Article 14 of Kuwait's Income Tax Decree No. 3 of 1955 establishes a definitive transition from prior tax legislation. It specifies that the provisions of the Kuwait Income Tax Decree, 1951, are rendered inapplicable for any taxable period ending after 31 December 1954. The primary function of this article is to formally substitute the 1951 decree with the new legislative framework, ensuring legal certainty and preventing legislative overlap. This provision confirms the 1955 decree as the sole governing income tax law from that date forward. A supplementary note clarifies that the Arabic text prevails in interpretation disputes.