We have extensive experience in conducting VAT investigations at institutions and companies, in particular also at institutions and companies that cannot deduct all VAT as input tax. For these “mixed” companies, the calculation (and checking) of the integration tax with regard to immovable property and revision of VAT on movable and immovable property is also an important fiscal aspect. We have developed our own methodology for this from DHK to report the calculations efficiently and in a verifiable manner to the customer and the Tax Authorities, as a basis for the refund of pro rata VAT.