NIEMIEC, Mateusz. The mechanism of settling tax on goods and services in the relationship between the investor – main contractor (buyer of construction services) and another contractor in the light of legal changes in force from January 1, 2017. State and Local Government Budget Law. Online. 21 November 2018. Vol. 6, no. 3, pp. 89-113. [Accessed 7 July 2025]. DOI 10.12775/PBPS.2018.018.