29Article 90(1) of that directive, which relates to cases of cancellation, refusal or total or partial non-payment, or where the price is reduced after the supply takes place, requires the Member States to reduce the taxable amount and, consequently, the amount of VAT payable by the taxable person whenever, after a transaction has been concluded, part or all of the consideration has not been received by the taxable person. That provision embodies one of the fundamental principles of the VAT Directive, according to which the taxable amount is the consideration actually received and the corollary of which is that the tax authorities may not collect an amount of VAT exceeding the tax which the taxable person received (judgments of 26 January 2012, Kraft Foods Polska, C‑588/10, EU:C:2012:40, paragraphs 26 and 27; of 15 May 2014, Almos Agrárkülkereskedelmi, C‑337/13, EU:C:2014:328, paragraph 22; and of 20 December 2017, Boehringer Ingelheim Pharma, C‑462/16, EU:C:2017:1006, paragraph 32).
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