The largest apple and pear grower and packer in the country paid $350,000 of carbon tax last year.

Geoffrey Thompson Holdings, at Shepparton in northern Victoria, supplies major supermarkets year round and says it can't pass the cost of the tax on.

Managing director Gary Parker says the company can't afford to do anything about lowering emissions until after the next election.

"We have looked at various options. All of it requires significant capital investment.

"There is now talk of changing and bringing the ETS (emission trading scheme) in 12 months earlier.

"If there is a change of government, the Coalition are saying they are going to scrap it.

"So while this uncertainty is around, we can't really make any long term investment decisions."