The 34-year-old Swede, who joined the club in 2012 from AC Milan and has scored 127 goals in 156 games since then, now gets €1.5 million a month before tax under the performance-based hike agreed late last year.
On top of that, Ibrahimovic can pocket three big bonus payments for winning the French league title and ending the season with the top combined total of goals scored and goal assists.
With PSG currently 21 points clear of second-placed Monaco in the league, the first of those targets is all but certain. Paris go up against Chelsea in the last 16 of the Champions League next month.
French newspaper Le Parisien, which broke the story, added however that there was no word on whether Ibrahimovic would stay in Paris after his current contract expires at the end of the season.
He is on record as saying he has no intention of leaving, claiming he has "a beautiful relationship with PSG".
Ibrahimovic will also be playing in France during the summer as Sweden contest the Euro 2016 finals.
Asked in December if he would extend his international career beyond next summer, Ibrahimovic said: "When it comes to the national team, I have the Europeans. I am happy we have reached the European Championships and I will be playing and I will enjoy it."
"What happens after, I don't know. If I will be playing the qualification for Russia, I don't know. That is too far, too soon to answer."
Sweden has been drawn in a tough group for Euro 2016 in France in June next year, comprised of Italy, Belgium and the Republic of Ireland.