28It follows that the exercise of that option to derogate must be justified if the measures taken by the Member States for its implementation are not to undermine the objective of fiscal harmonisation pursued by the VAT Directive, and it cannot allow the Member States to exclude altogether reduction of the taxable amount for VAT purposes in the event of non-payment (judgment of 15 October 2020, E. (VAT – Reduction of the taxable amount), C‑335/19, EU:C:2020:829, paragraph 29 and the case-law cited).
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