35That interpretation is consistent with case-law holding that the right to deduct provided for in Article 17 et seq. of the Sixth Directive, which is an integral part of the VAT system and may not in principle be limited, must be exercised immediately in respect of all the taxes charged on transactions relating to inputs (see, inter alia, Case C-97/90 Lennartz [1991] ECR I-3795, paragraph 27, and Case C-409/99 Metropol and Stadler [2002] ECR I-81, paragraph 42). The exercise of that right assumes that, in principle, taxable persons do not make payment and therefore do not pay input VAT until they have received an invoice, or another document which may be considered to serve as an invoice, and that the VAT cannot be regarded as being chargeable on a given transaction before it has been paid.
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