Plenty of families quietly build up New Year's money or allowances in an account under their child's name. More recently, more parents are also opening accounts in their child's name and putting the money into stocks or funds to grow over the long term. The catch is that once that money passes a certain amount, the moment a parent deposits it, it legally counts as a gift under tax law. Plenty of parents think, "It's just my own money moved into my kid's name anyway," and put off filing -- but if that account later catches the National Tax Service's attention, the burden can end up bigger than expected.

Why 'Just Setting It Aside' Becomes a Problem -- What Counts as a Gift

Korea's Inheritance Tax and Gift Tax Act treats any transfer of property without consideration as a gift at the moment it happens. That applies whether a parent deposits cash into a child's account or buys stock and puts it under the child's name. Even if the child never actually withdraws or spends the money, it's treated as a gift the moment the money enters the account and becomes attributed to the child as their own property. Regardless of the parent's intent -- "I was just going to give it to them later when they needed it" -- the key point is that tax law judges based on the deposit date itself.

The Minor Child's Deduction Is ₩20 Million, Based on a 10-Year Total

When a lineal ascendant gives property to a child, a gift-property deduction applies. If the child is a minor (under 19), the deduction is ₩20 million over 10 years; if the child is an adult, it's ₩50 million over 10 years, tax-free. This deduction is calculated by combining gifts from all lineal ascendants together -- father, mother, grandparents, and so on -- so you can't assume "I'll get a separate deduction if I receive ₩10 million from mom and another ₩10 million from dad." What matters is whether the total amount received from multiple people within the same 10-year window exceeds the deduction limit.

Thought You Didn't Need to File? Here's How the Tax Authority Finds Out

Skipping the filing might seem harmless for now, but a child's account can come to light through several routes. A common one is later, once the child becomes an adult and spends a large sum on something like a jeonse deposit, a car, or a down payment on a home -- the National Tax Service can require proof of where that money came from. If a large flow of funds suddenly appears in an account that had no income during the child's minor years, it easily becomes a target for a fund-source investigation, and if there's no gift tax filing history, the entire accumulated amount can end up taxed all at once. Account-opening records and fund transfer history at securities firms and banks are also among the materials checked during that process.

The Gift Tax Filing Deadline -- Three Months From the End of the Month You Received It

Gift tax must be filed within three months from the end of the month in which the gift was received. For example, if money exceeding the deduction limit was deposited into a child's account sometime in September, the filing deadline would be the end of December. Some people figure that if the amount stayed within the deduction limit (₩20 million for a minor), there's little practical benefit to filing since the tax due is zero -- but many advise filing anyway, even within the limit, so you have clear proof of the fund source later. Filing can be done directly through Hometax or through a licensed tax accountant.

The Penalties That Apply If You Miss the Filing

If you exceeded the deduction limit and didn't file by the deadline, a 20% failure-to-file penalty gets added to the base tax. If it's judged to be wrongful conduct -- such as an attempt to conceal assets through a borrowed-name account -- the penalty rate can rise to 40%. On top of that, a late-payment penalty of 0.022% per day (roughly 8% annualized) accrues daily for however long the tax due goes unpaid. If a missed filing isn't discovered until years later, it's not unusual for the accumulated penalties to end up larger than the base tax itself.

If It Comes to Light Even Later -- The Assessment Period Can Run Up to 15 Years

There's also a limit on how long the tax authority can assess a tax. In principle, inheritance and gift tax can no longer be assessed once 10 years have passed from the date the tax could first be assessed. However, if the tax was evaded through wrongful conduct, or if the statutory return itself was never filed at all, that period extends to 15 years. In other words, "you're safe once you clear 10 years" only applies if you filed properly in the first place -- if you never filed at all and time simply passed, you can remain subject to investigation for a much longer stretch.

If You're Currently Managing a Child's Account, Here's What to Check

Building up assets under a child's name isn't a problem in itself. But it's worth distinguishing that programs like the Didim Seed Savings Account, where the government provides matching support, are treated completely differently under tax law from a parent directly gifting money. If the money is meant for education costs, it's worth checking whether it qualifies for the education expense tax credit first, so you don't miss out on a benefit you could otherwise double up on. And if you're planning funds around the time of college enrollment, the income-assessment standard used for national scholarships is also worth reviewing alongside your family's overall asset picture.

In Summary

Depositing money into a child's own account is treated as a gift at the moment of deposit, and a minor child's deduction is capped at ₩20 million over 10 years. The filing deadline is three months from the end of the month the gift was received; missing it adds a 20% failure-to-file penalty (40% for wrongful conduct) plus a daily late-payment penalty. If no return was ever filed, the period during which the tax authority can assess the tax can extend up to 15 years. This article summarizes general standards -- actual filing obligations and tax amounts vary depending on the child's age, timing of the gift, and family composition, so please confirm your specific case individually through the National Tax Service Hometax counseling center (126) or a licensed tax accountant.