It is not mandatory, you can take vacation whenever you want to (as long as it's granted of course). Another interesting fact about Swedish law is that you are

It is not mandatory, you can take vacation whenever you want to (as long as it's granted of course). Another interesting fact about Swedish law is that you are free to leave your job for further education if you want. Max 6 months and when you come back, the employers is required by law that you recieve the same sort of job tasks and the same amount of pay of course. The employer has the right to decide when you may leave for max 6 months ahead in the future.