Nita A. The importance of proper documentation of tax deductible costs for shaping the tax base in personal income tax. Gloss to the judgment of the Provincial Administrative Court in Poznań of 10 September 2020, reference number I SA/Po 334/20. KPP [Internet]. 2022 Aug. 16 [cited 2024 May 17];(3):151-62. Available from: https://czasopisma.uni.lodz.pl/tax/article/view/14139