The opposition in Vanuatu's parliament has lodged a motion of no confidence in the prime minister Charlot Salwai.
The opposition has listed six reasons for the motion, including concerns over corruption, ministerial "incompetence", decentralisation and tax.
The list also includes "tolerance of outstanding revenue totalling over Vt4 billion ($US36.1 million)" and the signing of the PACER Plus trade agreement.
The opposition bloc said it was concerned at the failure of the government to implement a decentralisation policy which was supported by a majority of MPs and at the proposed introduction of income tax.
The government has not commented on the motion which has been lodged with the Speaker.
Last month Vanuatu's opposition leader Ishmael Kalsakau accused the Speaker, Esmon Simon, of bias in his decision to reject a no confidence motion in the deputy prime minister, Joe Natuman.