IT'S official. Prime Minister Tony Abbot has been commissioned by the Governor-General Quentin Bryce at Government House.

As his wife Margie, three daughters and parents watched on, Mr Abbott took an oath on the Bible and signed official papers to assume office.

"I, Anthony John Abbott, do swear that I will well and truly serve the people of Australia," he pledged.

Nationals leader Warren Truss has been sworn in as Deputy Prime Minister, and will also take on the portfolio of infrastructure and regional development.

The 42 ministers, assistant ministers, and parliamentary secretaries are each being sworn in this morning, 10 days after they were elected to government.

The ABC reports that many of the new ministers arrived at Government House with their families, including some very young children.

The new Agriculture Minister, Barnaby Joyce, arrived in a taxi with his family, after he quit the Senate to reclaim the Lower House seat of New England for the Nationals.

The Prime Minister's chief of staff, Peta Credlin, and her husband Brian Loughnane, who is the Liberal Party's federal director also attended the ceremony.

Mr Abbott intends to immediately instruct the Department of the Prime Minister and Cabinet to prepare legislation to repeal the carbon tax.