Lech Kaczyński was Chairman of NIK from 1992 to 1995. During his term of office, public confidence in NIK increased from 30% to 60%. During this period, under the auspices of NIK, the so-called Falzmann Symposia were organized (the name comes from Michał Falzmann, the Chamber auditor who uncovered the FOZZ scandal). He was the author of the NIK Act of 1994, thanks to which the institution gained its independence and political autonomy. This act set high working standards for NIK auditors.

On taking up his post, Lech Kaczyński said that NIK's structure was outdated and that it lacked information. The new people should be competent and not be associated with political parties.

In 1994, on the initiative of Lech Kaczynski, a new law on the Supreme Chamber of Control came into force, thanks to which the institution gained independence and political autonomy. This act set high standards for NIK auditors.

NIK's success during Lech Kaczyński's presidency was the inclusion of previously virtually uncontrolled areas, such as the army, the police and the border guard. In the years 1992-1994, as a result of NIK audits PLN 7200 billion recovered from various titlesIn the same period, the budget expenditure on NIK amounted to 1200 billion zlotys (these are the amounts before denomination). During Lech Kaczyński's presidency, NIK also audited, among other things, the Bank Śląski privatization scandal.