She was also unable to say the number of people who had received emergency housing loans.
The OIA response also revealed MSD staff had made no reports to its leadership team -- or to ministers - in the 18 months before the issue flared up in the media.
An MSD spokesman said there was now a commitment to develop an emergency housing model which targets funding and "allows us to track need far more effectively".
"It's either negligence or deliberate," said Child Poverty Action Group housing spokesman Frank Hogan. "Negligence in the failure to take the information or its done deliberately ... because it may be that New Zealand is scandalised at the necessity to supplement payment needs for our most vulnerable."
Labour's Carmel Sepuloni said solid data was needed and the lack of it was reflected in the Government being "all over the place on this issue".
Social Development Minister Anne Tolley and Social Housing Minister Paula Bennett have now moved to provide 3000 emergency housing places each year, putting up $41m over four years to contract emergency housing providers and to cover emergency housing grants.
Tolley said a new non-recoverable grant would help MSD "get a better idea of the level of debt clients have that relates to emergency housing".