Bithumb Prepared to Fight an 80.3 Billion Won Tax Assessment

South Korean cryptocurrency exchange Bithumb was preparing to contest an 80.3 billion won withholding-tax assessment tied to foreign customers, the Korea Times reported on December 29, 2019. The dispute put a concrete balance-sheet figure on an unresolved policy question: whether, and through what legal mechanism, South Korea could tax cryptocurrency activity before a dedicated tax framework had been enacted.

The assessment itself was not issued on December 29. Vidente, then the largest shareholder of Bithumb Holdings, had disclosed the matter on December 27, saying Bithumb Korea confirmed on November 25 that the National Tax Service had imposed approximately 80.3 billion won, including local tax, in connection with withholding on foreign customers’ income. December 29 was the date the intended challenge and the policy conflict entered the contemporaneous public record covered here.

What the assessment meant

Withholding tax normally makes the payer responsible for deducting tax before income reaches the recipient and remitting it to the government. Applied to an exchange, that approach shifted the immediate collection burden from individual foreign customers to Bithumb. The Korea Times reported that Bithumb would have to pay the assessed amount first; the practical mechanics of recovering it from customers were not established in the public record available on December 29.

Bithumb’s position was also only a contemporaneous claim, not a court finding. The newspaper reported that the exchange regarded the assessment as lacking a proper legal basis and was preparing arguments through available relief procedures. No filing or judgment had resolved that contention by December 29, and the 80.3 billion won figure was an assessed amount rather than a final adjudicated liability.

That distinction matters because the dispute joined several questions that were often blurred together in 2019: whether cryptocurrency was legally recognized as money or property, whether trading gains fit an existing income category, whether foreign customers were taxable in South Korea, and whether an exchange could be treated as the withholding agent. An answer to one question did not automatically settle the others.

Why it mattered for the industry

The assessment was more consequential than a routine company tax bill because it tested regulation through collection before lawmakers had produced a cryptocurrency-specific tax regime. On December 8, 2019, South Korea’s Ministry of Economy and Finance had said it would seek legal grounds for taxing income and transactions involving digital currency. The December 29 dispute therefore exposed a sequencing problem: the National Tax Service had acted while the broader statutory framework was still being discussed.

For exchanges, the institutional risk was direct. A platform could face a large obligation based on customer activity even when the underlying classification and collection method remained contested. For regulators, the case showed that existing rules for nonresident income and withholding might be used without waiting for a bespoke crypto statute. Neither implication established how another exchange, a Korean resident or a different transaction would be treated.

No cryptocurrency price reaction is claimed here. The surviving reports do not provide a controlled event window, a named trading pair or evidence that the assessment caused movement in bitcoin, Bithumb-listed assets or Vidente shares. Attaching a market move to the tax news would exceed the record.

Later institutional clarification

A February 17, 2020 analysis by South Korea’s National Assembly Budget Office described the action as the country’s first cryptocurrency tax measure. It said the National Tax Service treated nonresidents’ won withdrawals from Bithumb during 2015 through 2018 as other income and applied a 22% rate including local income tax, while treating Bithumb as the withholding agent. That official account clarifies the calculation and scope, but it is later context and was not available on December 29, 2019. It does not retroactively resolve whether Bithumb’s planned challenge would succeed.