The Department of Internal Affairs neglected to include the entire month of June while calculating ministerial expenses for the last quarter, delaying their public release.
Nearly two weeks ago, the Department of Internal Affairs (DIA) issued a statement saying the travel and accommodation expenses of ministers for the June quarter would be delayed due to a "process error" that occurred during collation.
The expenses are usually released at the same time the Parliamentary Service releases the same figures for all other MPs.
However, MPs' expenses for travel and accommodation were publicly released on August 16, and a week later DIA said expenses for ministers, including Prime Minister Jacinda Ardern, would be further delayed after an oversight was noticed during a "quality assurance, pre-publication verification process".
The Herald has been told that oversight was the omission of ministers' expenses for the entire month of June.