How Korea Taxes Gifted and Inherited Stock: The 4-Month Average Price Rule

Every so often a news story breaks about a founder gifting shares to a child, and the commentary that follows almost always zeroes in on timing: why that particular week. More often than not, the stock happened to be trading at a depressed level. Handing over the same number of shares at a lower reference price means a smaller tax bill — but to understand why that lever exists at all, you need to know that Korean tax law doesn't value a gift or inheritance of listed stock using the closing price on the day the transfer happened. This lesson isn't a guide to timing a gift or inheritance for tax savings; that's a question for a tax professional working with your specific numbers. The goal here is to walk through how Korean law actually prices listed stock for gift and inheritance tax purposes, and what exemptions and brackets sit on top of that valuation.

Why the Closing Price on the Transfer Date Isn't the Answer

Before any gift or inheritance tax can be calculated, the transferred asset needs a price tag. For real estate, the number barely moves from day to day, so this is a minor issue. A stock, by contrast, can swing meaningfully within a single session and from one day to the next. If the law simply used the closing price on the exact day of the gift or death, two people transferring the identical stock could end up with wildly different tax bills purely because of which day the market happened to be up or down on. Worse, pinning the entire valuation to one specific day creates an obvious incentive: push the price down on that one day, then transfer. To close off both problems, Korea's Inheritance and Gift Tax Act requires listed shares to be valued using an average over a window of time, not a single day's print.

The Core Mechanism: A 4-Month Average Centered on the Valuation Date

Here's how it works in practice. For an inheritance, the valuation date is the date of death. For a gift, it's the actual date the shares change hands. From that date, the law looks two months backward and two months forward — four months total — and averages every daily closing price the Korea Exchange published across that entire window. The whole point is to flatten out the number: instead of one day's price deciding the tax bill, four months of trading history does. If the stock happened to be unusually cheap on the exact transfer date but traded at consistently higher levels across the surrounding four months, the valuation lands closer to that higher level, not the cheap one-day print. The reverse holds too — an unusually high price on the transfer date gets pulled back down if the surrounding months were generally lower. The point is that no single day, including the transfer date itself, controls the outcome; the overall price level across the whole window does.

Working Through the Math

Here's a simplified, hypothetical example to make the mechanism concrete. A parent gifts 1,000 shares of Company A to a minor child, and the closing price on the actual gift date happens to be ₩100,000. But the average closing price over the two months before that date was ₩92,000, and the average over the two months after was ₩88,000. Averaging those two periods together gives a four-month valuation price of ₩90,000 — not the ₩100,000 closing price on the gift date itself. Based on the day-of price, the taxable asset would look like ₩100 million; based on the actual tax-law valuation, it's 1,000 shares × ₩90,000 = ₩90 million. In this example, the stock happened to be drifting down across the window, so the four-month average landed below the single-day price — but if the stock had instead rallied in the two months after the gift, the average could just as easily have landed above it. Because nobody can know in advance how the stock will move in the two months following the chosen date, this structure makes it effectively impossible to simply cherry-pick one favorable day's price.

Gift Tax Exemptions: How Much Can Move Tax-Free

A valuation isn't automatically taxable in full. Measured over a rolling 10-year period per recipient, a certain amount can pass tax-free before any rate applies. The commonly cited exemption thresholds are ₩600 million between spouses, ₩50 million from a parent (or other lineal ascendant) to an adult child, ₩20 million to a minor child, ₩50 million from a child to a parent, and ₩10 million for other relatives. Since 2024, an additional marriage-and-childbirth gift exemption of up to ₩100 million has existed on top of the standard child exemption, meaning an adult child who meets the marriage or childbirth conditions can in some cases receive up to ₩150 million tax-free. Returning to the example above, a ₩90 million gift to a minor child would have ₩20 million exempted, leaving a taxable base of ₩70 million. These exemption amounts and the list of qualifying relatives have been revised by lawmakers more than once, so treat the figures here as a reference point for the mechanism rather than the exact current limit — confirm the year's actual threshold through the National Tax Service or the current statute before relying on it.

The Rate Structure: Only the Excess Gets Taxed at the Higher Rate

Gift tax and inheritance tax share the same five-bracket progressive rate structure. The commonly cited brackets are 10% up to ₩100 million, 20% from ₩100 million to ₩500 million, 30% from ₩500 million to ₩1 billion, 40% from ₩1 billion to ₩3 billion, and 50% above ₩3 billion. The key word is progressive: crossing a bracket threshold doesn't mean the entire amount gets taxed at the higher rate — only the portion above that threshold does. So a taxable base that just barely crosses into the next bracket doesn't suddenly multiply the total tax bill. In the running example, a ₩70 million taxable base falls entirely within the first bracket, so a flat 10% applies to the whole amount. On top of that, filing on time within the statutory deadline earns a discount on the calculated tax — commonly cited as 3% of the tax due. The exact discount rate and bracket mechanics are adjusted periodically, so treat this section as the shape of the system rather than a number to plug into an actual filing without checking current guidance.

Missing the Filing Deadline Costs You, Regardless of the Math

Getting the valuation and bracket math right doesn't help if the filing itself is late. Gift tax must be filed within three months of the last day of the month in which the gift occurred; inheritance tax must be filed within six months of the last day of the month in which the death occurred (nine months if the deceased or the heir resides abroad). Filing on time is what earns the roughly 3% discount mentioned above — miss the deadline, and not only is that discount gone, but a late-filing penalty (commonly around 20% of the calculated tax) gets added on top. In other words, no matter how precisely the four-month average is calculated, filing late turns the whole exercise into a worse outcome than simply filing correctly and on time.

Why Families Often Time Gifts to Depressed Prices

Understanding this valuation mechanism also explains an argument that comes up in Holding Company Discounts and discussions of the so-called Korea Discount: that a controlling family facing an eventual succession has limited incentive to push its own stock price higher. The lower the four-month average around the valuation date, the smaller the taxable base for transferring the same stake — which is why gifts and inheritances of controlling stakes are sometimes reported around periods of depressed prices or events that weighed on the stock, such as a cross-listed subsidiary or a new exchangeable bond issuance. That said, this isn't an unlimited lever. Korea's 2026 tax reform proposals include provisions aimed at companies whose share price has stayed persistently low relative to their sector, or whose price appears to have been artificially suppressed shortly before a transfer — in such cases, the proposal would require using a longer-period average or a markup on the current valuation, whichever is higher, instead of the simple four-month window. This is still under legislative discussion as of this writing, and the final rules and their exact triggers may change, so don't treat any specific news report on it as settled law.

One More Layer for Controlling Shareholders: The Premium

Gifts or inheritances of a controlling shareholder's stake — the shares that come with actual management control — have historically been subject to an additional valuation premium, commonly cited at around 20%, on top of the standard calculation. The logic is that a controlling stake is worth more than an equivalent number of shares held by a passive minority investor. This premium carries exceptions for smaller companies, and proposals to abolish it entirely — generally framed as support for business succession — have appeared repeatedly in recent tax reform discussions. Whether it currently applies, and at what rate, is genuinely in flux, so anyone dealing with a controlling-stake transfer should check the statute at the time rather than assume the 20% figure cited here still holds.

Unlisted Shares Use a Different Yardstick

Everything above applies to shares that trade daily on an exchange. Privately held, unlisted shares have no daily market price to average, so they're valued differently — generally using an actual recent transaction price where one exists, or otherwise a weighted blend of the company's net asset value and a net-profit-based value derived from its recent earnings history. Companies with heavy real estate or securities holdings are weighted differently still. Because these rules get considerably more involved, valuing unlisted shares for a gift or inheritance is typically handled by a professional appraiser rather than worked out from general principles.

Takeaway

• Korea values a gift or inheritance of listed stock using the average closing price over the two months before and two months after the valuation date (the gift date, or the date of death) — not the closing price on that date itself.
• This four-month window exists specifically to prevent a single day's price, deliberately engineered or not, from determining the entire tax bill; the valuation can land above or below the single-day price depending on how the stock moved.
• Gift tax exemptions (commonly ₩600 million between spouses, ₩50 million to an adult child plus a possible ₩100 million marriage/childbirth add-on, ₩20 million to a minor child) apply before a five-bracket progressive rate (10% to 50%) is applied to the remainder, and filing late adds a penalty on top of losing the on-time filing discount.
• Controlling shareholders face an additional valuation premium, and Korea's 2026 reform proposals target companies with persistently suppressed share prices — both areas where the applicable rules are actively changing, so confirm current law before relying on any figure in this lesson.

FAQ

If the stock price spikes on the exact day of the gift, does filing that day lock in a lower tax bill?

No. The valuation isn't based on the closing price on the gift date — it's the average across the two months before and two months after. Whatever happens to the stock in the two months following the gift still feeds into the final valuation.

If stock gifted to a minor child is later sold, does the cash belong to the child?

Legally, yes, assuming the gift itself was properly executed — the shares and any proceeds from selling them belong to the child. If a parent later uses that money for other purposes, however, it can raise separate gift-tax or nominee-holding issues, so it's safer to keep the funds clearly separated and documented as the child's own.

Can you get a refund if the stock price drops after the gift is made?

Generally, no. The gift tax is fixed based on the four-month average around the valuation date, and a price decline afterward doesn't trigger a recalculation once that's been filed. That's part of why the timing decision should weigh how the stock might move over the following two months, not just its price on the intended transfer date.

Does the controlling-shareholder premium apply to an ordinary minority shareholder's stock too?

No. The premium applies specifically to a controlling shareholder and related parties' stakes. An ordinary minority shareholder's shares are valued using only the standard four-month average described above.

⚠️ This article is for informational and educational purposes only and does not constitute investment or tax advice. The exemption amounts, tax brackets, and premium rates described here are reference points for explaining the mechanism and are subject to change with tax-law amendments. Confirm the exact rules in effect at the time of any actual gift or inheritance filing with the National Tax Service and a qualified tax professional.