1. Insurance and reinsurance undertakings may, subject to prior approval by their supervisory authority, apply a transitional adjustment to the relevant risk-free interest rate term structure with respect to admissible insurance and reinsurance obligations.

2. For each currency the adjustment shall be calculated as a portion of the difference between:

(a) the interest rate as determined by the insurance or reinsurance undertaking in accordance with the laws, regulations and administrative provisions which are adopted pursuant to Article 20 of Directive 2002/83/EC at the last date of the application of that Directive;

(b) the annual effective rate, calculated as the single discount rate that, where applied to the cash flows of the portfolio of admissible insurance and reinsurance obligations, results in a value that is equal to the value of the best estimate of the portfolio of admissible insurance and reinsurance obligations where the time value of money is taken into account using the relevant risk-free interest rate term structure referred to in Article 77(2).