The introduction of new US tax evasion laws is being held up by the failure to reach agreements with other countries, warns one expert.

The Foreign Accounts Tax Compliance Act, or Fatca, was due to be introduced from next year but, according to a notice published on the IRS website on Wednesday, the deadlines have been pushed back. The original 2013 deadline for financial institutions to put compliance procedures in place has been delayed until January 2014.