Inheritance, Gifts, and Relationship Property in New Zealand

Inheritances and Gifts Start as Separate Property

Under Section 10 of the Property (Relationships) Act 1976, inheritances received by one partner from a third party are classified as separate property. The same applies to gifts. If your parents give you $50,000 or you inherit a bach from a grandparent, that asset belongs to you alone — it does not automatically enter the relationship property pool to be split 50/50 upon separation.

This protection exists regardless of when the inheritance or gift was received. It can arrive during the relationship and still qualify as separate property, provided it stays separate.

The Intermingling Rule Changes Everything

Section 9A of the PRA is where most inheritance protections fail. Separate property loses its classification and becomes relationship property if it is mixed or intermingled with relationship property to the extent that it would be unreasonable to keep it separate.

The most common scenario is depositing an inheritance into a joint bank account used for household expenses. Once the funds mix with relationship income — wages, salary, everyday spending — the inheritance becomes intermingled. Upon separation, it joins the pool and gets divided equally.

Using inheritance money to pay down the joint mortgage has the same effect. The family home is always relationship property under the PRA, and injecting separate funds into it converts those funds into relationship property. The same applies to using a gift to renovate the kitchen, buy a family car, or pay for a shared holiday.

How to Protect an Inheritance or Gift

The rules are mechanical, not discretionary. If you keep the money isolated, it stays separate. If you mix it, it does not.

Practical protection means keeping inherited or gifted funds in a sole-name bank account that is never used for joint household expenses. Do not transfer anything in or out that connects to relationship finances. Maintain a clear paper trail showing the origin of the funds — the executor's distribution letter, the donor's bank transfer receipt — and the unbroken chain of custody in your sole-name account.

If you use inherited money to buy an asset, keep that asset in your sole name and do not use it as a family resource. An investment property purchased with inheritance money and kept in your name, with rental income going into your sole account, has a much stronger claim to separate property status than the same property if rental income was pooled into the joint account.

What About Growth on Separate Property?

The PRA draws a further distinction. If the value of separate property increases during the relationship due to the application of relationship property or the efforts of either partner, that increase can become relationship property. A pre-relationship investment property that doubles in value because both partners spent weekends renovating it may have its appreciation classified as relationship property, even if the original asset remains separate.

Growth that occurs passively — market appreciation, interest on a term deposit — has a stronger claim to remaining separate, particularly when no relationship resources contributed to it.

The Contracting-Out Agreement Option

The most robust protection for a significant inheritance is a contracting-out agreement under Section 21 of the PRA. Both partners agree, with independent legal advice, that specific assets (the inheritance, a gift, a family trust distribution) will remain separate property regardless of how they are used. This agreement can be made at any point during the relationship and overrides the default intermingling rules.

Without a contracting-out agreement, the protection depends entirely on physical and financial separation of the assets.

The NZ Financial Split Navigator includes a Separate Property Tracing Worksheet designed to document the origin, movement, and current status of inherited or gifted assets — building the evidence trail that determines whether those assets stay yours or enter the shared pool.

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