Local Government Minister David Carter is looking at whether change is needed to the rules for anonymous donations to council candidates.
Police are investigating donations received by ACT leader John Banks when he ran for the Auckland mayoralty in 2010. Mr Banks insists he acted within the law.
The Local Electoral Act says anonymous donations must be made in such a way that the candidate concerned does not know who made the donation.
The law for candidates standing for Parliament has more specific criteria for what constitutes an anonymous donation.
Mr Carter has asked the Department of Internal Affairs to prepare a report on the differences between the two pieces of legislation and whether they need to be better aligned.
He can't say if changes could be made before next year's council elections.
Labour says the law should be changed before then.