20 teams, each plays the others twice - home and away - for a total of 38 games each, over 38 game weeks.
3 points for a win, 1 point for a draw, 0 points for a loss.
1. points won; 2. games won; 3. total goal difference; 4. total goals scored; 5.* points in head-to-head matches; 6.* goal difference in hth matches; 7.* away goals in hth matches; 8. play-off (only for deciding the champion and relegation); 9. lesser number of red cards received; 10. lesser number of yellow cards received; 11. draw.
* - only applicable if exactly two teams are tied.
Qualification for CONMEBOL competitions:
1-6 place: Copa Libertadores
7-12 place: Copa Sudamericana
Relegation from the league:
17-20 place: relegated to Serie B
Promotion to the league:
4 teams from Serie B