The US Treasury said that "due to overwhelming interest from countries around the world," it would extend the deadline for compliance with the US Foreign Account Tax Compliance Act (FATCA) by six months to July 1, 2014.
On that date foreign banks and other financial institutions will have to have agreed to identify and report information on US account holders, or the Treasury will require US financial institutions to hold back 30 percent of dividend and interest payments due to them.
The Treasury said it was working with more than 80 countries and jurisdictions to begin exchanging data on the offshore accounts of their respective foreign nationals, amid a global effort to police tax evasion.
"The high volume of international participation in this effort represents a quintessential race to the top," said Robert Stack, the Treasury's deputy assistant secretary for international tax affairs.
"Every additional country we bring on board means we are one step closer to winning the fight against offshore tax evasion," he said in a statement.