C-661/18CTT - Correios de Portugal v Autoridade Tributária e Aduaneira

Domstolens egne nøkkelord

Reference for a preliminary ruling — Value added tax (VAT) — Directive 2006/112/EC — Deduction of input tax — Article 173 — Mixed taxable person — Deduction methods — Pro rata method — Deduction on the basis of actual use — Article 184 to Article 186 — Adjustment of deductions — Change in the factors used to determine the amount to be deducted — Output transaction incorrectly regarded as VAT-exempt — National measure prohibiting a change in the deduction method for years that have already elapsed — Limitation period — Principles of fiscal neutrality, legal certainty, effectiveness, and proportionality.

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