In the past years banks and companies give tax related information to the tax authority so for lots of people the online tax form is already 100% filled and correct.
For the past year tax filling I just had to add to the web form renting income, tax deducible donations, and that was it.
https://fr.wikipedia.org/wiki/T%C3%A9l%C3%A9d%C3%A9claration...
In the past years banks and companies give tax related information to the tax authority so for lots of people the online tax form is already 100% filled and correct.
For the past year tax filling I just had to add to the web form renting income, tax deducible donations, and that was it.