Benfica were the previous holders, having defeated Porto 2–1 in the previous season's final.[2] Vitória de Setúbal defeated holders Benfica, 2–1 in the final to win their third Taça de Portugal.[3]
Vitória by winning the Taça de Portugal, qualified for the 2005–06 UEFA Cup first round.[4] Vitória de Setúbal would also qualify for the 2005 Supertaça Cândido de Oliveira.[5]
1. ^1 One hundred and six of the one hundred and eight teams competing in the 2004–05 Terceira Divisão, played in this round. Benfica B were unable to compete in the domestic cup competition due to the possibility of encountering their senior side in the competition. Queluz also did not participate.
2. ^2 Fifty six of the fifty nine teams competing in the 2004–05 Segunda Divisão, played in this round. Braga B, Marítimo B and Porto B were unable to compete in the domestic cup competition due to the possibility of encountering their senior side in the competition.
For the first round draw, teams were drawn against each other in accordance to their geographical location. The draw was split up into four sections: teams from the north, the center, the south and the Azores region.[6] All first round cup ties were played on the 5–15 September.[7][8] Due to the odd number of teams at this stage of the competition, Angrense progressed to the next round due to having no opponent to face at this stage of the competition. The first round of the cup saw teams from the Terceira Divisão (IV) start the competition alongside some teams who registered to participate in the cup from the Portuguese District Leagues (V).
Ties were played between the 19 September and 5 October.[9][10] The second round saw teams from the Portuguese Second Division (III) enter the competition.
The draw for the third round took place on the 24 September.[11] Ties were played on the 5–13 October.[12][13] Due to the odd number of teams at this stage of the competition, Marco progressed to the next round due to having no opponent to face at this stage of the competition. The third round saw teams from the Liga de Honra (II) enter the competition.
The draw for the fourth round took place on the 11 October.[14] All fourth round cup ties were played on the 26–27 October.[15][16] Due to the odd number of teams at this stage of the competition, Belenenses progressed to the next round due to having no opponent to face at this stage of the competition. The fourth round saw teams from the Primeira Liga (I) enter the competition.
Ties were played on the 25–26 January.[20][21] Due to the odd number of participants involved in the 2004–05 Taça de Portugal, Beira-Mar qualified for the quarter-finals due to having no opponent to face at this stage of the competition.[22]