With seven ministers, that is an average of 4.4 free staff parks per office. The carparks are in the London Circuit Legislative Assembly precinct.

A spokesman for Chief Minister Andrew Barr said 15 vouchers were provided for the all-day parking area, eight parks were in front of the ACT parliament building and seven under the Nara building across London Circuit. Not all staff get parks, with about 50 ministerial staff employed at the moment.

Asked about the cost, the spokesman said the parks at the Nara building cost $4231 each. There was no budget impact from the other carparks in the assembly precinct other than fringe benefits tax, he said.

The 10 non-ministerial politicians also get a staff carpark each, plus an extra for Liberal Leader Jeremy Hanson's office and Speaker Vicki Dunne's office.

The fringe benefits tax bill totals about $100,000 a year for the staff parking.

For members of the public, parking in the all-day carpark near the Assembly building costs $15.70 a day, or about $3768 for a 48-week working year.

Each politician also gets a personal park.

Attention has turned to the carparks in the lead-up to the October election, when the ACT parliament makes room for eight new politicians. Assuming one staff carpark for each, the Assembly must find 16 new parking spaces.

Mrs Dunne said she had written to two ministers about the issue without response and she did not know where the parking spaces would be found.

Separately, nine spaces are used by Assembly administrative staff, for which the staff pay $6 a day. About half go to the senior staff and others are balloted. Because they are paid spots, albeit at a big discount, they don't attract fringe benefits tax.

Mrs Dunne said while she was reluctant to take parks from Assembly administrative staff, in the absence of a decision from the government to free up more parks, there would be no choice.

"Come November 1, every person who is elected is entitled to a park," she said.

Mr Barr is considering Mrs Dunne's letter on parking.