The Catalans secured the services of the Brazil international in a deal worth €57m [£49m], but Santos obtained only €9.35m [£8m] of the fee.
|4/6||Neymar is 4/6 with William Hill to score on his La Liga debut
Santos could earn an extra €2m, though, if the 21-year-old enjoys success at the highest level and makes it onto the podium of the Ballon d'Or between now and 2017.
Neymar had to settle for 13th spot in the 2012 Fifa Ballon d'Or election, while finishing 10th in the 2011 vote.
He will be hopeful of doing better in 2013, though, after earning a transfer to Barcelona and guiding Brazil to Confederations Cup glory this summer.
Barca team-mate Lionel Messi has won the inaugural three editions of the Fifa Ballon d'Or and scooped the World Player of the Year accolade in 2009.