Deputy Prime Minister Barnaby Joyce has flatly refused a Senate order to produce a key document on his plan to forcibly move 175 public servants from Canberra to the heart of Mr Joyce's electorate.

A cost-benefit analysis on the move, produced by consultants Ernst and Young at a cost to taxpayers of $270,000, will remain under wraps despite an upper house vote in September requiring the minister to produce the document.

Forced relocation: Deputy Prime Minister Barnaby Joyce.

Mr Joyce's plan to move the Australian Pesticides and Veterinary Medicines Authority from Canberra to Armidale has been controversial from the start, attracting criticism from the animal health industry, Labor, the Greens, the APVMA public servants themselves and their trade union.