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Gratuity is calculated on the basis of the last basic remuneration you receive from the company
You can file a complaint at the Labor Office if you do not receive this remuneration in accordance with the law.

 

Article 132
 A worker who has completed one or more years of continuous service shall be entitled to severance pay at the end of his employment. The days of absence from work without pay shall not be included in calculating the period of service. The severance pay shall be calculated as follows: 1. 21 days' wage for each of the first five years of service. 2. 30 days’ wage for each additional year of service provided always that the aggregate amount of severance pay should not exceed two year's wage.