Then the company is guaranteeing an accelerated resignation / sickness rate. Bring it on. Most of the pilots I am flying with are actively looking to leave. This will only magnify that trend. Most of the pilots can barely afford to live on the income they have as it is, never mind doing without the 13th month. I know of many pilot's who can't afford to support their families (school fees, debentures, school trips, medical, travel to their home countries, etc). Don't pay the 13th month and see just what you reap regarding your operation.