[4] Neto was born in Salvador to Antônio Carlos Magalhães Júnior, son of ACM, the former governor of Bahia.

He is also the nephew of Luís Eduardo Magalhães [pt] and great grandson of Francisco Peixoto de Magalhães Neto [pt] He is a Lebanese descendant by his grandmother Arlette Maron, her family being one of the first Lebanese families to establish themselves in the south of Bahia, more precisely in the city of Itabuna.

Graduated in Law by the Federal University of Bahia, ACM Neto was involved in politics from a very young age, even being First Vice President of the student body of Colégio Módulo, where he concluded high school.

In this period, he was sought out by the media because of his participation in the Inquiry Mixed Parliamentary Committee (CPMI) of the Correios.

He said to the column Painel of the Brazilian newspaper Folha de São Paulo that "[he] thought the press wanted to shut down the Congress" and that he could have used airline tickets bought with the Chamber funds to travel with his wife to Paris.

[11] In 2018, he became the national president of the Democrats (DEM) political party, substituting José Agripino Maia.

[3] DEM, PR, PRB, PRP, PSDC, PTdoB, PTC, and PTN DEM, PV, PSDB, PR, PSDC, PPS, and PTN DEM, MDB, PSDB, PV, PMB, PEN, PHS, PPS, PRB, PSC, PTdoB, PSDC, PTB, SD, and PTC UNIÃO, REP, PP, Fed.