Chris Hipkins insists Labour will only introduce a capital gains tax. Photo / NZMEChris Hipkins insists Labour will only introduce a capital gains tax. Photo / NZME

National finance spokeswoman Nicola Willis has been a key figure in her party's attacks on Labour over tax. Photo / Mark Mitchell National finance spokeswoman Nicola Willis has been a key figure in her party’s attacks on Labour over tax. Photo / Mark Mitchell

Almost half of Winston Peters' supporters surveyed by Ipsos say they are in favour of a wealth tax. Photo / Mark Mitchell Almost half of Winston Peters’ supporters surveyed by Ipsos say they are in favour of a wealth tax. Photo / Mark Mitchell