The government is planning to host the singing of the Trans-Pacific Partnership in Auckland on the 4th of February.

Ministers from the 12 participating countries have been invited to sign the trade deal in New Zealand, ending lengthy negotiations.

Opposition to the agreement remains strong and public demonstrations are being planned throughout the country.

Once the trade partnership's been signed, it must be ratified in each relevant parliament within two years.

Only then will the deal come into force.

It's expected to save New Zealand about $260m in trade tariffs each year.