While some trustees have accepted applications from the Insolvency and Trustee Service to withdraw money on grounds of significant financial hardship, more recently they have declined them.
That has prompted an official assignee to go to the High Court "seeking clarity around its rights in this respect and whether it can access KiwiSaver accounts before the standard date of access, which is when an individual turns 65" a ministry spokesman said.
A court hearing is set down for February 24 and 25 in the High Court at Wellington.
But Trustees Executors northern regional manager Clynton Hardy disputes the logic of the official assignee's case.
Paying out KiwiSaver cash under the serious financial hardship provision benefits only the bankrupt's creditors rather than the bankrupt themselves, he said.
"There's a very good argument that when a KiwiSaver member goes into bankruptcy, the act of going into bankruptcy alleviates their financial hardship because their creditors can no longer pursue them."
And while the ministry is seeking a declaratory judgement which might otherwise be expected to set a precedent for other instances where a member is being pursued for cash, Mr Hardy says that won't happen.
Releasing cash under the hardship provision was entirely at the discretion of the trustee, and the court could not force them to do it, he says.
"This action we believe will not create a precedent so you've got to ask why is it continuing?"
Mr Hardy questions why a bankrupt's KiwiSaver should be targeted.
"Sometimes the bankruptcy is well beyond the individual's ability to manage, but all this would do is divert those funds to creditors and then the state will have to pick up the care of that person when they reach retirement age."
Bankruptcy figures
*In the last (2012-13) financial year 2199 people were adjudicated bankrupt
*Of these, 29 per cent had KiwiSaver accounts
*Once a bankrupt reaches 65, MBIE's Insolvency and Trustee Service is entitled to withdraw all the money in their KiwiSaver account to pay creditors.