First Stage
24 clubs are divided in two series (Serie A and Serie B) of 12 teams each. Teams play against each other in a home-and-away double round-robin system. The top four best-placed teams of the two series will advance to the promotion series and bottom 8 teams will proceed to the relegation series.
Promotion Stage
The eight qualified teams will be divided in two series of 4 teams, playing against each other in a home-and-away double round-robin system. The winners of each series will be automatically promoted to Liga Portugal 2 and will face each other in a neutral venue to determine the champion. The second best placed teams will face each other in a playoff, whose winner will face the 16th placed of Liga Portugal 2 for the last spot in Liga Portugal 2.
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