Everyone is requested to declare online,
only people not in the capacity to do it (not having internet connexion, or not able to do it can declare on paper).
The starting period is April 20th, 2020 for everyone
The end period depends where you live
- In the departments 01 to 19 or you are a non resident : Thursday June 4th, 2020
- In the departments 20 to 54 : Monday June 8th, 2020
- In the departments 55 to 976 : Thursday June 11th, 2020
NB : What will be declared : income and expenses from 2019.
Some items are pre-filled. It is your responsibility to check that they are correct, if not to adjust them.
Maybe you have some income to add, or expenses to communicate, like child care, housekeeper, donations to associations.
Link to the government website