Notification-Classification and Labelling Inventory

For substances with REACH registration deadlines in 2018, is it necessary to notify a substance to the C&L Inventory before the registration deadline?

Yes, it is. Notification is independent from the REACH registration deadlines. A substance, either on its own or contained in a mixture, must be notified to the C&L Inventory within one month of the first time the company is placing it on the market. Notification can be done using any of the notification tools available at: http://echa.europa.eu/support/dossier-submission-tools/reach-it/notification-to-the-cl-inventory