The daily wage of Workers who receive their wages on piece-meal basis is calculated according to the average of what the Worker received for the actual working days during the six (6) months preceding the request or the lawsuit regarding any matter related to the wage.
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UAE Labour Law (Decree-Law 33/2021)
Article 23: Method of Calculating Wages for Workers on Piecemeal Basis
Official English translation from the UAE Legislation portal. For interpretation and application, the original Arabic text prevails.