National Internal Revenue Code (NIRC)
Section 4. Power of the Commissioner to Interpret Tax Laws and to Decide Tax Cases. - The power to interpret the provisions of this Code and other tax laws shall be under the exclusive and original jurisdiction of the Commissioner, subject to review by the Secretary of Finance.
The power to decide disputed assessments, refunds of internal revenue taxes, fees or other charges, penalties imposed in relation thereto, or other matters arising under this Code or other laws or portions thereof administered by the Bureau of Internal Revenue is vested in the Commissioner, subject to the exclusive appellate jurisdiction of the Court of Tax Appeals.