According to the Single Text of Administrative Procedures (TUPA) of INDECOPI (the Supreme Decree 085-2010-PCM of August 19, 2010) says that the annuities must be paid from and during the application process and are counted from the first filing date. In Peru The deadline for pay each annual fee is the date of the presentation.
In case of a patent applications enters in a National Phase according to the Patent Cooperation Treaty (PCT), for the payment of annuities it will be taken into account the date of International filing of the PCT application. In this case, the payment will make in the date of the day presentation of the national phase for the current year, but taking as reference the international filing date.
There is a grace period of six months after the starting date of the corresponding annual period, but you must to pay an overcharge. The patent shall remain in full force during the grace period.