According to BBC Sport, the Brazil international's salary will total €45 million a year before tax.
Barca have told PSG they will have to meet Neymar's €222m release clause, which the Parisians are understood to be ready to do.
PSG will therefore fork out €446m across the initial five-year deal for the 25-year-old.
Neymar arrived at training on Wednesday with his father and representative and told the Catalans he wants to leave. Barca manager Ernesto Valverde gave him permission not to train and to "sort out his future".
Manchester United midfielder Paul Pogba is currently the most expensive footballer, having cost €105m when he returned to Old Trafford from Juventus in August 2016.