On-Charging Utilities to Tenants in NZ: Water, Power, Gas, and Internet

The short version: if a property has separately metered utilities and the tenancy agreement allows for it, a landlord can pass on the cost of what the tenant actually used - not just water, but power, gas, or shared internet too, depending on how the property and the agreement are set up. The rules differ by utility type, and the manual admin of matching bills to tenancies and splitting them correctly is the same headache regardless of which one it is.

This page covers the general mechanics of on-charging utilities and how RentManager automates it. For the full legal detail on water charges under the Residential Tenancies Act, see our guide: Water Charges in NZ Rentals.

1. The pattern across utility types

Whatever the utility, the same three things generally need to be true before you can on-charge it:

• The usage is separately measurable for that specific tenancy (a dedicated meter, or a clearly attributable account)
• The tenancy agreement provides for it in writing
• You charge actual usage cost, not a markup, and not costs the tenant did not actually incur

Water has the most specific statutory rules in NZ (see the water article for the s.39 detail). Power and gas are more commonly billed directly to the tenant in their own name in the first place, which sidesteps on-charging entirely, but in shared-metering situations (a single power connection for a multi-unit property, or a landlord-held account during a transition period) on-charging power the same way you would water is common practice.

Internet is different. It is not usage-metered, so the "separately measurable usage" logic above does not apply. Where a landlord provides a shared broadband connection, common in a flatting arrangement with one household account, what actually happens is a flat monthly cost split evenly (or by an agreed share) between co-tenants, not a metered on-charge. It is a different mechanic wearing the same "who pays" question, and the tenancy agreement should say how it is split either way. For a worked example of splitting a shared bill between flatmates, see our co-tenancy guide.

2. Where the manual admin actually hurts

• Matching a bill to the right tenancy, especially across a portfolio of several properties, when the bill just says an address you have to cross-reference by hand.
• Splitting a bill between co-tenants on a flatting arrangement, correctly and consistently, bill after bill.
• Working out the on-chargeable portion when a bill mixes a fixed charge with a usage charge, easy to get wrong, expensive if a tenant disputes it.
• Doing this every single billing cycle, for every property, indefinitely, the actual time cost that adds up over a portfolio.

3. How RentManager handles it: any utility, not just water

• Bill-upload matcher. Upload one bill or a batch, PDF, photo, or forwarded email, and RentManager works out which tenancy it belongs to by service address, whether it is water, power, gas, or another utility.
• Per-tenant apportionment. Co-tenancy properties get the bill split cent-exact between flatmates automatically.
• Learns your provider, then remembers it. For utility types and suppliers outside our pre-built catalog, RentManager reads the bill, you confirm the amount is correct the first time, and from then on that supplier's bill layout is recognised automatically, no repeat manual entry.
• Two-sided lifecycle. The charge is raised, the tenant notified, and the payment tracked and matched back to your ledger, not a one-off invoice you then have to chase separately.
• Deterministic where it can be. Major NZ water suppliers (Watercare, Wellington Water, and others) are already pre-catalogued with zero setup required; everything else uses the confirm-once path above.

Upload a real utility bill and watch it get matched, split, and readied to charge in the live demo. Try it in the demo.

4. Quick answers

Does this only work for water? No, the same tool handles power, gas, and other separately-billed utilities. Water simply has the most pre-built supplier coverage today because it is the most common on-charge case in NZ.

What happens the first time RentManager sees a new supplier's bill? It reads what it can and shows you the extracted amount to confirm. Once you confirm it is correct, that supplier's layout is remembered for every future bill.

Can I on-charge power if the whole property has one shared meter across several tenancies? Only if usage can be fairly and clearly apportioned and the agreement allows it, the same logic that applies to shared water metering.

What about splitting internet between flatmates? That is a flat-cost split rather than a metered on-charge, there is no usage to measure, just an agreed share of one account. RentManager's per-tenant apportionment handles this the same way it splits a metered bill, cent-exact between co-tenants.

Is this different from splitting a bill manually in a spreadsheet? Functionally it does the same maths, but it does it automatically from the actual bill, tracks who has paid, and keeps a record, not a spreadsheet you maintain by hand every quarter.

Stop manually splitting utility bills every billing cycle. Try RentManager free, no credit card required.