How a de facto relationship is proved
Updated 2026-08-09. General information, not legal advice.
A de facto relationship is proved the way it is defined: by the whole picture of two people living together as a couple. The evidence tracks the section 2D factors, the shared home, finances, commitment, children, household life and how the relationship appeared to others, built from ordinary records: tenancy agreements and utility bills, bank statements, insurance and KiwiSaver beneficiary nominations, travel bookings, photos and messages, and what family and friends observed. This page is written for couples planning ahead who want to understand what the law would look at, not as a litigation guide.
The evidence behind each factor
Shared home: tenancy or ownership documents, mail to the same address, both names with utilities. Finances: joint accounts or regular transfers, shared bills, one partner covering the other's costs. Commitment to a shared life: plans made together, savings toward joint goals, being each other's emergency contact or beneficiary. Children: birth certificates, shared care routines. Public life: invitations addressed as a couple, social media, how each of you is introduced. No single item proves anything; the accumulation does.
Why would you ever need to prove it?
The status gets tested when its consequences bite: property division when a relationship ends, claims when a partner dies, and dealings with government agencies whose rules turn on relationship status. In the property context, one person often argues the relationship qualified while the other argues it did not, or that it started later, because the three year threshold and everything that flows from it hangs on those facts. It is an expensive argument precisely because the evidence is diffuse.
The planning alternative to proof
Couples reading this ahead of time have an option the litigants never had: put the facts beyond argument. A contracting out agreement records that the relationship exists and when it began as agreed facts, alongside the property rules you choose. Nobody ever has to reconstruct your relationship from bank statements, because you wrote the answer down while you agreed.
Common questions
- What evidence shows a de facto relationship in NZ?
- Records matching the section 2D factors: shared address documents, financial interdependence, commitment to a shared life, children and their care, household arrangements, and the relationship's public face. Courts weigh the combination, not any single item.
- Who has to prove the relationship existed?
- Whoever asserts it, typically the partner claiming property rights under the Act. The other partner may equally need evidence for the opposite position, which is why the uncertainty serves nobody.
- Can we simply declare we are not de facto?
- A private declaration does not change the legal facts; status follows how you actually live. What you can validly do is agree your own property rules in a contracting out agreement, which makes the classification argument largely pointless.
Sources
All information published on prenup.nz, including this guide, is general information only and is not to be construed as legal advice. We strongly recommend seeking independent legal advice about your own situation. A contracting out agreement only binds you once each partner has taken independent legal advice and a lawyer has witnessed and certified each signature, as section 21F of the Property (Relationships) Act 1976 requires.