Deputy Prime Minister Barnaby Joyce has refused to reveal the cost-benefit analysis of moving a Canberra-based agricultural agency to his electorate.

Mr Joyce has pushed ahead with plans to relocate the Australian Pesticides and Veterinary Medicines Authority from the capital to Armidale, in northern NSW, despite concerns from farming groups and staff.

He has told the ABC's Insiders progam a study revealed there were positives and negatives to the move.

"The cost-benefit analysis is complete and in some areas it's indeterminate some areas. It's saying yes, it's sort of a benefit here, other areas it's saying it's marginally not of benefit," Mr Joyce said.

Insiders' host Barrie Cassidy asked if the Deputy Prime Minister would release the analysis, to which he replied: "No, I don't think I will at this stage."

"Because the decision has been made, the decision's been made by the Australian people," he added.

Mr Joyce announced the decision in June, ahead of the federal election in July.

At the time he said the relocation of the registration authority to Armidale would create an agricultural centre of excellence in his electorate of New England.

"I've been fighting for this for years," he said.