CBEC has notified rate of exchange applicable from 18th January 2013 as per section 67A of the finance act 1994 read with explanation to Section 14 of the Customs Act 1962, rate of exchange for calculation of gross value of taxable service tax would be the rate as determined by CBEC for the conversion of foreign currency into Indian currency or vice versa applicable on the date on which taxable service has been provided or agreed to be provided. (For Annexure email us).