Your form is the 840, approved by paragraph One of Order HAC/2572/2003. Its reference number begins with code 890.
If a relief granted on application is due to you, article 9.1 requires it to be requested «when filing the registration return». The body that grants or refuses it is your town hall.
The deadline for each return is in articles 5, 6 and 7 of the regulation, and our IAE calculator resolves it, including the year you start paying.
Adjustments: zero quota, heading 508 and group
The four routes: delegation changes the form only on the municipal quota.