South Korea is moving closer to implementing its long-delayed cryptocurrency tax regime, with authorities now building the technical and reporting infrastructure ahead of a planned January 2027 start. The National Tax Service (NTS) has begun developing data systems to collect exchange information, integrate blockchain analytics, and prepare cross-border reporting under the OECD’s Crypto-Asset Reporting Framework (CARF).
Under the current plan, taxpayers would begin filing crypto income in May 2028, covering gains from trading, transfers, and lending activities. However, major gaps remain in how broader onchain activity will be taxed, particularly in decentralized finance, staking, airdrops, NFTs, and protocol-based rewards, where formal guidance is still absent.
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Exchange-based taxation framework takes shape ahead of rollout
The initial tax structure focuses on centralized exchange activity, where gains from crypto-to-fiat and crypto-to-crypto trades will be taxed as “other income” at a flat 22% rate above a basic threshold. Cost basis will be calculated using standardized methods, with average cost applied for exchange transactions and first-in-first-out rules for other holdings.
Authorities are simultaneously building an integrated virtual asset analysis system designed to consolidate exchange data with blockchain-level transaction tracking. The system is intended to flag anomalies, trace wallet activity, and match domestic reporting with offshore data shared through CARF starting in 2027.
DeFi and onchain activity remain unresolved ahead of implementation
Outside centralized trading, most onchain activity remains legally undefined. Staking rewards, lending income, liquidity provisioning, and NFT transactions currently lack specific taxation rules, leaving significant ambiguity in how income will be classified and calculated.
Regulators are expected to rely heavily on foreign precedents, particularly the United States, where a self-reporting model governs most decentralized activity. However, South Korea has not yet confirmed whether similar principles will be formally adopted, or whether DeFi will be treated under existing “other income” provisions without separate classification.
Notably, South Korea’s tax authority is turning to artificial intelligence to strengthen oversight of cryptocurrency transactions as the country prepares to finally implement a long-delayed tax on digital asset gains.
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