How the DGT's position has evolved
Current position
Income from economic activities includes the self-publishing of books by the author. Administration and custody expenses for negotiable securities are deductible, but discretionary and individualized investment portfolio management is excluded. In associated labor cooperatives, income from worker-members is classified as income from employment rather than investment income.
The DGT's position does not show a single doctrinal evolution, as the rulings address heterogeneous scenarios within the concept of investment income. A constant delimitation is observed between investment income and income from employment or economic activities in cases involving intellectual property and cooperatives. The doctrine remains stable in distinguishing legal natures according to the specific applicable regulations.
Turning points
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Establishes that the self-publishing of books qualifies the income as economic activities, differentiating them from income from employment when a third-party publisher exists.
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Specifies that discretionary and individualized investment portfolio management is not a deductible expense, unlike administration and custody expenses.
Analysis based on 12 of 14 rulings with a stated position. Updated 26 September 2026.