Context: What’s Changing in Korea’s Crypto Tax Regime
The National Tax Service’s (NTS) published guidelines in recent weeks make clear that from January 1, 2027, all gains from the sale, exchange, or lending of virtual assets (cryptocurrencies, tokens, etc.) by residents will be taxed as ** 기타소득 (other income), separately assessed** rather than being lumped with salary or capital gains. (nts.go.kr) For non-residents or foreign legal entities, similar activities involving domestic virtual asset service providers will be taxed at source under a withholding scheme. (nts.go.kr)
Key Rules Every Crypto Holder Should Understand
| Topic | Details | Why It Matters |
|---|---|---|
| Acquisition cost baseline | If you held crypto before Jan 1, 2027, your base cost for calculating gains will be the higher of (a) original purchase cost or (b) the market-price (“시가”) at December 31, 2026. (nts.go.kr) | Locks in a usable value to reduce taxable gains for early adopters, especially if crypto has surged in value. |
| Cost accounting method | For crypto acquired after the start date, you may use moving-average cost method or FIFO (first in first out) to track acquisition cost — depending on your wallet or account. (nts.go.kr) | Different methods can lead to materially different taxable gains particularly in volatile markets. |
| Deductible expenses / 필요경비 | Generally includes acquisition cost and transaction costs. But if costs are difficult to document, you may apply a deemed expense equal to a percentage of gross proceeds (up to 50%), but no separate incidental costs allowed in that case. (nts.go.kr) | People using decentralized exchanges, peer-to-peer trades, or non-custodial wallets should carefully document fees, or accept more conservative deemed expense. |
| Tax rate & minimum threshold | Tax rate is fixed at 20%, with a basic exemption of KRW 2,500,000 (per year) in other income for residents. (nts.go.kr) | If your net crypto gains are under exemption, you may avoid tax entirely; otherwise, plan for withholding or provisional payments. |
Implications for Non-Residents & Foreign Entities
- If you are a non-resident or foreign legal entity and generate crypto income via domestic VASPs (virtual asset service providers), those providers are required to withhold tax at either a flat rate or based on the listed formula (whichever yields higher). (nts.go.kr)
- If your home country has a tax treaty with Korea, you may be eligible for reduced withholding or exemptions, especially for passive income or gains. Be ready to file a 비과세·면제 신청서 (tax treaty application) with the Korean provider. (nts.go.kr)
Practical Steps Now
- Inventory your crypto holdings as of Dec 31, 2026 — note acquisition cost, date, transaction fees. If records are missing, the market-price fix will apply.
- Decide your cost method – moving average vs FIFO; plan when to sell or lend.
- Estimate annual gains vs exemption threshold to budget for taxes.
- Document everything: wallet transfers, transaction costs, exchange fees.
- If non-resident, check treaty status with Korea, and prepare to file necessary forms with the VASP.
Case Example
- Alice bought 1 ETH in 2021 for KRW 300,000. On December 31, 2026, its market price is KRW 1,000,000. If she sells 1 ETH for KRW 2,000,000 in mid-2027: authoritatively, her acquisition cost is the higher value of original cost vs Dec 31, 2026 price → so KRW 1,000,000.
- She has KRW 2,000,000 proceeds less acquisition cost KRW 1,000,000 = KRW 1,000,000 gain. Thereafter deduct costs (fees etc.). If under exemption KRW 2.5M, no tax; otherwise taxed 20% on net gain.
Summary: Don’t Wait — Take Action Before 2027
This transformative change gives you just a few months to prepare your records and adjust. Proper planning now can significantly reduce surprises and optimize your tax position when the new regime kicks in on January 1, 2027.