GA C I 5 Choice of ISA and consequences

202
If the receiving Office has specified more than one ISA, the applicant must indicate his choice of ISA in the PCT request (Box No. VII) and in the Fee Calculation Sheet (Box No. 2) (see Annex VII). Only one ISA may be selected. For example, the EPO may be chosen as ISA for applications filed with the USPTO and for applications in English filed with the JPO as receiving Office.
Agreement EPO-WIPO, Art. 3(2), Annex A(ii) 
203
Applicants considering their choice of ISA are advised to bear in mind that the EPO will act as an IPEA only if the international search was carried out by the EPO itself or by another European ISA. On 1 January 2018, the EPO, the Austrian, Finnish, Spanish, Swedish and Turkish patent offices as well as the Nordic Patent Institute and the Visegrad Patent Institute were acting as European ISAs (see point 311).
204
If the EPO acts as ISA or SISA, no supplementary European search is carried out. Therefore, no search fee will be due on entry into the European phase (see point 583).
OJ 2009, 594
205
If the EPO acts as IPEA, there is a reduction of 50% of the examination fee in the European phase (see point 607).

10 references found.

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EPC Rules relating to Fees

EPO Guide for Applicants, part II Int.

EPO Guide for Applicants, part II Int. - A General Overview

EPO Guide for Applicants, part II Int. - C The EPO as ISA and SISA

EPO Guide for Applicants, part II Int. - D The EPO as an IPEA

EPO Guide for Applicants, part II Int. - E Euro-PCT procedure before the EPO as designated or elected Office

PCT Implementing Rules

Offical Journal of the EPO