Leaked minutes show that commission and third-party ownership dramatically reduced amount that the Brazilian club profited from the departure of their superstar to Camp Nou
The 21-year-old, who starred in Brazil's successful Confederations Cup campaign in June, joined the Catalans for €57m (£49.2m) in one of the highest-profile transfers of 2013 to date. The total outlay has been confirmed by Barca.
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According to the documents, Barca paid €17.1m (£14.8m) for the full ownership of Neymar, though just €9.35m (£8.1m) went to the Brasileirao club, with two companies that owned part in his registration - Teisa Group and DIS - splitting the other 45 per cent.
The report also claims that the remaining €40m (£34.6m) was paid in commission to other parties, including Neymar's father, as the Camp Nou club fought off competion from rivals such as Real Madrid, Chelsea and Manchester City.
Santos may receive more financial profit from the move eventually through arranged friendlies to which the two sides agreed, with the first on August 2 in Spain, and potential objectives for the forward to achieve which were included in the contract.
The documents also show that Neymar’s father wanted his son to depart Brazil ahead of the World Cup because he did not want him to become a "hero or villain" at next summer's tournament in the South American country.
The attacker, who has scored an impressive 24 goals in 39 Selecao appearances, will meet up with his new Barca team-mates later in July.