The OECD has responded favourably to requests from Chile, Estonia, Israel, Russia, and Slovenia to join the OECD. Input is being sought from business and NGOs in the process of assessing how far the applicant countries meet the core principles.

The core principles are listed as:

• eliminating international double taxation on income and capital through complying with the key substantive conditions underlying the OECD Model Tax Convention;
• eliminating double taxation through ensuring the primacy of the arm's length principle, as set forth in the OECD's Transfer Pricing Guidelines for Multinational Enterprises and Tax Administrations, for the determination of transfer pricing between associated enterprises;
• engaging in effective exchange of information according to the 2005 version of Article 26 of the OECD Model Convention;
• combating harmful tax practices in accordance with the 1998 Council Recommendation and related reports;
• eliminating double and unintentional non-taxation through the development and implementation of International VAT/GST Guidelines designed to encourage greater coherence and clarity when applying consumption taxes to international transactions.