The Finance Minister denies dishing out tax cuts risks will keep interest rates high for longer

Long-promised tax changes begin on Wednesday - giving an average household 60-dollars a fortnight for - and those with children 78 a fortnight.

The Reserve Bank says positive impact of tax cuts on private spending are uncertain - as it maintains its ongoing battle with inflation.

Minister Nicola Willis says she's had consistent Treasury advice the Government cuts aren't inflationary.

She says the dollars will go to New Zealanders, which many will spend - but some dollars with be saved, and used to pay down debt.