Best HYSA for kids: why 3.10% beats the 7% accounts

The best HYSA for kids we found with no balance cap pays 3.10% APY on Oct 16, 2026, and $50 a month at that rate grows to $14,376 by age 18, which is $7,160 less than the same $50 in a 7% index fund. The savings account's case is money needed inside about 5 years. The 7.00% and 7.17% kids accounts pay those rates on the first $1,000 only.

Key takeaways

3.10% APY at Ally Bank, held as a custodial account, was the highest uncapped kid-eligible rate we found on Oct 16, 2026. Alliant Kids Savings paid 3.01% (Oct 8, 2026) and Capital One Kids Savings 2.50% (Oct 16, 2026).
The 7.00% (Chevron Federal Credit Union) and 7.17% (7 17 Credit Union) youth accounts pay that rate on the first $1,000 only. On $50 a month they finish 18 years at $12,661 and $12,063, below Capital One's 2.50%.
The FDIC national average savings rate, 0.37% (Sep 21, 2026), earns $365 on $10,800 over 18 years. 3.10% ends $3,211 higher.
At 3.7% inflation (BLS, 12 months ending Sep 2026) held 18 years, the 3.10% account ends at $7,475 in today's dollars, below the $7,915 the deposits are worth. At the 2.43% CPI-U average from Sep 2008 to Sep 2026, it ends $573 ahead.
Since 1928 the S&P 500 ended below 3.10% cash in 19 of 94 rolling 5-year stretches and 2 of 81 rolling 18-year stretches (Damodaran, NYU Stern).
A custodial (UTMA) account belongs to the kid and is handed over at an age the state sets. A joint account is co-owned, and Capital One's stays shared past 18. Each sits in a different $250,000 FDIC category.
Interest on $50 a month at 3.10% peaks at $422 a year, under the $1,350 filing line for a dependent in 2026. Selling a 7% index fund at 18 realizes about $10,736 of gain, over the $2,700 kiddie tax line.

Start with the bad version of a kids savings account: $50 a month from birth to 18, in an account paying the FDIC national average of 0.37% (as of Sep 21, 2026).

216 deposits. $10,800 in. $365 of interest.

Read that again. Then hold it up against the 7% index fund from our guide to the best investment accounts for kids, because that is where this ends up.

So here are the posted kids rates we could find, read off each bank's own page on Oct 16, 2026, run out 18 years. Then the question a rate table can't answer: who owns the money at 18?

What is the best HYSA for kids right now?

The highest uncapped rate we found on Oct 16, 2026 is 3.10% APY, on Ally Bank's savings account titled as a custodial account for the kid. Alliant Kids Savings is 9 basis points behind at 3.01% (Oct 8, 2026), and Capital One Kids Savings pays 2.50% (Oct 16, 2026).

Every number below came off the institution's own disclosure. Read the caps column before the rate column.

Posted APYs from each institution's own page, read Oct 16, 2026, plus the FDIC national average. Rates are variable.
Account	APY	Date on the page	Caps and tiers	Who owns it
Ally Bank Savings Account, custodial	3.10%	Oct 16, 2026	Same rate on every balance tier, no cap	Custodial, UTMA or UGMA by the kid's state. Paid out to the former minor at the age state law sets
Alliant Credit Union Kids Savings	3.01%	Oct 8, 2026	$100 average daily balance to earn, no maximum. Kids 12 and younger	Joint, adult owner must be an Alliant member. UTMA custodial version at the same 3.01%
Capital One Kids Savings Account	2.50%	Oct 16, 2026	All balances, no minimum, no fees	Joint, 1 kid under 18 and 1 adult. Stays shared after 18
Chevron Federal Credit Union MySavings Youth	7.00%	Oct 16, 2026	7.00% up to $1,000, then 0.75%. Members 21 and younger, membership eligibility rules apply, eStatements within 60 days or the rate drops	The kid is the primary member
7 17 Credit Union Youth Startup Savings	7.17%	Jul 15, 2024 on the rate page, Aug 1, 2024 on the product page	7.17% on the first $1,000, then 0.08%. Branch opening only, northeast Ohio	Kid is primary owner, parents may be joint. Moves to the kid's own membership savings at 18
FDIC national average, savings	0.37%	Sep 21, 2026	Deposit-weighted average of insured banks and credit unions	n/a

Is 3.10% a high yield savings account for kids, or a plain savings account with a kid's name on it? Both. Ally's standard savings account can be titled custodial, so the kid's money earns the adult rate.

The kid-branded accounts at Capital One and Alliant pay a bit less and come with the allowance tools. Across those 3, the kids savings account interest rate spread is 60 basis points.

We did not find a higher kid-eligible rate without a balance cap. We will restate the date every time we say the number, because it will not hold.

Why do 7% kids savings accounts lose to 2.50%?

Because they pay 7% on the first $1,000 and a base rate on every dollar after it.

7% on $1,000 is $70 a year. That is the whole headline.

That is Chevron's 7.00%. 7 17's 7.17% is $72 a year. Past $1,000 they drop to 0.75% and 0.08%.

At $50 a month the cap fills in month 19 at 7 17 and month 20 at Chevron. Every deposit after that earns the base rate, and at 7 17 the base rate is below the 0.37% national average.

Run out to 18, the 7.17% account ends at $12,063 and the 7.00% account at $12,661. Capital One's flat 2.50% ends at $13,585 and beats both. For money that keeps arriving every month, the uncapped rate wins.

Is a high yield savings account for kids worth it over 18 years?

Against the bad version, yes: 3.10% turns $50 a month into $14,376 at 18, $3,211 more than the 0.37% average. Against a 7% index fund, it gives up $7,160.

Same $50 in every row, deposited at the end of each month, 216 times. The only thing moving is the return.

Average savings, 0.37%

$11,165

Highest uncapped we found, 3.10%

$14,376

Index fund at 7%

$21,536

$50 a month, 216 end-of-month deposits, $10,800 in. Index at 7% nominal compounded monthly (7.23% a year effective). Today's dollars at 3.7% CPI-U (12 months ending Sep 2026). Dadvesting calculation, Oct 16, 2026.
Where the $50 goes	Rate	Balance at 18	Growth	In today's dollars
FDIC national average savings	0.37%	$11,165	$365	$5,806
7 17 Youth Startup, capped	7.17% to $1,000, then 0.08%	$12,063	$1,263	$6,273
Chevron MySavings Youth, capped	7.00% to $1,000, then 0.75%	$12,661	$1,861	$6,583
Capital One Kids Savings	2.50%	$13,585	$2,785	$7,064
Alliant Kids Savings	3.01%	$14,254	$3,454	$7,412
Ally Savings, custodial (highest uncapped we found)	3.10%	$14,376	$3,576	$7,475
Total-market index fund	7% nominal	$21,536	$10,736	$11,198

The $7,160 gap is 2 times what the savings account earned in interest over the whole 18 years.

Rate chasing inside the savings column moves less than it looks. Going from Capital One's 2.50% to 3.10% is worth $791 over 18 years. Going from 3.10% to the index fund is worth $7,160.

The vehicle matters more than the bank.

Does a kids savings account beat inflation?

At the last 12 months' 3.7% inflation, no. At the 2.43% average of the last 18 years, barely.

3.7% is the BLS CPI-U change for the 12 months ending Sep 2026. Held there for 18 years, the 3.10% account loses 0.58% a year in buying power, and its $14,376 buys what $7,475 buys today.

The deposits are spread over 18 years, so in today's dollars they are worth $7,915, not $10,800. The account ends $440 short of what went in.

The 0.37% average loses 3.21% a year, which is a savings account doing the opposite of saving.

But 3.7% is 1 year's reading. CPI-U averaged 2.43% a year from Sep 2008 to Sep 2026 (BLS). At that rate the 3.10% account gains 0.66% a year and ends at $9,335 in today's dollars, $573 above the $8,762 the deposits are worth.

Capital One's 2.50% about breaks even at 2.43%. The 7% index fund, compounded monthly, earns 7.23% a year, clears 3.7% inflation by 3.40% a year and ends at $11,198 in today's dollars, $3,283 above the deposits. At 2.43% it ends at $13,984.

Whether the savings account keeps its buying power depends on which inflation rate shows up. The index fund's lead does not.

When does a savings account beat the stock market for a kid?

When the money is needed inside about 5 years. Since 1928 the S&P 500 ended below 3.10% cash in 19 of 94 rolling 5-year stretches, about 1 time in 5.

Of course 7% a year is an average... blah blah. Except here the blah blah is the whole point, so we counted: Damodaran's S&P 500 returns with dividends, 1928 through 2025, a lump sum against 3.10% a year in cash.

S&P 500 including dividends vs cash at 3.10% a year, lump sum, rolling windows 1928 to 2025. Damodaran (NYU Stern, Jan 2026), Dadvesting calculation, Oct 16, 2026.
Holding period	Windows	Index ended below 3.10% cash	Share	Worst window, annualized
1 year	98	30	31%	-43.8% (1931)
3 years	96	18	19%	-27.3% (1930 to 1932)
5 years	94	19	20%	-12.7% (1928 to 1932)
10 years	89	9	10%	-1.7% (1929 to 1938)
15 years	84	3	4%	-0.2% (1929 to 1943)
18 years	81	2	2%	+2.0% (1929 to 1946)

Inside 1 year, the index lost to cash nearly 1 time in 3. Money for a stroller, a car seat, a daycare deposit or a move does not get 18 years to recover.

At 18 years the index trailed cash in 2 windows out of 81, both starting on the edge of the Great Depression.

Our generation remembers 2008, so we ran it as a stress test. The S&P 500 lost 36.55% that year with dividends, and in our 7% model that hit in the kid's senior year turns $21,536 into $13,665, below the savings account's $14,376.

In the model, no year inside 18 builds a lead big enough to take that hit and stay ahead.

The real 2008 went differently. $600 a year into the S&P 500 from 1991 through 2008, on Damodaran's actual returns, ended at about $15,500 against about $14,400 in 3.10% cash, because the 1990s had built a bigger lead than 7% a year would.

So the model is the worst case and the history is 1 real case. The gap between them is the risk the savings account does not carry.

Custodial savings account vs joint account: who owns the money at 18?

In a custodial account the kid owns the money and gets control at an age the state sets. In a joint account the kid and an adult co-own it, and nothing changes at 18.

A bank "kids savings account" is almost always 1 of these 2 legal things, and which one matters more than the 60 basis points between Capital One and Ally.

A custodial account is a UTMA (or in older accounts a UGMA). An adult runs it, the kid owns it, and deposits are gifts the adult cannot take back.

Ally's custodial savings is this kind. We walked through the handover ages state by state in UGMA vs UTMA.

A joint account is co-owned. Capital One's Kids Savings Account belongs to 1 kid under 18 and 1 adult, and its page says the account "will not change or close when your child turns 18." Alliant's Kids Savings works the same way.

The difference shows up here:

At 18, 21 or later. A custodial account ends. Ally closes it and moves the money to an account or a check in the former minor's name. A joint account does not end, and the adult stays an owner until somebody changes that.
On the tax return. Custodial interest is the kid's income, under the kid's Social Security number. The uniform act's drafters wrote that any income "is attributable to and reportable by the minor." A joint account has 2 owners, so the interest is not automatically the kid's.
On the FDIC chart. Coverage is $250,000 per depositor, per bank, per ownership category. A UTMA deposit is the kid's Single Account, apart from the parent's $250,000. A joint account is in the Joint Account category, where each co-owner's share is insured up to $250,000. Alliant, 7 17 and Chevron are credit unions, where the NCUA runs the same $250,000 line.

Neither is the right one. A custodial account locks the money to the kid on a date the state picked, and a joint account stays flexible and stays partly yours. The account the bank calls "kids savings" could be doing either job.

Do kids pay taxes on savings interest?

Not on a savings account this size. $50 a month at 3.10% earns $8 of interest in year 1 and $422 in year 18, under the $1,350 that makes a dependent kid file a 2026 return.

For 2026 a dependent's standard deduction is the greater of $1,350 or earned income plus $450 (Rev. Proc. 2025-32). It takes a $43,548 balance at 3.10% to earn $1,350 in a year.

The kiddie tax starts higher. Unearned income over $2,700 can be taxed at the parents' rate on Form 8615, and it takes an $87,097 balance at 3.10% to earn that much (IRS Topic 553).

That covers a kid under 18, plus an 18-year-old or a full-time student 19 to 23 whose earned income did not cover more than half of his support.

At $10 or more of interest in a year, the bank sends a Form 1099-INT, and all taxable interest gets reported whether or not the form shows up. On a custodial account that form carries the kid's Social Security number.

For a kid who would otherwise have to file, a parent can report the kid's interest and dividends on the parent's own return with Form 8814, in place of a return for the kid. That works when the kid's only income is interest and dividends and it totals less than $13,500.

Where tax bites is the index fund, at the sale. The kiddie tax applies to what an account realizes in a year, not to the pile, and on $50 a month the yearly dividends do not reach the line.

Selling the whole fund at 18 realizes about $10,736 of gain in 1 year, well over $2,700, and an 18-year-old dependent or a full-time student under 24 can still be under the kiddie tax rules. Inside a 529 the same growth is not taxed when it goes to qualified education costs.

We ran the tax year by year on a bigger deposit in UTMA vs 529.

Is a 529 better than a savings account for a baby?

For money with no job until 18, the math leans toward the index fund a 529 can hold: $7,160 ahead of 3.10% on $50 a month, and untaxed when it goes to qualified education costs. For money with a job inside about 5 years, the savings account's no-down-year record is the point.

That is the second-kid version of the question, the one we wish somebody had asked us the first time: not which bank, but what the money is for and when.

Scale the deposit and the gap scales with it. $150 a month at 7%, the number behind our start-age math, ends at $64,608.

A savings account for a baby is 1 of the accounts, not the account. The 529, the custodial brokerage account and the custodial Roth IRA each hold the index fund inside a different tax wrapper, and the wrapper is where the next $7,160 comes from.

What the math says

The highest uncapped kids savings rate we found on Oct 16, 2026 is 3.10%, and $50 a month at that rate is $14,376 at 18. The same $50 in a total-market index fund at 7% is $21,536, a $7,160 lead, and at 3.7% inflation the fund is the only option that ends with more buying power than went in. The variable that decides it is when the money is needed: since 1928 the S&P 500 ended below 3.10% cash in 1 of every 5 rolling 5-year stretches, and in 2 of 81 rolling 18-year stretches.

Every one of those numbers is true, and none of them is a suggestion.

How we ran the numbers

1 Python script, run Oct 16, 2026. Every figure on this page is what it printed.

$50 a month, deposited at the end of each month, 216 months (birth to 18), $10,800 contributed.
Bank and credit union APYs as posted on Oct 16, 2026, converted to the equivalent monthly rate, (1 + APY) to the 1/12th power minus 1, so the yearly result equals the posted APY. Rates held flat for 18 years, which they will not be.
Capped accounts: the youth APY on the first $1,000 of balance each month, the posted standard rate above $1,000 (0.75% at Chevron, 0.08% at 7 17). 7 17's rate page lists no separate rate above $1,000, so we used its Membership Savings rate of 0.08%, the rate on every standard savings account it lists. 7 17 credits dividends quarterly. Modeling it monthly moves the 18-year result by less than $10 either way.
Index fund: 7% nominal a year, compounded monthly (0.5833% a month), no fees, no taxes, the standard assumption across this site. Sensitivity: 5% ends at $17,460 and 9% at $26,818. The savings account loses to the fund at all 3 rates.
Today's dollars: ending balance divided by 1.037 to the 18th power, using the BLS CPI-U change of 3.7% for the 12 months ending Sep 2026, held flat. Deposits in today's dollars: each $50 divided by 1.037 to the power of its month over 12, summed, $7,915. Real annual rate is (1 + effective annual rate) divided by 1.037, minus 1, where the effective rate is the APY for the banks and 7.23% for 7% compounded monthly. Long-run case: CPI-U went from 218.783 in Sep 2008 to 336.940 in Sep 2026, 2.43% a year, which puts the deposits at $8,762 and the 3.10% account at $9,335 in today's dollars.
Rolling windows: Damodaran's annual S&P 500 total returns, 1928 to 2025, lump sum, each window compared with 3.10% compounded yearly. Monthly deposits and a total-market fund would give different counts. The 2008 figure is the same table's 2008 row, -36.55%. The 1991 to 2008 run puts $600 into each year at mid-year on the same table's returns, against $600 a year at 3.10%. Putting the $600 in at the start or end of each year instead gives $14,706 to $16,453 for the index and $14,176 to $14,616 for cash, so the index leads under every timing.
Tax lines: 2026 figures from Rev. Proc. 2025-32 and IRS Topic 553. The dependent filing rule (unearned income over the $1,350 amount) is from IRS Publication 501, applied with the 2026 amount. Yearly interest is the balance change minus that year's $600 of deposits. No state tax.
$5,000 lump sum (FAQ): $5,000 times 1.031 for 1 year and 1.031 to the 18th power for 18 years, 3.10% held flat.
Every figure rounded to the dollar. Every difference is 1 rounded figure minus another.

Frequently asked questions

Can a kid under 18 have a high yield savings account?

Yes, 2 ways. A kid-branded account like Capital One Kids Savings (2.50% on Oct 16, 2026) is co-owned by the kid and an adult. A standard account like Ally's savings (3.10% on Oct 16, 2026) can be held as a custodial UTMA account in the kid's name.

What is the kids savings account interest rate at Capital One?

2.50% APY on all balances, variable, effective Oct 16, 2026, with no fees and no minimum. Interest compounds and credits monthly.

Are 7% kids savings accounts real?

Yes, on $1,000. Chevron Federal Credit Union's 7.00% (Oct 16, 2026) and 7 17 Credit Union's 7.17% (Jul 15, 2024 on its rate page) pay that rate on the first $1,000, then 0.75% and 0.08%. On $50 a month for 18 years, both finish below a flat 2.50%.

How much will $5,000 grow in a high yield savings account for a kid?

At 3.10% APY, the highest uncapped kids rate we found on Oct 16, 2026, $5,000 earns $155 in year 1. Held flat for 18 years it grows to $8,662, and the rate will not stay flat.

Is a HYSA for kids FDIC insured?

Yes, up to $250,000 per depositor, per insured bank, per ownership category. A UTMA account counts as the kid's Single Account, separate from the parents' money. Credit unions carry the same $250,000 line through the NCUA.

What happens to a kids savings account when the kid turns 18?

It turns on the account type, not the age. A custodial account closes and the money moves to the former minor at the age the state's UTMA sets, 18 in some states, 21 in others and up to 25 in a few. Capital One's joint Kids Savings stays open and shared, and 7 17's youth account moves into the kid's own membership savings at 18.

Rules current as of Oct 2026: highest uncapped kid-eligible APY we found 3.10% (Ally, Oct 16, 2026), Alliant Kids Savings 3.01% (Oct 8, 2026), Capital One Kids Savings 2.50% (Oct 16, 2026), FDIC national average savings 0.37% (Sep 21, 2026), CPI-U 3.7% for the 12 months ending Sep 2026, 2026 dependent standard deduction floor $1,350, kiddie tax threshold $2,700, FDIC coverage $250,000 per depositor per bank per ownership category. Rates move, so check this date before you lean on it.

Sources

Capital One, "Kids Savings Account" (2.50% APY effective 10/16/2026, co-ownership and age 18 terms), checked Oct 16, 2026
Alliant Credit Union, "Kids Savings Account" (3.01% APY as of the 10/08/2026 dividend declaration date, $100 balance, joint ownership, UTMA custodial accounts), checked Oct 16, 2026
Ally Bank, "Ally Bank Savings Account" (3.10% APY as of 10/16/2026, same rate on all balance tiers), checked Oct 16, 2026
Ally Bank, "Custodial Account Application" (Savings Account offered as a custodial account, UTMA or UGMA title based on the minor's state of residence) and "Deposit Agreement and Disclosures" (effective Oct 10, 2026, custodial account opened under the minor's SSN, deposits an irrevocable gift to the minor), checked Oct 16, 2026
Ally Bank, "Termination of Custodianship", checked Oct 16, 2026
Chevron Federal Credit Union, "Checking & Savings Rates" (MySavings Youth 7.00% APY to $1,000, Primary Share Savings 0.75%, rate effective Oct 16, 2026) and "MySavings Youth Account" and "Membership Eligibility" (employment, association membership or residency), checked Oct 16, 2026
7 17 Credit Union, "Savings Account Rates" (Youth Startup Savings 7.17% APY, Membership Savings 0.08%, effective date July 15, 2024 as stated on the page) and "Youth Startup Savings" (7.17% APY on the first $1,000, "APY effective as of August 1, 2024", dividends paid quarterly), checked Oct 16, 2026
FDIC, "National Rates and Rate Caps, September 2026" (savings national deposit rate 0.37% as of September 21, 2026), checked Oct 16, 2026
FDIC, "Your Insured Deposits" (Single Accounts including Uniform Transfers to Minors Act accounts, Joint Accounts), checked Oct 16, 2026
FDIC, "Understanding Deposit Insurance" ($250,000 per depositor, per bank, per ownership category), checked Oct 16, 2026
U.S. Bureau of Labor Statistics, "Consumer Price Index, September 2026" (released Oct 14, 2026, all items up 3.7% over the last 12 months) and "CPI-U, all items, series CUUR0000SA0" (Sep 2008 218.783, Sep 2026 336.940), checked Oct 16, 2026
IRS, "Rev. Proc. 2025-32" (2026 kiddie tax amount $1,350, dependent standard deduction), checked Oct 16, 2026
IRS, "Topic no. 553, Tax on a child's investment and other unearned income (kiddie tax)" ($2,700, Form 8615, Form 8814 $13,500), checked Oct 16, 2026
IRS, "Topic no. 403, Interest received" (Form 1099-INT at $10 or more), checked Oct 16, 2026
IRS, "Publication 501 (2025), Dependents, Standard Deduction, and Filing Information" (a single dependent must file when unearned income is more than the $1,350 amount), checked Oct 16, 2026
NCUA, "Share Insurance Coverage" (up to $250,000 of federal share insurance, individual and joint accounts), checked Oct 16, 2026
Uniform Law Commission, "Uniform Transfers to Minors Act (1986)" (prefatory note: income "is attributable to and reportable by the minor"), checked Oct 16, 2026
Aswath Damodaran, NYU Stern, "Historical Returns on Stocks, Bonds and Bills" (S&P 500 including dividends, annual, data 1928 through 2025, updated Jan 5, 2026), checked Oct 16, 2026