Korea's ₩2.5M Capital Gains Deduction on Foreign Stocks — 2026 Guide for Overseas Koreans

If you are a Korean citizen holding US stocks — whether you live in Korea or abroad — understanding how Korea taxes foreign stock capital gains is essential. Miss the rules and you face unexpected tax bills and penalties. Master them and you can legally minimize your tax burden year after year.

This guide explains Korea’s ₩2.5 million (2.5 million won) annual capital gains deduction, the 22% effective tax rate, and practical strategies for tax-year optimization.

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Who Is Subject to Korean Capital Gains Tax on Foreign Stocks?

Korean Residents

Under Korean tax law, a resident is someone who has a domicile in Korea or who has a place of residence in Korea for 183 days or more during a tax year. Residents are taxed on worldwide income, which includes gains from selling US-listed stocks like VOO, VTI, SCHD, or individual equities.

Non-Residents and Expats

If you have genuinely relocated abroad and qualify as a non-resident, Korean capital gains tax generally does not apply to US stock gains (since those are foreign-source income). However:

• You must establish clear non-resident status with supporting documentation
• If you maintain significant ties to Korea (family, property, business), the NTS may challenge your non-resident claim
• Returning to Korea for extended periods can trigger residency status

When in doubt, consult a Korean tax accountant (세무사) before assuming you are exempt.

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The ₩2.5 Million Basic Deduction — How It Works

Under Article 118-2 of the Income Tax Act (소득세법 제118조의2), Korean residents who sell overseas-listed shares must report capital gains. The ₩2.5 million basic deduction reduces the taxable base each calendar year.

Calculation Formula

Taxable Base = Net Capital Gains − ₩2.5M Deduction − Necessary Expenses

Example:

You sell 50 shares of VOO in 2026, realizing a gain of ₩6 million (after converting USD gains to KRW at the spot exchange rate on the transaction date).

Net gain:         ₩6,000,000
Basic deduction:  ₩2,500,000
Taxable base:     ₩3,500,000
Tax (22%):        ₩770,000

If your gain were exactly ₩2.5 million or below, your tax bill is zero.

The Deduction Resets Every January 1

The ₩2.5M deduction applies per tax year (January 1 to December 31) and resets annually. This means spreading your profit-taking across multiple years is one of the most reliable ways to stay within or close to the deduction threshold.

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The 22% Tax Rate Explained

Korea applies a flat 22% effective rate on foreign stock capital gains:

Component	Rate
Capital gains tax	20%
Local income tax (10% of capital gains tax)	2%
Effective total	22%

This is a flat rate — not a progressive bracket system. The gain is also separately taxed from ordinary income such as employment wages or business income. High earners benefit because their marginal ordinary income rate (up to 49.5% for the top bracket) does not apply here.

For comparison, the US long-term capital gains rate for most investors is 15%. Korean investors who hold US stocks and are subject to Korean tax face a higher effective rate, making the deduction and loss-harvesting strategies even more important.

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Strategy 1 — Spread Gains Across Tax Years

If you have a large unrealized gain in an ETF like VTI or SCHD, consider selling in tranches across multiple December/January periods rather than all at once.

Scenario:

• Unrealized gain: ₩12,000,000
• Sell-all-at-once tax: (₩12M − ₩2.5M) × 22% = ₩2,090,000
• Spread over 5 years (₩2.4M per year): Each year stays under ₩2.5M threshold → ₩0 tax total

The trade-off is market exposure risk during the extended sale period. For long-term ETF holders who plan to stay invested anyway, partial sales with same-day or near-term repurchase (see below) can achieve basis-reset goals with minimal market timing risk.

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Strategy 2 — Loss Harvesting to Offset Gains

Capital losses and capital gains from overseas stocks are netted within the same tax year. If you have a losing position, selling it before December 31 reduces your net taxable gain.

Example:

Position	Result
VOO sold	+₩5,000,000 gain
Individual stock X sold	−₩3,000,000 loss
Net gain	₩2,000,000
After ₩2.5M deduction	₩0 taxable

By harvesting the loss in the same year, you reduced your effective tax to zero.

No Wash-Sale Rule in Korea

Unlike the US (where the IRS denies loss deductions if you repurchase the same security within 30 days), Korea has no wash-sale rule. You can sell a losing position, lock in the tax loss, and immediately repurchase the same ETF or stock. The practical constraints are:

• Brokerage commissions on both legs
• Exchange rate movement between sale and repurchase
• Possible slippage on limit orders

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Strategy 3 — Year-End Sell and Rebuy to Reset Cost Basis

If you own a position with significant embedded gains, consider selling before December 31 to utilize the annual ₩2.5M deduction and immediately repurchasing to establish a higher cost basis. This reduces your future taxable gain.

Example — VOO position:

• 100 shares, average cost basis $400, current price $500
• Sell 25 shares: gain = 25 × $100 = $2,500 ≈ ₩3.4M
• After ₩2.5M deduction: ₩900,000 taxable → ₩198,000 tax
• Repurchase 25 shares at $500: new basis is $500 for those shares
• Future gain on that tranche now starts from $500 instead of $400

Each year you can chip away at your embedded gain while keeping total tax below what a one-time liquidation would cost.

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Filing: Korea’s May Deadline

Who Files

Korean residents who realized any net capital gain from overseas stocks during the prior calendar year must file — even if the gain is below ₩2.5M (in which case tax is zero, but filing is technically still required for transparency).

Filing Window

May 1 – May 31 each year (reporting on the prior year’s January–December transactions)

How to File

1. Log in to Hometax (hometax.go.kr) — accessible from overseas with a valid Korean login credential or via the NTS overseas assistance service
2. Navigate to: Tax Filing → Capital Gains Tax → Overseas stocks
3. Gather your brokerage’s annual trading history statement (연간 거래내역서) — available from your Korean brokerage (Kiwoom, Samsung Securities, Mirae Asset, etc.) or foreign brokerage statements if you invest via an overseas account
4. Enter acquisition price, disposal price, and brokerage commissions (in KRW using the exchange rate on each transaction date — use the Bank of Korea basic rate / 기준환율)
5. Calculate, review, and pay

Exchange Rate Rule

All USD amounts must be converted to KRW using the Bank of Korea basic rate (매매기준율) on the date of each transaction. Acquisition and disposal may have different exchange rates, so the KRW gain can differ from what the USD gain suggests.

Penalties for Late or Non-Filing

Violation	Penalty
Non-filing by May 31	20% of tax owed
Underpayment	10% of shortfall
Daily delinquency surcharge	0.022% per day

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Foreign Tax Credit — Dividends vs. Capital Gains

US Dividend Withholding

When US stocks pay dividends, the US withholds 15% tax (under the Korea-US income tax treaty). This is credited against your Korean income tax when you file your comprehensive income tax return.

This is entirely separate from the capital gains deduction and cannot offset capital gains tax.

Income type	Korean tax	US withholding	Credit available?
US dividends	~15.4% (separate taxation elected)	15%	Yes, against income tax
US stock gains	22% flat	None	No (US does not withhold on gains for non-US persons in most cases)

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Common Mistakes to Avoid

1. Forgetting to convert to KRW All gains must be reported in Korean won. Using USD figures results in an incorrect return.

2. Not netting losses If you sold a losing position in the same year, it offsets your gains. File both together.

3. Confusing dividend income with capital gains These are different income types with different tax treatments and different reporting forms.

4. Missing the May 31 deadline The 20% non-filing penalty is severe. Set a calendar reminder every April.

5. Ignoring brokerage commissions as deductible expenses Trading commissions are necessary expenses and reduce your taxable gain.

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Related Posts

• Complete Guide to Stock Capital Gains Tax in Korea 2026
• Tax-Efficient Dividend Investing 2026 — Build a Low-Tax Portfolio
• VYM vs SCHD Dividend ETF Comparison 2026

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Key Takeaways

Korea’s ₩2.5 million (~$1,800 USD) annual capital gains deduction on foreign stocks is modest but powerful when used strategically:

• Stay under ₩2.5M per year with partial sales to owe zero tax
• Harvest losses before December 31 to offset gains
• Sell and repurchase to reset your cost basis — no wash-sale rule applies
• File by May 31 — the penalties for missing this are steep
• Keep records of all transaction dates, prices, and exchange rates

For Korean expats and non-residents, residency status is the threshold question. If you are a Korean resident for tax purposes, these rules apply regardless of where the stocks are listed or where you physically live.

This article provides general tax information for educational purposes. Individual circumstances vary and this does not constitute tax advice. Consult a licensed Korean tax accountant (세무사) for your specific situation.