"NZX is also concerned about the fairness of the Tax Working Group's recommendations, and the different tax treatment proposed for direct investment compared to managed funds and KiwiSaver, which if implemented, would narrow participation in the New Zealand market," Peterson said.
He said the NZX did not want to see tax settings which would create preferences for offshore investment, adding a strongly performing and efficient capital market requires the broadest possible participation from a wide range of investors.
"Our capital market is a significant part of New Zealand's economy, which needs to keep growing," he said.
"The recommendations outlined today are not fair on New Zealand businesses and may pose risk to economic growth."
The Tax Working Group said any gains on the sale of these assets would be added to the seller's overall yearly income and be taxed normally at realisation – meaning a CGT would only take effect when it became law.