A $20m bill for the technology and ongoing operation of a new child sex offender register will be picked up by the police.
Legislation allowing the police and Corrections to oversee a register for convicted child sex offenders has been introduced to Parliament. It would provide information such as fingerprints, photographs and addresses.
A document outlining the impact of the legislation on the police and Corrections has outlined how they will absorb some of the costs.
But it said they would not be able to pick up the technology, ongoing operation and evaluation components, which amount to $61 million.
Cabinet has only approved $35 million so far, and about $20 million of the shortfall is to be funded by the police.
Social Development Minister Anne Tolley said additional funding would come from future budgets, savings from reviews and contributions from other agencies.