There are also proprietary databases that are developed and maintained by some advisory firms. In addition to the issues raised above for commercial databases that are more broadly commercialised, proprietary databases also raise a further concern with respect to their coverage of data if they are based on a more limited portion of the market than commercial databases. When a taxpayer has used a proprietary database to support its transfer prices, the tax administration may request access to the database to review the taxpayer’s results, for obvious transparency reasons ...

There are also proprietary databases that are developed and maintained by some advisory firms. In addition to the issues raised above for commercial databases that are more broadly commercialised, proprietary databases also raise a further concern with respect to their coverage of data if they are based on a more limited portion of the market than commercial databases. When a taxpayer has used a proprietary database to support its transfer prices, the tax administration may request access to the database to review the taxpayer’s results, for obvious transparency reasons ...