Custodial Roth IRA for Kids: Step-by-Step Setup Guide (2026)

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A 12-year-old who earns $3,000 a year babysitting can put it into a Roth IRA. If that account holds an S&P 500 index fund and her parents add $200/month until she turns 18, she's accumulated $30,000 of contributions. She doesn't touch it. She doesn't add another dollar. At age 65, that account holds roughly $3.4 million, tax-free, ready to spend in retirement.

That's the math. The hard part isn't the contributions or the strategy. The hard part is two things almost no parent gets right: documenting the income properly, and actually clicking the button that invests the cash. Skip either and the whole plan falls apart.

Key takeaways

• A child needs documented earned income (a W-2 job or properly invoiced self-employment) — gifts, allowance, and chores don't count.
• Contributions are capped at the child's earned income OR $7,000 (2026 limit), whichever is lower. The money can come from the parent.
• The single biggest mistake: depositing money into the Roth and forgetting to buy the index fund — the cash sits there earning ~0%.
• S&P 500 index funds have different tickers per broker. FXAIX at Fidelity, SWPPX at Schwab, VFIAX at Vanguard.
• At the age of majority (18 in most states, 21 in a few), the account legally becomes the child's — they can do whatever they want with it.

Who qualifies — and the one rule the IRS will audit

The Roth IRA is the most tax-efficient account you can give a child, but the IRS gates it behind one rule: the child must have earned income in the year of contribution. Earned income means W-2 wages or net self-employment income — not gifts, allowance, investment income, or "compensation" parents pay themselves.

What counts as earned income

• Any W-2 job — grocery store, lifeguard, ice cream shop, summer camp counselor
• Babysitting, lawn mowing, tutoring — paid by people outside the family, with records
• Working in the family business — but only if it's a real, age-appropriate job with documented pay at a market rate
• Acting, modeling, child performer income — W-2 from a casting agency
• Online income — YouTube revenue, Etsy sales, Twitch streaming (with self-employment records)

What does NOT count

• Allowance for chores around the house
• Gifts, including birthday money and cash from grandparents
• Investment income, dividends, interest
• "Pretend" employment without real work, real records, and market-rate pay

The IRS occasionally audits custodial Roth IRAs where the contribution amount looks suspicious vs. the child's age. Keep a simple log: who paid the kid, what they did, how many hours, the date. A one-page spreadsheet is enough. Don't reconstruct it later — do it as you go.

Documentation that holds up

For a child babysitting in the neighborhood, the bare minimum is: a written log of dates, hours, and amounts; receipts or signed notes from the families they sit for; ideally a small business bank account where deposits land. If the child earns over $400 in self-employment income, they technically have to file Schedule SE — but you can use a simple cash-receipts log to back it up.

Why a Roth (not a Traditional) makes sense for a kid

The Traditional IRA gives you a deduction today, taxes you at withdrawal. The Roth IRA does the opposite: you pay tax now, but every dollar of growth — and every dollar of withdrawal in retirement — is tax-free.

For a child, this is the no-brainer choice. Their tax bracket is 0% (the standard deduction is $14,600 in 2024; most kids' incomes fall below it). They don't need the deduction. What they get instead is 50+ years of compounding inside a tax-free wrapper — the single most powerful instrument the U.S. tax code offers.

Bonus: Roth contributions (not earnings) can be withdrawn at any time, at any age, for any reason, with no tax and no penalty. If your kid needs $5,000 for college textbooks at 19, the contributions are available. The earnings stay locked until 59½ — but the contributions are theirs to use as an emergency cushion.

The compounding math: what $50/month turns into

This is the part that should make every parent put down their phone. These figures assume the historical 10% average annual return of the S&P 500 with monthly contributions, compounded for 50 years (from age 15 to 65).

Stop and look at the $50 row. $30,000 of contributions becomes $793,000. The rest is just time and compounding. A 15-year-old has 50 years. A 35-year-old has 30 years. That 20-year head start more than triples the final number for the same monthly amount.

The "stop at 18" scenario

You don't have to keep contributing forever. A common path: contribute heavily during the working teen years (ages 13–18), then let the child take over later. If a parent contributes $200/month from age 13 to 18 ($14,400 total) and the child never adds another dollar, the S&P 500 average return at 10%/year still grows that to roughly $1.6 million by age 65. That's the magic of the early years.

Step-by-step: opening the custodial Roth IRA

Step 1 — Confirm the child has earned income this year

Before you do anything else, verify the kid has a paper trail for at least the amount you plan to contribute. No income = no Roth contribution allowed.

Step 2 — Pick a broker that offers custodial Roth IRAs with $0 account fees

The major brokers that do this well are Fidelity, Charles Schwab, and Vanguard. All three: no account minimum, no annual fee, full custodial Roth IRA support.

• Fidelity — by far the easiest UX. The app is best-in-class. Roth IRA for Kids is their dedicated product name. Recommended for most parents.
• Charles Schwab — slightly clunkier signup but excellent service. Apply via Schwab's affiliate program on CJ.
• Vanguard — the original index-fund company. Best if you're a Vanguard household already.

Avoid: Robinhood (no custodial accounts as of 2026), most fintech apps, and anyone charging an annual fee.

Step 3 — Open the account online (~15 minutes)

The parent (or guardian) is the custodian. The child is the beneficiary. You'll need:

• Your driver's license + SSN
• The child's Social Security number
• The child's birthdate
• A bank account to fund the contribution

The form will ask you to declare the child's earned income for the year. Be honest — this is what justifies the contribution amount.

Step 4 — Transfer money in

Connect your checking account, then make a one-time transfer or set up monthly auto-deposits. Money lands in the account as cash — usually within 1–3 business days.

Step 5 — ★ Click the button that actually buys the S&P 500 fund

This is the step that 30% of parents miss, costing them years of growth. Cash sitting in a Roth IRA is not invested. It earns the broker's money-market rate (a few percent at most) — not 10%. You have to place a buy order.

In your account, navigate to Trade → Mutual Funds (or ETFs). Search for the ticker matching your broker (see table below). Enter the dollar amount. Click Buy. Confirm. Now the money is in the index fund and the clock starts.

Step 6 — Set up auto-invest so this can't happen again

Every major broker lets you schedule recurring purchases of the same fund. Set it up once: "Buy $200 of FXAIX on the 1st of every month." Now even future contributions get invested automatically — no missed clicks.

Pick the right S&P 500 fund for your broker

S&P 500 index funds at different brokers track the exact same 500 stocks, but they each sell their own house-brand version. Pick the one that's commission-free and has the lowest expense ratio at your broker.

The winner for a child's Roth IRA is FXAIX at Fidelity. Lowest expense ratio (0.015%), no minimum, fractional-dollar purchases (so you can buy $50 worth, not just whole shares), and Fidelity's UX is the easiest for first-time investors to navigate without making mistakes.

Should you diversify with multiple funds?

For a child's Roth, no — at least not for the first 10 years. The S&P 500 already gives exposure to 500 of the largest U.S. companies across every sector. The added complexity of a "three-fund portfolio" (U.S. total, international, bonds) doesn't move the needle in a long-time-horizon Roth and adds clicks where you might forget. Keep it brutally simple. The "forget to invest" risk is real; the "didn't add international exposure" risk is not.

The "buy and forget" trap — the biggest failure mode

The single most common Roth IRA mistake at every brokerage is depositing money and never placing a buy order. The money sits in cash, earning the broker's overnight rate. Over five years, an uninvested $10,000 in cash vs. the same $10,000 in the S&P 500 is the difference between roughly $10,500 and roughly $16,000 — a $5,500 mistake on a five-year window. Over 50 years, the gap is catastrophic.

Three rules that prevent this:

1. Every deposit must be followed by a buy order. The transfer is not the investment.
2. Set up auto-invest immediately so future contributions never sit in cash.
3. Log into the account once a quarter and confirm the holdings tab shows the fund — not cash. Takes 30 seconds.

Tax filing — what you need to do (and what you don't)

If the child's total income is below the standard deduction (~$14,600 for 2024), they probably don't have to file a federal return at all. But they should keep their W-2 or self-employment records for at least three years in case the IRS questions the Roth contribution.

Self-employment income over $400 triggers self-employment tax — file Schedule SE. The Roth contribution doesn't appear on the parent's return; it goes on the child's (if they file one). The broker will mail a Form 5498 each January showing the contribution.

The Kiddie Tax does not apply to Roth IRA contributions — it only kicks in on unearned investment income above ~$2,600 (2024 threshold). Inside the Roth, growth is shielded entirely.

Risks you should weigh honestly

1. IRS audit risk if the income isn't documented

This is the #1 risk. If you contribute $5,000 to a 12-year-old's Roth and can't produce paperwork showing the child earned $5,000, the contribution is invalid and the IRS can impose a 6% excise tax per year until the excess is removed. Solution: keep contemporaneous records.

2. The account becomes the child's at the age of majority

In most states the child gains legal control at 18. In a few — Alabama, Mississippi, Nebraska — it's 19 or 21. They can withdraw contributions tax-free, blow it on a car, or keep compounding. You can talk about it, but legally you can't override their choice. This is the biggest non-tax risk. Build the conversation in over years.

3. Investment risk

The S&P 500 historically averages 10% annually but in any single year can drop 30–50%. 2008 was -37%. 2022 was -18%. These don't matter over a 50-year horizon, but they will feel terrible when they happen and the child sees the balance. Pre-frame this: "Down years are when the long-term wealth gets built. Cheap shares."

4. Concentration risk

The S&P 500 is U.S. large-cap stocks only. If U.S. equity markets underperform global markets for a multi-decade stretch (as happened in the 2000s), the account will lag a diversified portfolio. Acceptable trade-off for the simplicity, but worth knowing.

5. FAFSA impact (limited but exists)

Roth IRA assets owned by the student do not count as student assets on the FAFSA. Distributions taken during the FAFSA reporting years do count as student income, which can dramatically reduce financial aid. Plan to leave the account untouched during college years (the kid has plenty of other tax-free funding options).

6. Future law changes

Roth IRA rules have been remarkably stable since 1997, but Congress could in theory change them. Don't bet everything on Roth-specific rules being identical 50 years from now. (This applies to any retirement account, not just Roths.)

When the account legally becomes the child's

The transition happens automatically at the state's age of majority. The broker will send paperwork, the custodian's name comes off, and the child is the sole legal account holder.

The best preparation isn't paperwork — it's conversation. Starting at 14 or 15, show the child the account, show them the balance, show them the chart. By the time they're 18, the account isn't a windfall — it's a familiar long-term commitment they've watched grow. Most kids who've seen the compounding chart aren't tempted to drain it. The ones who've never been told about it sometimes are.

Related reading

• 529 vs Roth IRA: Which Is Better for College Savings? — A 529 grows tax-free for college and gives many states a deduction on the way in. A Roth IRA grows tax-free for anything and can p…
• Backdoor Roth IRA: The Legal Workaround for High Earners — Earn too much to contribute directly to a Roth IRA? The Backdoor Roth lets you put $7,000 a year into Roth anyway, legally, in fou…
• The 4% Rule Explained: How Much You Really Need to Retire — Multiply your portfolio by 4% and you have a number most retirees can spend each year for 30 years without running out. That singl…

FAQ

Can I open a Roth IRA for a baby?

Only if the baby has documented earned income. For most newborns this is impossible. The exception is child models or performers with W-2s from a casting agency — but the IRS pays close attention to these accounts.

What's the contribution limit in 2026?

$7,000 (the Roth IRA limit for those under 50), but capped at the child's actual earned income. So a kid who earned $3,000 can contribute up to $3,000, not $7,000. The money doesn't have to come from the child — parents can gift it as long as the kid earned at least that much.

Can my child use the money for college?

Contributions can be withdrawn at any time, tax- and penalty-free. Earnings withdrawn before 59½ are subject to tax and a 10% penalty, but the 10% penalty is waived for qualified higher-education expenses. Generally a Roth IRA is a worse college savings vehicle than a 529 plan, but using contributions for college is fine.

Can my child use the money for a first home?

Yes. Up to $10,000 of earnings can be withdrawn tax- and penalty-free for a first-home purchase, in addition to all contributions. This is one of the most underused Roth IRA features.

Do I have to file a tax return for my kid to contribute?

Usually no. If the kid's total income is below the standard deduction and they only have W-2 income, no return is needed. Self-employment income over $400 triggers Schedule SE filing. Either way, keep the W-2 or income log for three years.

What if my kid stops working?

Existing contributions stay put and continue growing. They just can't add new money for years where they had no earned income. The account itself doesn't expire or close.

What happens if I contribute too much?

The excess gets hit with a 6% excise tax per year until it's removed. Solution: withdraw the excess (and any earnings on it) before October 15 of the year following the contribution. Brokers have a one-click "return of excess" form.

Can grandparents contribute too?

Yes — any adult can fund the account, as long as the total stays under the child's earned income for the year and under the $7,000 annual limit. Birthday and holiday gifts deposited as Roth contributions are one of the best gifts a grandparent can give.

What if my kid wants to switch from the S&P 500 fund later?

That's their choice once they reach the age of majority. While you're custodian, you make the call. Most financial advisors recommend keeping equity exposure (90%+ stocks) until at least age 50 in a Roth this young. There's no rush to add bonds.

Is there a Roth IRA for a self-employed kid (Schedule C income)?

Yes, exactly the same account. The only difference is the income proof — keep a one-page log of clients, dates, and amounts. The IRS doesn't require formal invoices for under $400, but anything over should have a paper trail.

The bottom line

A custodial Roth IRA is the most powerful single financial move you can make for a working child. The two failure modes are documentation and the unclicked Buy button. Get those right and the math takes care of itself.

Pick Fidelity. Open the account online. Fund it. Buy FXAIX. Set up auto-invest. Walk away. Check in once a quarter to confirm the cash isn't sitting uninvested. Talk to the kid about it as they grow up. That's the whole playbook.