Treasury secretary-general and 1Malaysia Development Bhd (1MDB) board member Mohd Irwan Serigar Abdullah has refused to confirm if the company will fulfil payment obligations to Abu Dhabi's International Petroleum Investment Company (IPIC) by tomorrow.

"You wait and see," Irwan told reporters curtly today, before leaving a function in Putrajaya.

1MDB, a sovereign wealth fund wholly-owned by the Finance Ministry, had missed a July 31 deadline to pay IPIC US$602 million (RM2.57 billion).

Following this, Ipic granted an extension, which led to 1MDB making a partial payment of US$350 million (RM1.49 billion) on Aug 12 and an understanding that the balance would have to be paid by Aug 31.

In 2015, IPIC helped pay 1MDB's debt of US$975 million (RM3.57 billion at the time) to an international banking consortium.

Ipic also stood as a guarantor for some of 1MDB's debt.

Following this, there was a dispute between the two companies over certain debt obligations and the matter was supposed to be brought for arbitration.

Eventually, Putrajaya managed to reach a settlement with IPIC, which would see at least US$1.2 billion being paid by Dec 31.

Read our KiniGuide: 1MDB's debt payment plan and how it doesn't add up