Under the declaration, the 47 countries have committed to "swiftly" pass new domestic laws that will allow them to collect information on all bank accounts and automatically exchange it with other participating countries.
They must also call on their financial centres "to implement the new single global standard without delay".
The list of signatories includes all 34 members of the Organisation for Economic Co-operation and Development (OECD), a club of developed nations that spearheaded the initiative.
The list also includes Luxembourg, even though it is blocking transparency initiatives within the European Union.
The OECD has also secured the participation of 18 non-OECD nations, including the key international financial centre of Singapore.
The new global standard was described as "a real game-changer" by OECD chief Angel Gurria when it was unveiled in February.
Previously, countries would have to request data on suspected tax cheats using a process that was often complicated and some countries were uncooperative.
The next step, the new declaration states, is for the OECD's fiscal committee to provide within the coming months clear guidelines on how the standard should be put into practice, and come up with technical solutions to make sure it is effective.
A "Global Forum" is also due to be set up to monitor and evaluate individual countries' efforts.
Developed in cooperation with the Group of 20 gathering of advanced and leading emerging markets, the system should come into force in 2015.
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