Maintenance fees are payable from the date of filing, however, fees are not due during the pending period of the application. Fist maintenance fees are payable upon granting. Fees are payable in five years increments to a maximum of 20 years (10 years in the case of utility models) from the date of application. It is not acceptable to paid maintenance fees yearly.

Patent annuities for the first up to the fifth year should be paid upon grant. The remaining patent annuities are payable in advance by three instalments (by one instalment in the case of utility model patents), each instalment covers a period of five years . Six-month grace period is allowed provided a surcharge is paid. A further six month period is given provided the surcharge and a fee for restoration of the patent rights is paid.

The maintenance fees in connection to industrial model patents can be paid yearly or in several instalments.

The documents and information needed for carrying out the payment of annuities are the following:

- Particulars of the owner.
- Patent number.
- Application date.
- POA (in case the representative person is not the agent of record).

The POA does not required legalization but it must be executed by the power grantor and by two witnesses, mentioning their names and domiciles. If the applicant is a company it must be indicated the Corporation Resolution, its date and place of execution whereby the signer was given authority to grant Powers of Attorney. The original POA may be filed latter provided a surcharge is paid.