Key legal question
Whether the tax authority could assess self-employment income by estimation due to unreliable documentation.
Extracted holding
Yes. Because the taxpayer's living expenses could not be plausibly financed from the documented income, the authority was entitled to make an assessment by estimation.
Extracted reasoning
The submitted records did not reliably establish the source of funds. The authority may rely on cash-flow, asset development, and living expenses when records are incomplete or inconsistent.