Voters are being urged not to let John Key's admission about his links to foreign trusts go unnoticed.
The Prime Minister has money deposited in a company specialising in foreign trusts and Greens co-leader James Shaw says it looks murky and is further proof a law change is needed.
"Our laws, we aid and abet people in New Zealand and around the world, to essentially minimise and avoid paying tax. It's that unfairness that I think people are so angry about."
A tax expert has been appointed to review New Zealand's rules around foreign-owned trusts.