Ewolucja normatywnej definicji pojęcia kosztów uzyskania przychodów w polskich podatkach dochodowych od 1920 roku
The Evolution of the Normative Definition of Concept of the Tax Deductible Costs in Polish Income Taxes Since 1920

Summary/Abstract: The text concerns the formation of the legal definition of the concept of tax deductible costs in personal and corporate income tax. The author analyzes the legal acts regulating this tax, enacted from the time of the rebirth of the Polish state to the present day, and shows how the current understanding of this concept has been influenced by historical definitional solutions. The historical-legal and dogmatic-legal methods were used. The author of the article demonstrates that the current understanding of the legal provision defining the concept of tax deductible costs is not only the result of judicature considerations, but also the work of the legislator. The final part of the article emphasizes the importance of analyses of tax law concepts in the historical context and formulates a de lege ferenda conclusion regarding the examination of structural solutions of other elements of income tax.

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