The Assembly agreed last week to push back the commission's commencement date until December 1.

The start date had already been delayed after the appointment of the original pick for the commissioner's role, former ACT chief justice Terrence Higgins, was scuttled by the Liberals amid concerns about his previous political affiliations.

Mr Higgins was ACT Labor's inaugural president in the 1970s, but quit the party in 1990 ahead of his appointment to the bench.

Former federal court judge and Australian Electoral Commission chairman Dennis Cowdroy was eventually appointed to the position in May. The commission had been scheduled to start work on September 1, two months after Mr Cowdroy was officially due to begin in his role.

But in a letter this month to Speaker Joy Burch and party leaders, Mr Cowdroy said the two-month window was "unlikely to be [a] sufficient" amount of time in which to hire a chief executive, find and fit out office space, develop a framework to measure the commission's performance and create a website.

He said delaying the start of the commission for a further four to six months would be "prudent".

Ms Burch tabled last week Mr Cowdroy's letter in the Assembly, before elected members agreed to amend the Integrity Commission Act to allow the start date to be delayed until December 1.

It could still start earlier, if the commission is ready to go before December.

Ms Burch was hopeful it could start early. "I think it is the wish of all concerned that that happens," Ms Burch said.

The commission will be charged with investigating allegations of corruption involving public servants, politicians, and government contractors, with a focus on serious and systemic cases. It will also deal with allegations of serious misconduct.

The government has committed $8 million over four years to establish the commission, which will have about 10 staff.

Mr Cowdroy will receive the same pay as a Supreme or Federal Court judge, meaning he could receive up to $458,840 a year.