Under Section 24 of the Rating Act, a local authority must state the financial year to which the rate applies and the date on which it must be paid. The Kaipara, Whangarei and the Far North District Councils currently collect rates on behalf of NRC.
NRC rates resolutions did not state a calendar date for their payment but said the dates and methods of payment of instalments, any discount or additional charges shall be the same as those of the three district councils. Justice Duffy said the rates resolutions were incomplete as they failed to fix a time for payment of the intended rates. She said the errors were serious and substantial.
"In short, the NRC has failed to exercise its statutory powers properly when determining rates resolutions and it has unlawfully sought to delegate the performance of a number of its functions in relation to rates to KDC," Justice Duffy said.
NRC chief executive Malcolm Nicolson said legal implications of the decision would not be clear until the court made a final decision.
That decision concerns an appeal by the Rogans from a judgment by Whangarei District Court judge Keith de Ridder late last year which ordered them to pay more than $20,000 in outstanding rates and penalties.
Both refused to pay rates and penalties from 2011 to 2015 because they claimed the KDC and the NRC issued them documents that did not comply with the Local Government Rating Act.