Mahama served as the Deputy Minister of Communications between April 1997 and November 1998. During his tenure as Minister for Communications, Mahama also served as the Chairman of the National Communications Authority, in which capacity he played a key role in stabilising Ghana's telecommunications sector after it was deregulated in 1997. As a minister, he was a founding member of the Ghana AIDS Commission, a member of the implementation committee of the 2000 National Population Census and a deputy chairman of the Publicity Committee for the re-introduction of the Value Added Tax (VAT).