KEY POINTS:
United Future leader Peter Dunne will be Minister of Revenue and Associate Minister of Health in the new National-led government.
Click here for the full agreement
The agreement was the third and last announced by incoming prime minister John Key today as he finalised the formation of his administration.
Mr Dunne, his party's only MP, adds a single confidence and supply vote to those gathered from ACT and the Maori Party, making a total of 70 in the 122-member Parliament.
It was the most simple of the three agreements.
Mr Dunne is already Minister of Revenue under Labour and will continue in that role under National.
He is an associate health minister so he can continue his work on a medicines strategy, which he began under Labour.
In return for his support National has agreed to keep the Families Commission - which Mr Dunne set up as part of his support agreement with Labour - although "administrative efficiencies" will be sought between the commission and the Office of the Children's Commissioner.
Mr Dunne said the advocacy of the Families Commissioner would not be affected.
National has agreed to support a bill through its first reading on income splitting, although not beyond that.
Income splitting is a United Future policy and involves a single income family being able to split its income between spouses so less tax is paid.
It is estimated to cost about $400 million a year.
Mr Key said National had "some concerns about whether it would work across the board".
National has also agreed to establish a Big Game Hunting Council as part of a national wild game management strategy.
Mr Dunne will be a minister outside cabinet.
- NZPA