The Income Tax Department has sent a communication to thousands of individuals who have undertaken cryptocurrency transactions but failed to reflect this income in their returns, official sources said Friday. These transactions pertain to assessment years 2023-24 and 2024-25, they said. The department and its policy-making body, the Central Board of Direct Taxes (CBDT), suspect tax evasion and money laundering by certain "high-risk" people who are potentially using "unaccounted" income to invest in virtual digital assets (VDAs), commonly known as cryptocurrency.