Voting for BN in the coming Permatang Pauh by-election means supporting the implementation of the goods and services tax by the federal government, Chief Minister Lim Guan Eng said today.

"This choice has to be made by the people - a vote for Umno is a vote for BN and a vote for GST and 1MDB," Lim said after a press conference today to announce the 50 year anniversary celebrations of the Penang Museum.