Splitting KiwiSaver When You Separate
💔 KiwiSaver and Relationship Property
When a marriage, civil union or de facto relationship ends, your KiwiSaver is not automatically yours to keep. In New Zealand, KiwiSaver is relationship property under the Property (Relationships) Act 1976, so the money you and your former partner built up while you were together is normally shared between you when you separate. That surprises a lot of people, because the account sits in one name and the contributions came out of one person's pay. What matters is not whose name is on the account, but when the money went in. This guide explains which part of a KiwiSaver balance gets shared, how the three-year rule works for de facto couples, how a split is actually carried out by agreement or by a court order, why the money usually stays locked inside KiwiSaver rather than being cashed out, and how a contracting-out agreement can change the outcome. This is general information, not legal advice, so always talk to a family lawyer about your own situation.
Relationship property vs separate property
The Property (Relationships) Act 1976 (often shortened to the PRA) sorts everything a couple owns into two buckets. Relationship property is shared, and separate property is not.
| Usually relationship property | Usually separate property |
|---|---|
| The family home and family chattels | Property owned before the relationship began |
| KiwiSaver contributions and growth added during the relationship | An inheritance kept separate from joint finances |
| Income and savings earned during the relationship | A gift made to one partner and kept separate |
| The increase in value of assets from joint effort | Certain property held in a family trust |
Separate property can lose its protected status if it gets mixed in with relationship property. If you inherit money and then pay it into a joint account or use it on the family home, it can become relationship property. Keeping separate money clearly separate, with records to prove where it came from, is what keeps it out of the shared pool.
Why KiwiSaver is treated this way
KiwiSaver is a form of savings, and savings built up during a relationship are relationship property no matter whose name they sit under. Four things flow into a KiwiSaver balance while you are working: your own contributions, your employer's contributions, the annual government contribution, and the investment returns earned on all of those. Every one of those streams that lands in the account during the relationship counts as relationship property, along with the returns those amounts earn.
A common myth is that KiwiSaver is safe because it is in one person's name and comes out of one person's wages. Under the PRA, the law treats a relationship as an equal partnership. The contributions built up while you were together are shared even if only one of you was earning and paying in.
The three-year rule for de facto couples
The PRA applies in full to marriages and civil unions, and to de facto relationships once they have generally lasted three years. A de facto relationship is two people living together as a couple who are not married or in a civil union. Once the three-year mark is reached, the same equal-sharing rules apply as for a married couple.
There are exceptions for shorter de facto relationships. A court can still divide property from a de facto relationship of under three years where there is a child of the relationship, or where one partner made a substantial contribution and it would be a serious injustice not to make an order. So a short relationship is not always outside the rules, but the starting point is that the Act does not apply until three years.
You cannot leave a claim forever. For a de facto relationship, an application to divide property generally must be made within three years of separating. For a marriage or civil union, the limit is generally 12 months from the date the marriage or civil union is dissolved. Get advice early so you do not miss a deadline.
Equal sharing is the starting point
For a qualifying relationship, the default rule is that relationship property is divided equally, so each partner is entitled to half. A court will move away from a strict half share only in unusual cases, for example where there are extraordinary circumstances that would make equal sharing repugnant to justice, or where one partner's economic position after separation is much weaker because of how the couple divided their roles. For most everyday KiwiSaver splits, the working assumption is a straight 50/50 of the amount built up during the relationship.
⚖️ How a KiwiSaver Split Is Actually Made
Knowing that KiwiSaver is shared is one thing. Actually moving the money is another. There are two ways a division becomes legally binding, and only after that can any KiwiSaver money change hands.
Two ways to divide relationship property
- By agreement: You and your former partner agree how to divide everything and record it in a written relationship property agreement. To be legally binding, each of you must get independent legal advice from your own lawyer, and each signature must be witnessed and certified by a lawyer who has explained the effect of the agreement.
- By court order: If you cannot agree, either of you can apply to the Family Court, which decides how the property is divided and can make orders that bind both of you.
Your KiwiSaver provider cannot split an account just because you ask, and a handshake deal is not enough. The provider needs either a qualifying written agreement or a court order before it will move any money.
The money usually stays locked in KiwiSaver
KiwiSaver is a retirement scheme, and the money is normally locked away until you turn 65. Separating does not unlock it. You generally cannot cash out a KiwiSaver balance simply to pay a former partner their share. Instead, the law allows the relationship-property share to move from one person's KiwiSaver scheme into the other person's KiwiSaver scheme, where it stays locked until retirement just as it was before.
Offsetting is the most common. Rather than touch the KiwiSaver at all, the account stays where it is and its relationship-property value is balanced against other assets. If one partner keeps a larger KiwiSaver, the other keeps more of the house proceeds or savings to even things up. A transfer is used when there is nothing else to offset against: an agreement or court order directs the provider to move the share into the other person's KiwiSaver account, still locked in.
Working out the shared portion
To divide a KiwiSaver fairly you first need to know how much of the balance was built up during the relationship. Your provider can give statements showing contributions and balances over time. The pieces are:
- The balance at the start of the relationship, which is generally the owner's separate property.
- The contributions, employer and government top-ups, and investment growth added during the relationship, which are generally relationship property.
- Any period after separation, which is often left out so that contributions made once you had split are not shared.
Valuation date
Working out what a KiwiSaver is worth means picking a date to value it. The default position is that property is valued as at the date of the court hearing or the date you settle, because balances keep moving with the markets. In practice couples often value the shared portion as at the date of separation, so that contributions and growth after you parted are not brought into the pool. A court has discretion to choose the fairest date. Because KiwiSaver balances rise and fall with investment markets, the date you pick can change the numbers, which is another reason to get advice.
You cannot defeat a claim by quietly moving money or contributions around once a relationship has ended. Trying to hide or shift relationship property can be unwound by a court and can count against you. Keep contributing normally, keep your statements, and sort the split through the proper process.
🛡️ Separate Property, Pre-nups and Getting It Right
Not every dollar in a KiwiSaver account is up for sharing. The parts that were clearly yours before the relationship, or that came to you personally and were kept separate, can stay with you. The challenge is proving it and keeping it clean.
Money from before the relationship
If you already had a KiwiSaver balance when the relationship began, that starting balance is generally your separate property. Only the contributions and growth added during the relationship go into the shared pool. This is why your opening balance at the start of the relationship matters so much, and why an old statement showing what you had back then can be worth a great deal at settlement.
Inheritances and gifts
Money you inherit, or a gift made to you alone, is separate property. If you receive an inheritance during the relationship and keep it apart from your joint finances, it stays yours. The danger is intermingling. The moment an inheritance is paid into a joint account, put towards the family home, or blended with relationship savings, it can change into relationship property. If you want to protect inherited money, keep it separate and keep the paperwork that shows where it came from.
Claiming that part of a balance is separate only works if you can trace it. Bank records, KiwiSaver statements, a will or an estate letter, and the dates money moved are all evidence. Without records, separate money can end up looking like shared money, and you can lose the protection.
Section 21 contracting-out agreements (pre-nups)
You do not have to accept the default rules. Section 21 of the Property (Relationships) Act lets a couple contract out of the standard 50/50 approach by making their own written agreement, sometimes called a pre-nup or a contracting-out agreement. It can be made before or during a relationship, and it lets you agree in advance what will count as separate property and what will be shared, including how KiwiSaver is treated.
These agreements only work if they are done properly. Each partner must get independent legal advice from their own lawyer, and each signature must be witnessed and certified by a lawyer who has explained what the agreement means. A court can still set an agreement aside if giving effect to it would cause serious injustice, but a well-drafted agreement with proper advice on both sides is a strong way to keep a KiwiSaver, a business or a family asset out of the shared pool.
Both a contracting-out agreement and a settlement on separation need each partner to have their own independent legal advice. Using one lawyer for both of you, or skipping the advice to save money, is exactly what makes an agreement easy to challenge later. Independent advice is a legal requirement, not an optional extra.
When to get proper advice
KiwiSaver is usually just one piece of a wider relationship property split that also covers the home, savings, debts, businesses and superannuation. The pieces interact, so it rarely makes sense to sort KiwiSaver on its own. A family lawyer can value the shared portion, weigh up offsetting against a transfer, and record the deal in a way that actually binds your provider and your former partner. The cost of good advice is small next to the value of a retirement balance built up over many years.
🔢 Worked Examples
These four examples show how the rules play out. The names and figures are illustrative, and real cases turn on their own facts and evidence.
Situation: Aroha and Tama have been married for 10 years. Neither had KiwiSaver before they married, so both accounts were built up entirely during the marriage. Aroha's balance is $85,000 and Tama's is $35,000.
If the couple own other assets, the simplest fix is offsetting: Tama keeps $25,000 more of the house proceeds or savings, and both KiwiSaver accounts stay untouched. If there is nothing to offset against, an agreement or Family Court order can direct Aroha's provider to transfer $25,000 into Tama's KiwiSaver, where it stays locked until retirement.
Situation: Mia and Jack lived together as a couple for two years, then separated. They have no children together, and neither made an unusual contribution to the other's finances. Mia's KiwiSaver is $22,000 and Jack's is $9,000.
The result would be different if there had been a child of the relationship, or if one of them had made a substantial contribution and it would be a serious injustice not to share. In those cases a court could still divide the property, so a short relationship is not always outside the rules.
Situation: Priya already had $40,000 in KiwiSaver when her relationship began eight years ago. Her balance is now $120,000. She and her partner are separating.
These figures are illustrative. The exact split depends on the provider's records and on how the growth on the original $40,000 is treated, which is a point that often needs legal advice. The key lesson is that the opening balance Priya can prove she had at the start of the relationship keeps that money out of the shared pool.
Situation: During his marriage, Wiremu inherited $50,000 from his late mother. He made a voluntary lump-sum contribution of the $50,000 into his KiwiSaver, kept the estate paperwork showing where the money came from, and never ran it through the couple's joint accounts.
Contrast this with what happens if Wiremu had paid the inheritance into the joint mortgage or a shared account first. Mixing it with relationship property could have turned all or part of it into shared property. Because he kept it separate and kept the records, the inheritance is protected. The ordinary contributions and growth built up in the rest of his KiwiSaver during the marriage are still relationship property and are shared as normal.
Figures and rules in this guide were checked in July 2026 against: the Property (Relationships) Act 1976 on New Zealand Legislation (legislation.govt.nz); the New Zealand Law Society guide to dividing up relationship property (lawsociety.org.nz); Community Law on classifying and valuing relationship property (communitylaw.org.nz); and Sorted on separating (sorted.org.nz). KiwiSaver settings and locking rules are from the KiwiSaver scheme rules administered by Inland Revenue (ird.govt.nz). This guide is general information, not legal advice.
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