UTMA vs 529: what each one nets after tax and aid

Run $150 a month through both accounts from birth to 18 at 7% and they both land at $64,608, because at the 1.06% dividend yield a plain S&P 500 index fund pays, the kiddie tax drag everybody warns about comes out at $0. The 529 still wins for college, by the $3,741 of capital gains tax the UTMA owes when it is cashed out at 18, and by a 4-year FAFSA gap of $21,323 that only costs real money if the family qualifies for need-based aid. If the kid never goes to college, the UTMA wins by $3,345.

Key takeaways

At $150 a month and a 1.06% dividend yield, the UTMA's lifetime kiddie tax bill is $0. The biggest single-year dividend is $685, under the $1,350 dependent standard deduction for 2026 (Rev. Proc. 2025-32). The yield has to reach 4.18% before the first dollar of tax lands.
The 2026 kiddie tax threshold is $2,700. It is 2 times the $1,350 in section 1(g)(4)(A)(ii)(I), and the IRS set that at $1,350 for both 2025 and 2026.
Selling the whole UTMA at 18 realizes $27,641 of gain and costs $3,741 at a 15% parent capital gain rate. The 529 spent on school costs $0.
Selling it does not get it out of the kid's name. The $60,867 of proceeds stay a custodial asset and add $30,433 to the Student Aid Index across 4 years, against $9,110 for the same money in a parent 529 at the top rate (2026-27 SAI guide). An SAI is a calculation that reduces assessed need, so it costs a family nothing unless they qualify for need-based aid.
That $30,433 lands within $1,775 of everything the account earned. Total earnings over 18 years are $32,208.
Flip the outcome and the UTMA wins. Cashed for something other than school, the 529 nets $57,522 at a 12% rate against the UTMA's $60,867, because 26 U.S.C. 529(c)(6) adds 10% on the earnings.
A UTMA cannot be rolled into a Roth IRA. IRS Publication 590-A allows only cash contributions and rollovers from eligible retirement plans, and a custodial account is not on that list.

Every page we read on the first screen of this search runs the same table. Control, taxes, financial aid, flexibility. 4 rows, 2 columns, no numbers.

Then they all land in the same place: use both. Which is a sentence dressed up as an answer.

So we priced it. Same money, same return, both accounts, every cost named in dollars. 1 of the 3 costs turned out to be a myth, and it is the one everybody leads with.

The money is $150 a month from birth, which is the baseline every projection on this site runs on. Why the start date matters more than the amount is a separate piece of math, and it is in start age beats amount.

What is the difference between a UTMA and a 529?

A 529 is an education account with a tax exemption attached. A UTMA is a plain taxable brokerage account with a legal wrapper that says the money already belongs to the kid.

That second part is the whole personality of the account. California Probate Code 3911(b) says a UTMA transfer "is irrevocable, and the custodial property is indefeasibly vested in the minor." Florida's statute uses the identical words.

You are the custodian, not the owner. There is no take-backs clause because the statute went out of its way to say so twice.

Rule by rule, UTMA against 529. Sources: California Probate Code 3911, 3920 and 3920.5, Florida Statutes 710.113 and 710.123, 26 U.S.C. 529, IRS Rev. Proc. 2025-32, Instructions for Form 8615, 2026-27 FSA Handbook and SAI guide. Checked Sep 18, 2026.
Rule	UTMA	529 plan
Who owns it	The kid, from the day of the transfer	The account owner, usually a parent
Can the money be taken back	No. Irrevocable and indefeasibly vested	Yes, at the cost of tax plus 10% on earnings
What it can be spent on	Anything for the kid's benefit, then anything at all once they take over	Qualified education, or pay the tax and the 10%
Tax while it grows	Dividends and realized gains are the kid's unearned income every year	Nothing
Tax on the way out	Capital gains on the gain, under the kiddie tax rules	$0 for school. Otherwise earnings taxed plus 10%
Federal yearly limit	None. The gift tax exclusion is the practical ceiling, $19,000 per donor in 2026	None. Same gift rule, with a 5-year averaging election
FAFSA treatment	Student asset, 20%	Parental investment, up to 5.64%
When the kid takes control	18 in California, 21 in Florida, 25 by election in some states	Never, unless the owner hands it over

That is the table everybody publishes. Here is what it costs.

What are the tax differences between a UTMA and a 529?

This is the part we expected to be the UTMA's biggest problem, and it is not.

A UTMA throws off dividends every year, and those are the kid's unearned income. The kiddie tax runs in 3 tiers for 2026.

The first $1,350 is covered by the dependent standard deduction, so it is untaxed.
The next $1,350 is taxed at the kid's own rate. For qualified dividends and long-term gains that rate is 0%, because the 2026 maximum zero rate amount for capital gains is $49,450 of taxable income for a single filer, and the kid is nowhere near it.
Everything above $2,700 is taxed at the parent's rate, and the Instructions for Form 8615 route qualified dividends and net capital gain through the Qualified Dividends and Capital Gain Tax Worksheet, so the parent's capital gain rate is what lands.

Now put a balance against it. At $150 a month and 7%, the account reaches $64,608 at 18. Its biggest dividend year, at the 1.06% trailing yield the iShares Core S&P 500 ETF was paying on Aug 31, 2026, is $685.

$685 is under $1,350. So the kid does not owe tax. The kid does not even have to file.

Kiddie tax over 18 years

Balance where the tax starts

$254,717

Monthly deposit to get there

$591

At a 1.06% yield the dividends only reach $2,700, where real tax starts, on a balance of $254,717. Getting there by 18 takes about $591 a month, every month, from birth.

The $1,350 line arrives earlier, at a balance of $127,358 or roughly $296 a month. That one triggers a filing requirement and $0 of tax, which is an annoying piece of paper and nothing else.

Here is the input the whole finding rests on, said out loud. The $0 is a function of how much unearned income the holding throws off, which for an index fund is almost entirely the dividend yield. At this balance the tax line breaks at a 4.18% dividend yield, or at 3.12% of the balance handed over as realized distributions each year, holding the other input where the base case puts it.

Real S&P 500 index funds pay somewhere near 1% to 1.3% and distribute near 0%, and the fund in our model pays 1.06%. So the finding carries roughly 4x of headroom on the 1 number that decides it. At a 5% yield the same account owes $113 over 18 years and ends at $64,493, which is where the $0 stops being true.

So the annual tax drag is real in exactly 1 situation: a fund that hands the kid realized capital gains. We ran that too. Add 5% of the balance in capital gain distributions every year and the 18-year tax bill is $408, and the account ends at $64,173 instead of $64,608. That is $435 gone, because the dollars that left could not compound.

$435 on $64,608. That is the whole drag, in the version built to make the drag look bad.

We set realized gains to 0 in the base case because that is what the fund's own record shows. The iShares Core S&P 500 ETF has made 1 capital gain distribution in its life: $0.069200 of short-term gain on the Dec 15, 2000 record date. Across all 108 quarterly records back to June 2000, long-term capital gains read $0.000000 in every row, and short-term has read $0.000000 in every row since.

Index funds mostly hold what they hold. Funds that trade hand the gains to whoever owns the shares, and here that is a kid.

The exit is where the UTMA pays. Sell the whole thing at 18 and the kid realizes $27,641 of gain, which is the $26,956 of unrealized gain plus that year's $685 dividend.

Subtract the $2,700 that is sheltered or taxed at 0%, and $24,941 lands at the parent's capital gain rate. At 15% that is $3,741.

The 529 spent on school pays nothing at all.

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Does a UTMA hurt financial aid more than a 529?

Yes, and this is the cost the charts understate, because they price it for 1 year on a round number.

Here is the version every other page prints. $10,000 in a kid's UTMA adds $2,000 to the Student Aid Index. The same $10,000 in a parent 529 adds $564. A $1,436 gap, and everybody moves on.

College is 4 years. The form gets filed 4 times. We ran it that way, on 1 scenario carried all the way through.

The scenario is the same one that produced the $3,741 exit tax above. The UTMA is sold in full at 18, the tax is paid, and $60,867 is what is left.

Here is the part most comparisons skip. Selling does not move the money out of the kid's name. The proceeds are still custodial property, so the FAFSA keeps assessing them at the student's 20% while they get spent. So the UTMA column below runs on $60,867 and the 529 column runs on its own untaxed $64,608.

The rates come from the 2026-27 Student Aid Index and Pell Grant Eligibility Guide. Student assets convert at 20% with no protection allowance. Parent assets convert at 12% and then run through a 22% to 47% table, so the ceiling is 5.64% and the floor for a family that reports assets is 2.64%. We walked that formula line by line in our 529 and FAFSA article.

Both accounts assessed 4 times, each drawn down by a quarter a year. The UTMA column starts at the post-tax $60,867, because the proceeds of the sale stay the kid's asset. The 529 column starts at its untaxed $64,608. Simplification: year 1 is assessed on the balance at 18, though the first FAFSA is filed before college starts. Rates from the 2026-27 SAI and Pell Grant Eligibility Guide. Our script, run Sep 18, 2026. Rounded to the dollar.
FAFSA	UTMA balance	UTMA at 20%	529 balance	529 at 5.64%	529 at 2.64%
Year 1	$60,867	$12,173	$64,608	$3,644	$1,706
Year 2	$45,650	$9,130	$48,456	$2,733	$1,279
Year 3	$30,434	$6,087	$32,304	$1,822	$853
Year 4	$15,217	$3,043	$16,152	$911	$426
4-year total	Not applicable	$30,433	Not applicable	$9,110	$4,264

$30,433 against $9,110 is a gap of $21,323. Against the 2.64% band it is $26,169, because a lower parent rate widens the gap.

Read the totals again. The UTMA's 4-year hit of $30,433 lands within $1,775 of everything the account earned in 18 years, which was $32,208.

Now the honest part, because a number that big deserves it. The SAI is not a bill. It reduces calculated need, and it only costs a family real money if 3 things are true: the family qualifies for need-based aid at all, the school has a cost of attendance high enough that need still exists, and the school meets that need. Plenty of families fail all 3, and for them the aid column is $0 in both accounts.

The 20% and 5.64% are published rates applied to a balance. What a specific school does with a specific SAI is a different question and a different office.

Is a UTMA or a 529 better for college?

On these numbers, the 529, and by more than the tax line alone suggests.

$150 a month from birth to 18 at 7% nominal, compounded monthly, both accounts. Tax at 15% parent capital gain rate for the UTMA, 12% plus the 10% additional tax for a non-qualified 529 exit. Note on the 12% row: a parent in the 12% ordinary bracket is very likely in the 0% long-term capital gain band, which would take the UTMA's exit tax to $0 and widen its win on that line. We hold 15% on every UTMA line anyway, so the UTMA is understated here, and no verdict on this page depends on it. Our script, run Sep 18, 2026. Rounded to the dollar.
At 18	UTMA	529
Balance before any exit tax	$64,608	$64,608
Tax paid along the way	$0	$0
Spent on school	$60,867	$64,608
Spent on anything else, 12% rate	$60,867	$57,522
Spent on anything else, 22% rate	$60,867	$54,301
Added to the SAI across 4 years	$30,433	$9,110

For college, the 529 clears the UTMA by $3,741 on tax. On the aid form, for a family that qualifies for need-based aid at the top assessment rate, it clears it by a further $21,323.

There is no combined figure on this page, because the 2 costs are different kinds of money. $3,741 is tax the kid pays. $21,323 is calculated need that disappears, and only for a family the formula reaches. Both are real and only 1 of them shows up on a 1099.

The return assumption moves the size of the gap while the winner stays put. At 5% both accounts reach $52,380, the UTMA nets $50,386 after its exit tax, and the 529's edge is $1,994. At 9% it is $80,453 against $74,441, an edge of $6,012.

None of that counts a state deduction, which only 1 of the 2 accounts can get and which we priced separately in best state 529 plan. It lands on the 529's side of this ledger.

What if the kid does not go to college?

Then the accounts trade places, and the UTMA's flexibility finally gets a price tag.

A 529 pulled out for something other than school owes income tax on the earnings plus a 10% additional tax, under 26 U.S.C. 529(c)(6), which borrows the penalty from 26 U.S.C. 530(d)(4). On $32,208 of earnings that is $57,522 left at a 12% rate and $54,301 at 22%.

The UTMA owes capital gains and nothing else. $60,867 after the exit tax at 18.

So the UTMA wins by $3,345 against the 12% line and $6,566 against the 22% line.

And there is a version where it wins by more. The kiddie tax stops applying once the kid is 18 with earned income over half their support, or once they turn 24 and are no longer a full-time student. After that a single filer's first $49,450 of taxable income is taxed at 0% on long-term gains.

Sell it then, on a low income, and the federal capital gains tax on our numbers is $0. The UTMA lands at the full $64,608, which beats the 529's non-qualified $57,522 by $7,086.

The 529 has softer exits than cashing out, and we covered them in custodial Roth IRA vs 529: change the beneficiary to a sibling, or move up to $35,000 into the kid's Roth IRA once the account is 15 years old. That article is about which account can take money first, and it is a different fight. This one is about who ends up with the money and what it costs to get it out.

What are the disadvantages of a UTMA account?

3 of them, and none is a tax.

It is not yours. California Probate Code 3911(b) and Florida Statutes 710.113(2) both say the property is indefeasibly vested in the minor. A 529 owner can change the beneficiary. A UTMA custodian cannot change who owns it, because that was settled the day the money went in.

The state sets the handover date. California hands custodial property over at 18 by default, and a gift transfer can only be delayed to 21. Florida's default is 21 and a transferor can push it to 25, at which point the kid can usually compel the whole thing at 21 anyway. That compel right has a catch. Fla. Stat. 710.123(3) lets the transferor take it away, by written notice given when the later age is elected, so a Florida kid facing 25 may have no right to force the money out at 21.

The FAFSA charges the kid's rate. 20%, with no protection allowance, every year the form is filed.

None of that shows up in the "flexibility" column of a comparison chart, which is where it lives on every other page. Flexibility is a nice word for the money being spendable, and at 21 the person doing the spending is not you.

What are the contribution limits on a UTMA vs a 529?

Neither has a federal annual cap, which is the boring correct answer nobody gives.

A UTMA has no statutory limit. A 529 has no federal yearly cap either, only 26 U.S.C. 529(b)(6), which requires a plan to have safeguards against contributions beyond what the kid's qualified education expenses would need.

What binds both is the gift tax. The 2026 annual exclusion is $19,000 per donor per kid, per Rev. Proc. 2025-32. $150 a month is $1,800 a year, so nothing here comes close.

The 529 has 1 trick the UTMA does not: 26 U.S.C. 529(c)(2)(B) lets a donor elect to spread a large contribution across 5 years of exclusions.

UTMA vs 529 vs Coverdell vs a trust: what else is on the table?

A Coverdell is a 529 with a much smaller door. 26 U.S.C. 530 caps it at $2,000 a year per beneficiary, bars contributions after the kid turns 18, and forces the balance out by 30. $2,000 a year is $167 a month, which is 1 reason it stopped being the default answer.

A trust is the grown-up version of what a UTMA does badly. It can set its own handover terms instead of taking the state's, and it can outlive the kid's 21st birthday. It also needs a lawyer, its own tax return, and a reason.

A UTMA is what people reach for when they want the trust outcome without paying for a trust. The state statute is the trust document, which is fine right up until you read the handover age.

Trump Accounts are the newest entry and run on different rules again. We put those against the 529 in Trump Account vs 529.

Can I roll a UTMA into a Roth IRA?

No. There is no such rollover.

IRS Publication 590-A says contributions to an IRA, other than rollover contributions, "must be in cash," and its list of eligible retirement plans a rollover can come from is IRAs, qualified trusts, 403(a) annuity plans, 457 plans and 403(b) plans. A custodial account is not on it.

What can happen is smaller and more useful. If the kid has taxable compensation, the custodian can sell UTMA holdings and use the proceeds to fund a custodial Roth IRA for that same kid, up to the smaller of the annual limit or the kid's pay.

That is a sale followed by a contribution, which the code treats as 2 separate events. The sale realizes gain under the same kiddie tax rules above, and the Roth is still the kid's money, because it always was.

What the math says

On $150 a month from birth to 18 at 7%, both accounts reach $64,608 and the UTMA's annual kiddie tax comes out at $0, because its biggest dividend year of $685 sits under the $1,350 dependent standard deduction. That $0 holds while the dividend yield stays under 4.18%, and the fund in the model pays 1.06%. The 529's advantage shows up at the exit and on the aid form: $3,741 of capital gains tax when the UTMA is cashed at 18, and a 4-year FAFSA gap of $21,323 for a family assessed at the top rate. Reverse the outcome and the UTMA takes it, by $3,345 against a 529 cashed out at a 12% rate and $7,086 if it is held until the kiddie tax no longer applies.

The variable that moves the answer is whether the money gets spent on school. The second one is whether the family qualifies for need-based aid at all, because the $21,323 is $0 for a family that does not. The third is the yield on whatever the UTMA holds, because that is the input the $0 is made of.

How we ran the numbers

Every figure here comes from a Python script that adds each month's deposit, grows the balance month by month, and applies the kiddie tax tier by tier at the end of each year. Nothing was estimated by hand.

Contribution: $150 at the end of each month for 216 months, birth to 18. $32,400 in total.
Return: 7% nominal a year, compounded monthly (0.5833% a month). A modeling assumption. Sensitivity run at 5% and 9%. $1 a month for 216 months grows to $430.72, which is how the threshold deposits of $296 and $591 were derived.
Both accounts earn the same 7%. The 529 balance at 18 is $64,608, of which $32,208 is earnings. That is the same figure carried on 3 other pages here.
Dividend yield: 1.06%, the 12-month trailing yield BlackRock published for the iShares Core S&P 500 ETF as of Aug 31, 2026. Applied to the year-end balance and treated as qualified dividends, reinvested, which raises basis. Basis at 18 is $37,652, which is $32,400 of contributions plus $5,252 of reinvested dividends.
Yield sensitivity. The $0 kiddie tax is a function of this 1 input. Solved on the $64,608 balance, the tax line breaks at a 4.18% dividend yield ($2,700 of dividends), or at 3.12% of the balance in realized distributions a year with the yield held at 1.06%. We ran the account at 2%, 3%, 4.18% and 5% yields. At 5% the lifetime tax is $113 and the balance is $64,493.
Turnover: 0 realized capital gain distributions in the base case. That is the assumption most favorable to the UTMA, and it matches the fund's record: across 108 quarterly distribution records back to June 2000, long-term capital gains are $0.000000 in every row, and short-term is $0.000000 in every row but 1, the $0.069200 paid on the Dec 15, 2000 record date. We also ran a churn case at 5% of the balance realized each year, which produced $408 of tax over 18 years and cost $435 of ending balance.
Kiddie tax, 2026: first $1,350 sheltered by the dependent standard deduction, next $1,350 at the kid's own rate (0% on qualified dividends and long-term gain, because the 2026 maximum zero rate amount is $49,450 of taxable income), everything above $2,700 at the parent's rate. The $1,350 is set by Rev. Proc. 2025-32. These amounts move with the tax year.
Parent rate: 15% on capital gain and qualified dividends. At a 0% parent band the UTMA exit tax is $0 and at 20% it is $4,988.
UTMA exit: the whole balance sold at 18, realizing $27,641, which is $26,956 of unrealized gain plus the year-18 dividend of $685. Tax is 15% of $24,941.
529 non-qualified exit: earnings taxed at a flat 12% (and 22% on 1 line) plus the 10% additional tax, applied to earnings only. Each one is the displayed $64,608 minus the displayed tax, so $32,208 at 22% combined is $7,086 and leaves $57,522, and $32,208 at 32% combined is $10,307 and leaves $54,301.
A 12%-bracket parent would usually sit in the 0% long-term capital gain band, which would drop the UTMA's exit tax to $0. We hold 15% on the UTMA in every scenario, which understates the UTMA and changes no verdict here.
FAFSA: 2026-27 rates. Student assets at 20%, parent assets at 12% then a 22% to 47% table for 2.64% to 5.64%. Asset protection allowance $0. Balance drawn down by a quarter each year, with no growth modeled during college, so each year's figure is 4/4, 3/4, 2/4 and 1/4 of the starting balance, rounded to the dollar. 1 scenario only, and it is the sell-at-18 scenario: the UTMA column runs on the post-tax $60,867 because the proceeds stay custodial property assessed at the student rate, and the 529 column runs on $64,608. Simplification: year 1 assesses the balance at 18, though in practice the first FAFSA is filed before college starts. Not modeled: families exempt from reporting assets, the -1,500 SAI floor, any school's own formula, and whether a school meets need.
No state income tax, no fees, no inflation adjustment. Every displayed dollar is rounded to the nearest $1, and every difference on this page is the subtraction of 2 displayed figures, so a calculator and this page agree.

Frequently asked questions

Is a UTMA or a 529 better?

For college, the 529 on our numbers. $150 a month from birth reaches $64,608 in both, and the 529 spends it on school untaxed while the UTMA owes $3,741 in capital gains at 18, before a 4-year FAFSA gap of $21,323 that only costs a family money if they qualify for need-based aid in the first place. For money not spent on school, the UTMA wins by $3,345.

Which is better for taxes, a UTMA or a 529?

The 529, and the edge arrives at the exit. At $150 a month and a 1.06% dividend yield the UTMA's kiddie tax over 18 years is $0, since its biggest dividend year of $685 is under the $1,350 dependent standard deduction, and it takes a 4.18% yield to change that. What the 529 saves is the $3,741 the UTMA's realized gain costs at 18, against $0 for money spent on school.

Who pays taxes on a UTMA account?

The kid, on their own return. Unearned income above $2,700 in 2026 is taxed at the parent's rate under the kiddie tax rules in the Instructions for Form 8615. A return is required once unearned income passes $1,350.

Does a UTMA hurt financial aid?

More than a 529 does. The 2026-27 SAI guide assesses a student's assets at 20% with no protection allowance, and the 2026-27 FSA Handbook says a UTMA counts as the minor's own asset. A parent 529 for that student adds up to 5.64%.

What are the contribution limits for a UTMA vs a 529?

Neither has a federal annual cap. The binding limit is the gift tax annual exclusion, $19,000 per donor per kid for 2026 under Rev. Proc. 2025-32. A 529 donor can also elect to spread 1 large gift across 5 years of exclusions under 26 U.S.C. 529(c)(2)(B).

What are the disadvantages of UGMA and UTMA accounts?

The transfer is irrevocable and the property is indefeasibly vested in the minor, the state sets the handover age, and the FAFSA assesses it at the 20% student rate. California hands it over at 18 by default and Florida at 21, with 25 available by election in some states.

Can I roll my UTMA into a Roth IRA?

No. IRS Publication 590-A allows only cash contributions plus rollovers from eligible retirement plans, and a custodial account is not one. A custodian can sell UTMA holdings and contribute the cash to a custodial Roth IRA if the kid has taxable compensation, which is a taxable sale followed by a contribution.

What is a UTMA vs 529 vs Coverdell?

A Coverdell is capped at $2,000 a year per beneficiary, takes no contributions after 18 and has to be emptied by 30, under 26 U.S.C. 530. A 529 has no federal yearly cap and no age limit. A UTMA has no cap and no education requirement, and the kid owns it.

Rules current as of Sep 2026: the 2026 kiddie tax amount is $1,350, so the threshold is $2,700, and the dependent standard deduction is the greater of $1,350 or earned income plus $450 (Rev. Proc. 2025-32). The 2026 maximum zero rate amount for capital gains is $49,450 of taxable income for a single filer and the annual gift tax exclusion is $19,000. Non-qualified 529 earnings are taxed plus 10% under 26 U.S.C. 529(c)(6) and 530(d)(4), and a Coverdell is capped at $2,000 a year. For the 2026-27 award year, student assets are assessed at 20% and a parent 529 at up to 5.64%. UTMA handover is 18 in California and 21 in Florida. Rates and limits move, so check the date on this line before you lean on it.

Sources