Federated Farmers vice-president Andrew Hoggard said yesterday a tax on water had been confirmed.
But Labour leader Jacinda Ardern had refused to rule out a capital gains tax, a land value tax, and an asset and wealth tax, other to say the family home was exempt.
For farmers, their home and surrounding land also happened to be their business and livelihood, Mr Hoggard said.
''Even if an exemption applied to the farmhouse, they'll cop it from new taxes far more than their urban cousins.''
The prospect of a land tax, in particular, was alarming to the rural sector, he said.
It would have a severe impact on land-intensive businesses and others - the so-called ''asset rich and income poor''.
The last time a land tax was considered, in 2010, the agricultural taxable land base was $105billion, meaning a 0.5% land tax would cost farmers $535million a year. That was a massive hit on the sector, regional economies and rural towns, he said.
Farmers already paid ''whacking'' rates bills in many parts of the country, often disproportionate to the services delivered or used.
Labour had delivered more detailed information on its water tax proposal when pushed into it by Federated Farmers, irrigation and other groups.
Labour primary industries spokesman Damien O'Connor was less than impressed with the figures supplied by Mr Hoggard.
''He must have got his figures from his National Party mates, and we've all learnt this week not to trust any of their mathematics.''
