I want to take advantage of the tax relief in advance and I will fill out the form in September. Do I have to file a second declaration in December for the rest of the tax relief?

If there is no change in the circumstances you declared in September, you do not need to file a second declaration at the end of the year. The employer will pay the rest of the tax relief for the year with the December salary automatically.

If there is a change in the circumstances declared in September (for example – a child was born, a divorce, etc.), then you must fill out the form again and declare the current data. The system will recognize the new declaration and after processing it will be attached to your e-labour file if you use it.