ISLAMIST party PAS has said it is crucial that the rationalisation plan for troubled 1Malaysia Development Bhd (1MDB) succeeds as failure to fully repay its debts will cost the country an extra US$1.9 billion (RM8.1 billion) annually in interest.

The state investment fund missed a debt payment deadline on July 31 for more than US$600 million to Abu Dhabi’s government-owned International Petroleum Investment Co (IPIC).