South Korea’s National Tax Service ruled on August 28 that a resident holding crypto at an overseas exchange must still declare that account under the country’s foreign-account disclosure rules. The obligation applies even when the overseas exchange collapses and locks the holder out of trading or withdrawals. The ruling arrives months before Seoul begins taxing crypto gains in January 2027 — a start date that has already been postponed several times since the levy was first legislated.

Why must holdings be reported even if an exchange collapses?

The ruling stems from a question submitted by a Korean resident who was a creditor of an overseas crypto exchange that went bankrupt in November 2022. According to the National Tax Service, the resident held token balances on the platform before the collapse, later joined the estate’s distribution process, and began receiving partial payouts into a domestic foreign-currency account.

The resident asked the tax agency whether the reporting requirement for overseas financial accounts under Article 53 of Korea’s Act on International Tax Adjustment still applies when an account is stuck in bankruptcy limbo, where trading and withdrawals are impossible. The tax agency said yes, explaining that an account opened with a foreign virtual-asset service provider retains its reporting obligation, and the duty survives the operator’s bankruptcy.

What the disclosure rule requires

Korean residents and domestic companies must report overseas financial accounts when the combined balance exceeds 500 million won, roughly $350,000, at any month-end during the year. Filings must identify the foreign institution, the account, and the balance.

Digital assets have counted toward this regime since the 2023 reporting cycle. Self-custody wallets, however, are not included, as they are not accounts opened with a service provider.

The new ruling extends that framework, holding that insolvency does not release an exchange account from disclosure, even when the holder has effectively lost control of the assets. Failure to file can carry penalties calculated as a percentage of the unreported balance, so the stakes of getting disclosure right extend beyond paperwork.

A valuation headache for frozen balances

Reporting an account is not the same as owing tax on it. Still, some Koreans may struggle to prove that balances on overseas exchange accounts are already gone or inaccessible, because a bankrupt exchange’s interface may continue to display a customer’s original token balance long after the estate can no longer return the full amount. In some cases, the amount eventually distributed is only a fraction of the original balance.

This process can take years. The FTX estate, for example, only began paying creditors long after customers lost access to their funds.

According to the tax agency, Koreans reported 10.5 trillion won in overseas digital assets during the 2026 cycle, a 5.4% decline from a year earlier.

Separate from the 22% tax arriving in 2027

The disclosure rules are distinct from the planned levy on crypto profits, which has yet to come into force, as Cryptopolitan reports. From January 1, 2027, South Korea plans a combined 22% rate — 20% national plus 2% local — on annual gains above 2.5 million won.

The tax agency has not yet explained how it intends to handle staking, airdrops, or the calculation of acquisition costs. Critics argue that defining new taxable events through administrative notice conflicts with Korea’s “no taxation without law” principle. How those open questions — including the treatment of assets frozen in bankruptcy estates — get resolved will shape compliance obligations for Korean crypto holders as the 2027 deadline approaches.