need a lot of money to start.
Reality: Many custodial accounts have no minimum balance. Some index funds accept $1. The amount matters far less than starting early.
Myth: Investing is like gambling.
Reality: Gambling is designed for most participants to lose. Broadly diversified funds held over long periods have historically produced positive returns the vast majority of the time. The mechanisms are completely different.
Myth: You have to watch the market every day.
Reality: Frequent checking tends to lead to worse decisions. Long-term investors who stay the course have typically outperformed those who react to short-term swings.
Myth: You have to pick the right stocks.
Reality: Most professional stock pickers underperform index funds over time. Buying a diversified fund and holding it is a strategy with strong historical support.
Bottom Line
Compound interest is the most important concept in this guide. Time turns small investments into significant sums. A $1,000 investment made at age 15 could grow to nearly $47,000 by retirement at an 8% average annual return. The same $1,000 invested at age 35 could grow to about $10,000. Same amount, very different outcome.
Kids can start through custodial accounts, while teens with earned income may qualify for a custodial Roth IRA. For most beginners, low-cost index funds are a simple way to start building long-term wealth.
Teaching a child about investing is important, but opening an account gives them the opportunity to put those lessons into practice and benefit from decades of compound growth. If you’re ready to open an account, UNest and FutureMoney are worth comparing.
Frequently Asked Questions
There is no exact right age. Many families find that 10 to 12 is when kids can start grasping basic concepts like ownership and growth. Custodial accounts make practical sense around 13 to 16. If a teenager has any earned income at all, that is a natural and powerful moment to open a custodial Roth IRA and make the concepts real.
The most common options are custodial brokerage accounts (UGMA/UTMA) and custodial Roth IRAs. A custodial Roth IRA is generally the stronger long-term choice for teens with earned income, because contributions grow and can be withdrawn in retirement completely tax-free. For kids without earned income, a UGMA or UTMA account is a flexible starting point.
Yes, through a custodial account. A parent or guardian opens and manages the account, but the investments inside are legally owned by the child. Once the child reaches adulthood (typically 18 or 21, depending on state law), the account transfers to them directly.
Compound interest is when money earns returns, and then those returns also start earning returns. It keeps building on itself the longer the money is left alone. If $100 is invested and it grows to $110, the full $110 is now earning returns, not just the original $100. Over decades, this effect can turn small amounts into significant sums.
Many custodial accounts at major brokerages have no minimum balance to open. Some index funds accept investments of $1. The amount matters far less than the timing. Time is the most valuable resource a young investor has, and it cannot be added back later.