The Short Answer
Yes — KiwiSaver is generally relationship property to the extent it accrued during the relationship. The Property (Relationships) Act 1976 captures superannuation entitlements, including KiwiSaver balances, that were built up while the couple were together. The starting principle under the Act is equal sharing of relationship property, regardless of whose name the account is in or who earned the money.
What is not relationship property is the part of the balance that existed before the relationship began. Those contributions stay separate property. The hard part is rarely the principle; it is establishing the numbers, because that means working back through years of contributions, employer contributions, government contributions and investment gains and losses.
This page is general information about how the framework works. It is not legal advice, and relationship property settlements turn on individual facts.
Who the Act Covers
- Married couples.
- Couples in a civil union.
- De facto couples, including same-sex couples, who have lived together for the qualifying period.
The Act also governs what happens on the death of a partner, not just on separation. The Ministry of Justice publishes plain-English guidance on relationship property, and the definitions and qualifying periods are set out in the Act itself.
What Is In and What Is Out
| Part of the KiwiSaver balance | Usually treated as |
|---|---|
| Contributions and growth during the relationship | Relationship property — shared equally |
| Balance at the start of the relationship | Separate property |
| Growth on the separate-property portion | Depends on the facts and any agreement — get advice |
| Everything, if the couple have a valid contracting out agreement saying so | As set out in the agreement |
Because the split point is a date and the balance moves daily, both providers may need to calculate an apportionment. That is why KiwiSaver settlements often take months rather than weeks, and why they can hold up the wider property settlement.
How a KiwiSaver Split Is Actually Done
There is no online form that moves money between two KiwiSaver accounts. There are three practical routes:
- Direct transfer between providers. Funds move from one partner's KiwiSaver account to the other's. The retirement-savings character of the money is preserved — it stays locked in until 65 or another qualifying event. This requires a Family Court order, which brings legal and court costs, and some providers do not offer it. Processing can be administratively complex.
- Withdrawal to one partner. Also requires a Family Court order. The money leaves KiwiSaver, which creates immediate cash-flow pressure later in life.
- Offsetting against other relationship property. By far the most common route. If one partner has $50,000 more in KiwiSaver, the other might take $25,000 more from the sale of the family home. No court application is needed if both agree, both partners keep their KiwiSaver intact, and it is faster and cheaper. Its limit is that it needs enough other property to balance against.
Contracting Out Agreements
A contracting out agreement — a "pre-nup" or "prenup", formally an agreement under the Property (Relationships) Act 1976 — lets a couple specify in advance what stays separate and how ongoing contributions and growth are treated. For KiwiSaver the useful clauses typically cover:
- whether the pre-relationship balance stays the separate property of one partner;
- how contributions made during the relationship are treated;
- whether the growth on the separate-property portion is shared;
- what happens if the couple separate after a long period, when tracing the original balance is difficult.
An agreement signed when both balances were small is much easier to apply than a reconstruction attempted twenty years later.
Complications Worth Knowing About
- Valuation cost. Providers charge for the apportionment work, and for some couples the accounting cost is a meaningful part of the dispute.
- Timing. Calculations can take several months, delaying the overall settlement and adding legal cost while it waits.
- Money already withdrawn. If KiwiSaver was used for a first-home purchase during the relationship, the withdrawn amounts may still be relationship property that has to be accounted for — the money being spent does not remove it from the pool.
- Business owners and property investors. Where there are other assets, restructuring can be a better solution than accessing KiwiSaver directly.
- Tax consequences. Transfers between KiwiSaver schemes and withdrawals can create different tax outcomes, so the structure of the settlement matters.
Common Mistakes
- Assuming KiwiSaver is untouchable. Many people treat it as entirely separate from the relationship pool. It is not.
- Assuming it is all shared. Pre-relationship balances are separate property, and ignoring that gives away value.
- Trying to move money without an order or agreement. A provider cannot act on an informal arrangement between two people — it needs proper authority before it will transfer or release funds.
- Leaving the KiwiSaver question to the end. Valuation takes months; start it early so it does not delay everything else.
- Relying on online summaries instead of advice. The framework is straightforward, the arithmetic and the tax outcomes are not.
Where to Get Help
The Ministry of Justice publishes guidance on understanding relationship property and how it is divided. For anything beyond the general principle, talk to a family lawyer who deals with relationship property, and expect to need contribution records from your KiwiSaver provider.