Former Labor treasurer Wayne Swan has delivered his assessment of Joe Hockey's first media conference in front of the Canberra press gallery as treasurer - "stop behaving like a childish politician".

Mr Hockey released the final budget outcome (FBO) for the 2012/13 on Friday, which showed an $18.8 billion deficit.

"Rather than focus on his job as treasurer to update the budget, Mr Hockey used his entire FBO statement to attack Labor and divert attention from criticism he is hiding his own budget books," Mr Swan said in a statement.

"His performance today was misleading at best; and incredibly irresponsible and reckless at worst."

The government has indicated that the mid-year economic and fiscal outlook (MYEFO) will not be released until January.

Mr Swan says of the 15 MYEFOs since 1998 - under both Liberals and Labor - not one has been delivered so late.

He says Mr Hockey now has access to all the information and advice he claimed he couldn't access from opposition, but delaying the update is more evidence he deliberately lied about a 'budget emergency' only months ago.

"The coalition inherited one of the strongest performing economies in the developed world from Labor, it's time for Mr Hockey to grow up and acknowledge that."