He left Gindiri in 1967 and joined the Nigerian Tobacco Company, Zaria the following year as a quality controller.
He moved to BEAM, a division of UAC Nigeria as a Kalamazoo specialist salesman in 1971.
In 1993, he became Director General of the National Republican Convention Presidential Campaign Organisation.
A year later, Ibrahim Mantu was re-elected as senator representing Plateau Central senatorial district on the platform of the Peoples Democratic Party.
[6] He was laid to rest on 17 August 2021 at the Sheikh Khalid Mosque in Abuja.