A draft Inland Revenue briefing supports lifting the GST rate if required - and notes tax credits could help people on lower incomes.
The IRD briefing also brought up the lack of a capital gains tax, but did not endorse any specific view on it.
Tax expert Geof Nightingale told Heather du Plessis-Allan that lifting GST is a fast and efficient way to raise revenue.
But he says while quick, it's much harder on lower-income people.

Enda Brady: UK correspondent on King Charles' planned visit to the US
03:27

Sam Dickie: Fisher Funds expert on the US Federal Reserve raising inflation outlook over 'uncertain' Iran war impact
03:45

The Huddle: Do we need to give Originair more funding?
07:13