The amount of the opposition fee specified in the Rules relating to Fees under the EPC must be paid before expiry of the time limit for opposition.
An opposition filed in common by two or more persons, which otherwise meets the requirements of Art. 99 and Rules 3 and Rule 76, is admissible on payment of only one opposition fee (see G 3/99).
As regards the legal consequences and the procedure where the fee is not paid in good time, see D-IV, 1.2.1(i), and D-IV, 1.4.1.
For reduction of the opposition fee, see A-X, 9.2.4.