If you want to make a suggestion or consultation concerning the content or working of the Central Online Office, go to the following mail address: gestion.sede@hacienda.gob.es (contents manager mailbox of the Central Online Office, webmaster).
If you want to make a formal complaint or suggestion, you should opt for filing it by way of the Complaints and General Suggestions to this Ministry, as specified in Article 15 of Royal Decree 951/2005, of 29 July, regulating the general framework for the improvement of quality in the General Administration of the State.
