Best investment accounts for kids, ranked by what the kid keeps at 18

Search "best investment accounts for kids" and 5 of the top 10 results come from the companies that sell the accounts (we checked on Oct 16, 2026). Fair enough, it's their search. But none of them runs the same dollar through every account and shows you what comes out the other end.

So we did. $150 a month, from the day the kid is born to the day he turns 18, at 7%. Then we let each account do its thing: taxes, fees, the aid form, the age he gets the keys.

The spread is the 529's own range: $64,608 spent on school, $57,522 cashed out at a 12% rate. Everything else on this list lands between those 2 numbers or off the chart entirely.

Which account keeps the most at 18?

Depends on 1 thing: does the money end up paying for school. Read the 2 middle columns separately. They are 2 different races.

The fine print, once, so we don't have to repeat it 9 times: 7% is our modeling assumption, not a promise. The S&P 500 averaged about 10.0% a year from 1928 through 2025 with dividends, before fees and inflation (Damodaran, NYU Stern). Blah blah, past performance. Same assumption on every page, which is the whole point. It makes the accounts comparable.

1. Is a 529 the best investment account for a child?

For money that ends up paying for school, yes. A qualified withdrawal pays $0 of federal tax, so the 529 keeps the full $64,608.

It also behaves on the aid form. A parent-owned 529 adds at most 5.64% of its value to the Student Aid Index, so $10,000 in it costs at most $564 of aid.

The catch is fees, and they are bigger than they look. On $150 a month, the average advisor-sold plan (0.79%) ends $3,167 behind the average direct-sold plan (0.30%). Most states let you buy another state's plan, unless your own state's deduction is worth more: $1,620 over 18 years at a 5% state rate, in our run.

And if the kid skips college? Cashed out at a 22% bracket it nets $54,301. The break-even is about 48% of the money reaching school.

Best state 529 plan: is the deduction worth it · Does a 529 affect financial aid? · Why 529 plans are a bad idea, the 2 cases that hold up

2. Is a Trump Account better than a 529?

For college, no, by $1,686. For anything else, it beats the 529 by $1,829, and the free $1,000 is the whole reason.

The structure is the weird part. A Trump Account stops taking parent money on Jan 1 of the year the kid turns 18, because from then on it is an ordinary traditional IRA. So it gets 210 deposits to the 529's 216, and lands at $63,695 before tax.

The 6 deposits it never takes are $900 that stays in your pocket. Count that, and the 2 accounts finish $13 apart.

For college the 529 nets all $64,608 and the Trump Account $62,922 at a 12% rate, even with the $1,000 folded in. Not for college, the Trump Account nets $59,351 against the 529's $57,522. The $1,000 pilot deposit is for kids born 2025 through 2028.

Trump Account vs 529: we ran both for a 2026 baby · Trump Account calculator

3. What is the best custodial brokerage account for a child?

A UTMA is the account that wins when the money never goes to school: $60,867 at 18 either way. It can hold anything, from an index fund to the title to a rental house.

The kiddie tax everybody warns about? On our model it comes to $0. The biggest dividend year is $685, under the $1,350 line, at the 1.06% yield a plain S&P 500 fund pays.

What it does cost: $3,741 of capital gains tax when it's cashed out at 18, and a much bigger bite on the aid form, because the kid owns it and student assets count at 20%. Over 4 years of FAFSAs that gap reached $21,323 for a family assessed at the top rate.

The real catch is not a tax. It's the handover age: $40,703 of growth between 18 and 25 that the state, not you, decides who controls.

Which broker to hold it at is a fee question, and the fee spread is the subject of its own guide.

We ran $150 a month for 18 years through 5 custodial accounts' posted fees. Fidelity, Schwab, Vanguard and E*TRADE all finished within $1,142 of each other, and $866 of that was Vanguard's $25 account fee, which e-delivery waives. The index funds' expense ratios accounted for $276.

The fund barely matters. A flat $12 a month costs $5,168.

Best custodial brokerage account, ranked by 18-year cost · UTMA vs 529 after tax and aid · UGMA vs UTMA

4. Should I just invest for my kid in my own brokerage account?

It's the boring option, and it lands closer than you'd think: $59,290 at 18, taxed at a 15% capital gains rate. That is $5,318 behind a 529 spent on school and $1,768 ahead of a 529 cashed out unused at 12%.

It has no contribution cap, no list of approved expenses and no handover date. The kid never finds out it exists unless you tell him. On the FAFSA it counts like a 529, at up to 5.64%.

The math says it wins whenever less than about 48% of the money is going to reach school at a 22% bracket. For a 12% family whose gains are taxed at 0%, that line moves to about 97%.

The taxable brokerage case, with the break-even

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5. Is a Coverdell ESA better than a 529?

Cheaper, and smaller. Put $2,000 a year for 18 years into a Coverdell holding a 0.03% index fund and it ends $2,036 ahead of the average direct-sold 529 age-based portfolio at 0.30%. Against a 0.11% 529, the lead shrinks to $611.

Then the door closes. $2,000 a year is the Coverdell's legal cap.

A 529 at $250 a month just keeps going, and ends $32,724 ahead. Add the income limits on who can contribute, the no-contributions-after-18 rule and the empty-it-by-30 rule, and the Coverdell is a niche account. The niche is real: some K-12 costs it covers that a 529 does not.

Coverdell ESA vs 529 in 2026

6. Are I bonds a good investment for kids?

I bonds are the only account on this list that cannot lose a dollar of face value. That's the pitch, and it's a real one.

Bonds issued through Oct 31, 2026 pay 4.26%: a 0.90% fixed rate locked for 30 years, plus an inflation piece that resets every 6 months. A kid holds them in a minor linked account inside a parent's TreasuryDirect login, up to $10,000 a year per Social Security number.

The cost of the safety: $1,000 a year for 18 years at 4.26% held flat lands at about $27,512. At 7% in an index fund it's $37,269.

And the trap every "I bonds make a great gift" post skips: a bond in the kid's name can never use the education tax break.

The exclusion only applies when the bond's owner was 24 or older when it was issued. Dad's name, yes. Kid's name, never.

I bonds for kids: how to buy them, and the tax break a kid's name kills

7. What is the best high-yield savings account for a kid?

The highest uncapped rate we found for a kid's savings on Oct 16, 2026 was 3.10% APY, at Ally as a custodial account. $50 a month for 18 years at that rate ends at $14,376.

The same $50 in an index fund at 7% ends at $21,536. That's $7,160 the savings account gives up.

So it loses over 18 years. It wins over 5.

Over rolling 5-year windows, the index trailed 3.10% cash in 19 of 94. Money the kid needs inside about 5 years (a car at 16, a first semester) is where the savings account earns its spot. Rates reset whenever the bank wants, so every number here carries its date.

Best HYSA for kids, rates dated and the 18-year comparison

8. Can I open a Roth IRA for my baby?

You can open it. You can't put anything in it. A custodial Roth IRA takes the smaller of $7,500 (2026) or the kid's taxable compensation, and a baby's compensation is $0.

Interest and dividends don't count. A W-2 or documented self-employment does. So the Roth ranks dead last for a newborn and near the top for a 16-year-old with a summer job.

The 2 aren't rivals, either. A 529 open 15 years can move up to $35,000 into the kid's Roth over his lifetime. The 529 is the account that can start at birth. The Roth is where some of it can land later.

Custodial Roth IRA vs 529: which one first

9. Should I save for retirement or my kid's college first?

The best account for your kid might not be his. With a 50% employer match, $150 a month for 18 years builds $96,912 in a 401(k) by his 18th birthday. The 529 holds $64,608.

We stress-tested it the mean way. Say the 401(k) dad pays for college with a Parent PLUS loan, $857 a month with the fee, and the 529 dad invests that same $857. The matched side is still about $75,643 ahead at 65, before taxes on either side.

Take the match away and the 2 accounts grow to the same $64,608. The whole answer hangs on 1 variable: are the dollars under the match cap or not.

Retirement or your kid's college first

What are the alternatives to a 529 plan?

Everything from item 2 to item 8. On this model, 3 of them finish within $5,318 of the 529 for college: the Trump Account ($62,922), the UTMA ($60,867) and your own brokerage account ($59,290).

And 3 of them beat the 529 when the money never reaches school: the UTMA ($60,867), the Trump Account ($59,351) and your own account ($59,290), against the 529's $57,522.

The Coverdell, I bonds and a savings account each solve a narrower problem. The custodial Roth isn't an alternative for a baby at all. The honest summary from the 529 critics' case: the 529 wins when most of the money reaches school, and loses when it doesn't.

Frequently asked questions

What is the best investment account for a child?

For money spent on school, a 529: it keeps all $64,608 of a $150 a month, 18-year account at 7%, and counts at most 5.64% on the FAFSA. For money that may not reach school, a UTMA ($60,867 after capital gains tax) or a Trump Account ($59,351 after a 12% tax) keeps more.

Can I open an investment account for my child?

Yes. A 529, a Trump Account, a UTMA custodial brokerage account, a Coverdell ESA and a custodial savings account can all be opened for a newborn with a Social Security number. A custodial Roth IRA can be opened but not funded until the kid has earned income.

Should I open a 529 or a brokerage account for my child?

The break-even is about 48% of the money reaching school at a 22% bracket. Above that, the 529 wins by up to $5,318 on our model. Below it, a taxable account in the parent's name wins by up to $4,989 at a 22% rate.

What is the best custodial account for a child?

On after-tax dollars at 18, a UTMA brokerage account: $64,608 before tax on $150 a month at 7%, $0 of kiddie tax at a 1.06% dividend yield, and $3,741 of capital gains tax if it's cashed at 18. It counts at 20% on the FAFSA, and the broker ranking by 18-year fees is in the custodial brokerage guide.

Is a Trump Account better than a 529 for a baby?

For college, the 529 nets $64,608 and the Trump Account $62,922 at a 12% rate. For anything else at 18, the Trump Account nets $59,351 against the 529's $57,522. The free $1,000 pilot deposit is for kids born 2025 through 2028.

Can I open a Roth IRA for my baby?

The account can be opened, but the 2026 cap is the smaller of $7,500 or the kid's taxable compensation, which for a baby is $0. A 529 open 15 years can later move up to $35,000 into the kid's Roth.

How much will $150 a month be worth in 18 years?

$64,608 at 7% compounded monthly, on $32,400 put in. The account it sits in decides how much of that survives tax and fees, from all of it in a 529 spent on school to $57,522 in a 529 cashed out at a 12% rate.

Rules current as of Oct 2026: 2026 IRA limit $7,500, 529 to Roth lifetime cap $35,000 after 15 years, kiddie tax threshold $1,350, parent assets assessed at up to 5.64% and student assets at 20% on the 2027-28 FAFSA, Trump Account rules per 26 U.S.C. 530A with the $1,000 pilot deposit for 2025 to 2028 births, Morningstar 2026 average 529 fees 0.30% direct-sold and 0.79% advisor-sold. Each linked article carries its own dated check line. Rates and limits move, so check the date on this line before you lean on it.