Prime Minister John Key says MPs are complying with Parliament's property disclosure rules.
MPs must declare any superannuation schemes they are in on the annual register of pecuniary interests.
However, they do not need to record property owned by those schemes. That means they can live in houses in Wellington purchased by that scheme and claim an accommodation allowance.
Mr Key said on Monday it is not a loophole that allows MPs to avoid listing property assets.
He said a number of MPs have sought to give more information about assets owned by super schemes on the register, but were advised not to by officials.
Mr Key said if Parliament decides to review the rules, the National Party would be happy with that.