What is a share split?
A share split explains how the royalties will be distributed between all interested parties. As an example, imagine a work has two writers, A and B, and is published by C. PRS and MCPS will assume, unless otherwise advised, that A and B have agreed to share the royalties equally, giving them 25 percent each and C, the remaining 50 percent.
When you register a work with us, you add your agreed share for performance if you're a PRS member, and mechanical royalties if you're a member of MCPS. Your co-writer will then add their share. So if this work was to be registered today, both A and B would need to register the song individually and add their 25 percent at the point of registration.