An important outcome of such a coordinated effort is multilateral/bilateral tax information exchange agreements like the proposed Automatic Exchange of Information (AEOI) initiated by the G20 along with OECD.
What is automatic information exchange?
Automatic exchange of information involves the systematic and periodic transmission of “bulk” taxpayer information by the source country to the residence country concerning various categories of income (e.g. dividends, interest, etc.). It can provide timely information on non-compliance where tax has been evaded.