In Colombia the annuities must be paid in advanced from the grant date. During examination is not required to pay for annuities as they are considered to be included in the filing fee.
Once the patent is granted annuities are counted from the presentation date in Colombia or the international filing if it is the case.
The deadline for pay each annual fee is the last day of the month of the presentation in Colombia or the international filing if it is the case.
There is the grace period of six months.