Article 47 mandates that a Taxable Person must adjust their previously deducted Input Tax if the factors determining the deduction change after the supply. This adjustment is required for events such as the cancellation or rejection of a supply, a reduction in the supply consideration post-supply, or the non-payment of consideration as specified in Article 27(3). It also applies when the use of Capital Assets is altered. However, no adjustment is necessary for goods lost, damaged, or stolen (subject to Member State conditions) or for goods used as samples or gifts of insignificant value per Article 8(1)(d).