Nicola Willis says saving taxpayers' money isn't her party's primary motivation for a plan to index benefits to inflation.

She recommitted to the pledge in National's fiscal policy today, which promises less Government spending and less debt.

Willis told Heather du Plessis-Allan the benefit moves are a point of principal for National.

“That what we owe all New Zealanders is a social safety net – that’s what benefits are there for.”

LISTEN ABOVE