Can I Open a HYSA for My Child? Custodial Accounts and Taxes

Yes, you can open a high-yield savings account for your child at most banks and online institutions, usually as either a joint account with you as co-owner or a custodial account under your state’s Uniform Transfers to Minors Act or Uniform Gifts to Minors Act. The structure you pick decides who legally owns the money, how the interest gets taxed, and what your child can do with the balance once they become an adult. Three details tend to surprise parents: the interest is taxable, money in a custodial account belongs permanently to the child, and a larger balance can shrink college financial aid.

Joint Account or Custodial Account

The two common structures behave very differently, and the wrong choice is hard to undo.

Joint Accounts

A joint savings account lists you and your child as co-owners. You both have access, and you keep practical control over deposits, withdrawals, and settings. It works well for teaching a teenager how banking functions while leaving a safety net in place. Because the money isn’t locked into the child’s name, you can close the account or redirect the funds if your circumstances change.

Custodial Accounts

Custodial accounts opened under UTMA or UGMA follow a different rule: the child owns the money outright, and you manage it as custodian with a fiduciary duty to use the funds for the child’s benefit. Every deposit is an irrevocable gift. Once cash is in the account, you cannot take it back, even if your finances change or you disagree with how your adult child later spends it.¹ The Social Security Administration treats these transfers as irrevocable, meaning the donor gives up all control of the property and has no legal authority to reclaim it.²

A joint account gives you flexibility. A custodial account gives your child a legal right to every dollar in it. If you want to save for a goal like college but keep the option of redirecting funds, a joint account or a 529 plan is often a better fit than a UTMA or UGMA.

What You Need to Open the Account

Federal law requires banks to verify the identity of everyone tied to a new account. Under the Customer Identification Program rules created by the USA PATRIOT Act, a bank must collect at minimum the customer’s name, date of birth, address, and taxpayer identification number before opening an account.³

In practice, expect to bring:

For your child: Social Security number, date of birth, and sometimes a birth certificate or other identity document. Verification is risk-based, so some banks accept non-documentary methods while others want physical documents.
For you as parent or custodian: a government-issued photo ID such as a driver’s license or passport, your Social Security number, and current address and contact information.

When a parent opens an account on behalf of a minor, the bank generally treats the parent as the “customer” for identification purposes, though it may still need information about the child depending on the account type.³ Most banks let you apply online, though some still require notarized copies by mail if digital verification can’t confirm the details. Initial deposits are usually small, often a dollar to a few hundred dollars depending on the institution.

How the Interest Gets Taxed

Interest from a high-yield savings account is unearned income and is subject to federal tax. When the account belongs to a child, the IRS applies the so-called Kiddie Tax under 26 U.S.C. § 1(g) to keep parents from sheltering income in a child’s lower bracket.⁴

For the 2026 tax year, the thresholds work like this:

The first $1,350 of unearned income is tax-free, covered by the limited standard deduction for dependents.
The next $1,350, from $1,351 through $2,700, is taxed at the child’s own rate, usually the lowest bracket.
Everything above $2,700 is taxed at the parents’ marginal rate.

The IRS sets these thresholds each year through inflation adjustments.⁵

For most children whose savings account earns a few hundred dollars in interest, the whole amount sits inside the tax-free zone and no return needs to be filed. The Kiddie Tax matters mainly when the child’s total unearned income from all sources climbs past those thresholds.

Reporting the Child’s Income

If your child’s gross income is more than $1,350 but less than $13,500 for 2026, you can elect to report it on your own return by attaching Form 8814, which avoids filing a separate return for the child.⁶ The trade-off is that folding the child’s income into yours raises your adjusted gross income, which can affect other tax calculations. At $13,500 or more, the election is unavailable and the child must file their own Form 1040 with Form 8615 attached.⁷

Failing to report a child’s unearned income can trigger underpayment penalties and interest. If you elect to include the income on your return, adjust your withholding or estimated payments so you aren’t caught short the following April.⁶

When Your Deposits Count as Gifts

Every deposit into a custodial account is a completed gift for federal tax purposes. In 2026, you can give up to $19,000 per recipient per year without any gift tax filing. A married couple can each give $19,000, for $38,000 into one child’s custodial account with no paperwork.⁸

Exceed the annual exclusion and you must file Form 709, the federal gift tax return, for that year.⁹ Filing doesn’t necessarily mean tax is owed, because a large lifetime exemption absorbs most gifts, but skipping the form when it’s required is a compliance problem. Regular monthly deposits rarely bump against the threshold. It becomes relevant when grandparents or other relatives also contribute, or when a lump sum such as an inheritance lands in the account.

How the Account Affects College Financial Aid

This is where the account structure earns its keep. Under the federal Student Aid Index formula, student-owned assets are assessed at 20%, while parent-owned assets are assessed at 12%.¹⁰ Every $10,000 in a custodial UTMA or UGMA account cuts aid eligibility by roughly $2,000, compared with $1,200 for the same balance in a parent-owned account.

Parents also get an asset protection allowance that shields a portion of their savings from the formula entirely. Student-owned assets get no such allowance. A joint savings account, where the parent is a co-owner, is generally reported as a parent asset on the FAFSA. A custodial account is the child’s asset and gets the harsher treatment. If your child is likely to apply for need-based aid, that gap can cost thousands of dollars in grants over four years.

FDIC Insurance

Deposits in a custodial savings account are insured by the FDIC for up to $250,000 as the child’s own single account. For insurance purposes the child is the sole owner even though a custodian manages the funds, and the coverage is separate from the parent’s personal deposits at the same bank.¹¹ Joint accounts are insured per co-owner, so a parent-and-child joint account is covered up to $500,000 total. These limits rarely matter for a typical child’s savings, but they’re worth knowing if a large inheritance or gift may land in the account.

What Happens When Your Child Turns 18

Joint accounts usually don’t change at 18. Both owners still have access, and either can close the account. The informal arrangement continues.

Custodial accounts are different. State law requires the custodian to transfer full control to the child at the age set for the account, and the child can then spend the money on anything they choose. Most states set the default at 21, some use 18, and several let the custodian elect an age as high as 25 when the account is opened. If you don’t complete the transfer on time, the bank may restrict the account until you do.¹

This handover is the part that unsettles some parents. A young adult receives unrestricted access to money that may have grown for their entire childhood, and there’s no legal way to claw it back or attach conditions. If that worries you, check your state’s rules on the permissible transfer age before opening the account. A state that lets you set the age at 25 keeps the money under your management longer and gives your child more time to develop financial judgment.

Name a Successor Custodian

If the custodian dies or becomes incapacitated before the child reaches the transfer age, the account can freeze unless a successor custodian is on file. Most banks let you name one when you open the account or afterward. Skipping this step is a common oversight and can force the family into court to appoint a new custodian. If the child is 14 or older and no successor was named, many states allow the minor to designate a replacement.

1
Cornell Law School Legal Information Institute. Uniform Transfers to Minors Act
2
Social Security Administration. POMS SI 01120.205 – Uniform Transfers to Minors Act
3
Financial Crimes Enforcement Network. Guidance to Encourage Youth Savings and Address FAQs 2017
4
Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
5
IRS. Rev. Proc. 2025-32
6
Internal Revenue Service. 2025 Instructions for Form 8814
7
Internal Revenue Service. Form 8814 – Parents Election To Report Childs Interest and Dividends
8
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
9
Internal Revenue Service. Instructions for Form 709 (2025)
10
Federal Student Aid. 2026-27 Student Aid Index (SAI) and Pell Grant Eligibility Guide
11
FDIC. Single Accounts