Australia stands to gain almost nothing from the mega trade deal sealed with 11 other nations including United States, Japan, and Singapore, the first comprehensive economic analysis finds.

Prepared by staff from the World Bank, the study says the so-called Trans-Pacific Partnership would boost Australia's economy by just 0.7 per cent by the year 2030.

The annual boost to growth would be less than one half of one 10th of 1 per cent.

Other members of the TPP stand to benefit much more, according to the analysis. Vietnam's economy would be 10 per cent bigger by 2030, Malaysia's 8 per cent bigger, New Zealand's 3 per cent bigger, and Singapore's 3 per cent bigger.