With Plan S, which will be implemented by the FWF from 1 January 2021, new Open Access guidelines will come into force for project participants. The new policy should accelerate the transition to a complete and immediate open access.

The new Plan S-aligned FWF Open Access Policy applies for all FWF research projects that are approved as of 1 January 2021. The peer-reviewed scholarly articles resulting from these projects must be published open access without delay. (For other publication formats such as monographs and edited volumes, a binding guideline will be developed as part of cOAlition S in the next few years.)

Three open access publication options are available to researchers:

1. Publication in an open access journal/platform (Gold OA)
2. Archiving of the accepted manuscript in a freely accessible repository under a CC BY licence without an embargo (Green OA). It should be noted here that a CC BY licence must be applied to the accepted manuscript in the acknowledgement already at the time when the manuscript is submitted to the publisher. For more information on this, see the Rights Retention Strategy and the text that needs to be included according to the FWF OA Policy.  
3. Publication in a subscription journal, provided that a transformative open access agreement exists between the research institutions or funding agency and the publisher, or the journal is a transformative open access journal (Hybrid Open Access)

Details and additional information:

FWF: New Open Access Guidelines Starting in 2021
FWF Open Access policy for peer-reviewed publications
Journal Checker Tool for Plan S / FWF compliance
Plan S: Making full and immediate Open Access a reality