The 58-year-old accountant was a 17-year veteran of the NSW police finance department.
Curtis Cheng, who had worked in the NSW police finance department for 17 years, was leaving the state crime command in Parramatta in Sydney's west on Friday afternoon when he was shot from behind at close range by the teenager.
Mr Brain, who used to speak on police finance issues for the Association of Chief Police Officers (Acpo), said police forces that relied more on government grants than council funding would be worst affected.
Tim Brain, the recently retired Chief Constable of Gloucestershire and former national spokesman on police finance, has calculated that a cut of 40% (the government's worst-case scenario) could mean the loss of 60,000 posts - about a quarter of total officer and staff manpower.
At a press conference on Saturday, Police Commissioner Andrew Scipione called the shooting that killed Curtis Cheng, a 17-year veteran of the police finance department, "politically motivated and therefore linked to terrorism".
No other province has its police financing so carefully metered, American officials say.
Although a few provinces were still governed by senators (proconsuls or consuls), the majority were given to equestrian praesides, usually without any military power but with responsibility for the entirety of civil administration (justice, police, finances, and taxes).
Since the coup the United States has maintained and in some areas increased military and police financing for Honduras and has been enlarging its military bases there, according to an analysis by the Fellowship of Reconciliation.
It would also blur the lines of the structure in which the European Commission is supposed to be policing the finance ministers, ensuring that countries meet their economic objectives.
