(21)Capital requirements for interest rate risk under the standard formula are calculated separately for each currency. However, for insurance and reinsurance undertakings the head office of which is in a Member State whose local currency is pegged to the euro, that approach results in disproportionately high capital requirements that do not reflect the actual economic risks. It is therefore necessary to lay down that capital requirement for interest rate risk under the standard formula may be calculated jointly for the euro and the pegged currency of the Member state in which insurance or reinsurance undertakings have their head office.