The centre-right governing coalition has vowed to continue austerity policies in place since 2011, after it was forced to seek a eurozone bailout.
The Socialists and other left-wing groups have criticized the cuts.
President Anibal Cavaco Silva called for a high turnout on October 4, saying Portugal was facing a crucial moment.
Years of austerity have left Portugal’s electorate deeply split, and with an unusually large number of undecided voters.
Socialist leader Antonio Costa has said that only a vote for his party is a “useful vote” against the government.
The centre-right Social Democratic Party led by PM Pedro Passos Coelho and its right-wing ally, the People’s Party have put up joint lists of candidates in all electoral districts.
Portugal’s unemployment has been falling for two and a half years, but many regard the recovery as fragile.
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