What rules are in force?
Every publisher has its own rules for parallel publishing. The rules can also vary from journal to journal, even with the same publisher.
The publisher’s general policy on parallel publishing can be found at SHERPA/RoMEO. The journals have color codes, which gives information about the options for parallel publishing. The register is not exhaustive. If you do not find information about the journal you are looking for, make contact with the journal/publisher directly.
Check your publishing agreement
If your publisher allows parallel publishing, you should find the conditions in the agreement between you and the publisher.
What version of the publication may be parallel published?
Most commonly the post-print version of a publication can be parallel published. This is the final manuscript following peer review. Some publishers only allow pre-print versions. The publisher’s PDF version can occasionally be published in the institutional repository, but this is uncommon.
When can you parallel publish?
This varies from journal to journal. The publishers often have an embargo of 6-24 months before you can parallel publish. Information on this should be in the agreement between you and the publisher.
Where can you parallel publish your publication?
The publishers’ rules for parallel publishing apply when publishing in your employer’s institutional repository, such as USN Open Archive.