What is Subsídio de Natal?
The subsídio de Natal (Christmas subsidy) is equal to one month of pay and must be paid by December 15. It is often called the '13th month'.
In the year of hiring or termination it is counted proportionally to the months worked. It can be paid in full or in duodécimos.
In practice
Someone earning €1,500 receives, by December 15, another €1,500 of Christmas subsidy; if they joined mid-year, they receive the proportional part.