REACH requires existing registrants and potential registrants to make every effort to reach an agreement on sharing data. The legislation also requires that the costs of sharing the information for a registration are determined in a fair, transparent and non-discriminatory way.

If your substance is already registered, you need to contact the lead registrant to become a member of the joint submission after agreeing on data and cost sharing. Read more in the section ‘Joining an existing joint submission’.

If no registration yet exists for your substance, you first have to agree with the other inquirers – if there are any – how to organise your joint submission. Read more in the section ‘Creating a new joint submission’.

For further information, you can also consult the Guidance on data sharing.