Organization Act of Directorate-General of Budget, Accounting and Statistics, Executive Yuan Article 3

The Directorate has one Minister with special appointment rank, and two Deputy Ministers, one of whom shall be equivalent to the rank of the 14th grade of selected appointment, and the other shall be with the rank of the 14th grade of selected appointment.
中文原文 行政院主計總處組織法第3條
總處置主計長一人,特任;副主計長二人,其中一人職務比照簡任第十四職等,另一人職務列簡任第十四職等。

English translation for reference only; the Chinese text prevails. Not legal advice.