Steuerrecht
Koning attended the Praedinius Gymnasium in Groningen from April 1946 until May 1952 and applied at the in Rotterdam in June 1952 and simultaneously applied at the Leiden University in July 1952 majoring in Tax law and obtaining an Bachelor of Laws degree in June 1954 before graduating with an Master of Laws degree in July 1958. Koning worked as a civil servant for Tax and Customs Administration of the Ministry of Finance from August 1958 until February 1967. Koning served on the Provincial-Council of South Holland from 2 June 1966 until 4 January 1968.