Chris Luxon is adamant his tax cuts will be delivered as promised, when promised.

A coalition deal's now been signed and Luxon becomes the Prime Minister on Monday.

National's promised plan for tax cuts now has a hole of 740-million-dollars a year, after New Zealand First vetoed a foreign buyers' tax.

Luxon told Heather du Plessis Allan that 100-million dollars will be raised by changing fees free to the final year of university.

He says a series of other things will add up, like repealing the app tax and not progressing the 2026 changes to Working for Families.

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