earn out

verb2

1. •
   To qualify for a bonus or other amount of money that has been promised.
2. •
   To make more money from a book than it cost to run an advertising campaign for it; to make enough in royalties to cover the advance a book received.

   • Until the total of advances in that contract has been earned out by royalties from any or all books in that contract, the author will not receive additional royalties. — 2014