When the trustee calculates various income amounts of the beneficiary in accordance with Paragraph 1, Article 3-4 of the Act, the trustee accounting system may adopt either a cash or accrual basis, which shall not be changed once determined. The term for income calculation shall commence on the first day of January and end on the thirty-first day of December of each calendar year.
When the trustee calculates various income amounts of the trust property in accordance with Article 3-4 of the Act, the related costs, necessary expenses and losses shall be deducted from entries under corresponding income categories in accordance with the proportion of amounts under various income categories to the gross income derived from the trust property, except for what can be directly, reasonably and clearly categorized that may be individually categorized, recognized and deducted.