The Unclaimed Money Act 1971 sets rules for money in New Zealand that is owed to someone but has sat untouched long enough to become unclaimed money. If your business is a covered holder and the legal test is met, you may need to try to find the owner, gather the required information, and pay the money to the Commissioner of Inland Revenue.
For small businesses, the common risk area is dormant balances rather than day-to-day trading income. Think old customer deposits, trust account balances, money held on behalf of clients, or amounts left owing after a business relationship has gone quiet. The Act also deals with some situations where a business stops trading while still holding money owed to others.