If the taxable person also uses goods, parts thereof or services outside their business activity, or uses the same within their business activity both for supplies entitling the taxable person to make an input tax deduction and for supplies that are excluded from input tax deduction, the taxable person must correct the input tax deduction in proportion to their use.
If such a pre-supply is predominantly used in the course of the business activity involving supplies entitling the taxable person to make an input tax deduction, the input tax may be deducted in full and corrected at the end of the tax period (Art. 31).