A few reasons come to mind
It is one of the most comprehensive official documents that addresses the transfer pricing principles in detailed which are applied
- Most tax authorities worldwide (OECD and Non-OECD countries) refer to it when a dispute event happen with tax payers
- Most courts worldwide also refer to the OECD Guidelines as reference to apply transfer pricing principles
Majority of local transfer pricing guidelines around the world (OECD and NON OECD countries) adopt the transfer pricing principles of
the OECD TP Guidelines.
The most recent update of the OECD Transfer Pricing Guidelines was issued in January 2022. The new update incorporates key chapters
released by the OECD as part of BEPS Action Plan that commence in 2013. The incorporation of these chapters with key topics of transfer
pricing was long overdue.