A South Korean presidential office official in Seoul identified the absence of U.S. tax data as the primary obstacle to implementing the country's planned crypto taxation regime. The United States reportedly will not begin its first cryptocurrency data exchange under the OECD framework until 2029. Officials warn that launching the tax in 2027, before international data sharing is operational, would effectively concentrate the burden on users of domestic exchanges alone, creating an uneven playing field for Korean traders compared to those using offshore platforms.