The method for calculating the amount of the income basic tax by a profit- seeking enterprise as prescribed in Article 8 of the Act is formulated as follows:
The Amount of Income Basic Tax = (the Amount of Basic Income – NT$ 500,000) × tax rate
The amount of tax levied on foreign-sourced incomes under Paragraphs 9 and 10 of Article 5 of these Rules, the amount of the provisional income tax payment not yet offset, and the withholding income tax amount not yet offset, may be deducted from the amount of income tax difference calculated in accordance with Paragraph 1, Article 4 of the Act when calculating the amount of payable income tax, and shall be paid up by a profit-seeking enterprise before filing its annual income tax return.