37In this regard, it must be noted that Article 90(1) of the VAT Directive, which relates to cases of cancellation, refusal or total or partial non-payment, or cases 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 (judgment of 6 December 2018, Tratave, C‑672/17, EU:C:2018:989, paragraph 29 and the case-law cited).
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