18 teams, each plays the others twice - home and away - for a total of 34 games each, over 34 game weeks.
3 points for a win, 1 point for a draw, 0 points for a loss.
1. points won; 2. points in head-to-head matches; 3. goal difference in hth matches; 4. away goals in hth matches; 5. total goal difference; 6. games won; 7. total goals scored; 8. play-off.
Qualification for UEFA competitions:
1 place: UEFA Champions League Group stage
2 place: UEFA Champions League Qualifiers
3-4 place: UEFA Europa League Qualifiers
5 place: possible UEFA Europa League Qualifiers (depends on Taça de Portugal outcome)
Relegation from the league:
17-18 place: relegated to Segunda Liga
Promotion to the league:
2 teams from Segunda Liga