National's been trying to get farmers onside, rallying against Labour's proposed water tax.
Dairy New Zealand has crunched the numbers and says Labour's proposed water use tax would add around $45,000 to each irrigating farm.
Labour's potential coalition partner the Greens, would add more than $11,000 per farm with its Nitrogen Pollution Tax, while its proposed carbon tax could add nearly $7000 to each farm.
All up, the three taxes could cost an average of $18,000 dollars a year per farm - or $63,000 a year for farmers that irrigate water.
Dairy New Zealand CEO Tim Mackle spoke to Duncan Garner.
Watch the video for the full interview.
