In the Philippines, the 13th month pay is a mandatory benefit provided to employees and is based on the total basic salary earned within a calendar year. It is typically calculated by dividing the total basic salary earned by 12 months.
If you start your employment in January and work until June within the same calendar year, you would be entitled to receive a proportional 13th month pay based on the number of months you have worked. In this case, you would be eligible to receive half of the 13th month pay, as you have completed six months of service within the calendar year.