Risks of DIY legal documents drafted by AI
8 September 2026

The age of AI is rapidly changing many aspects of our lives. The legal world is pivoting and adopting these changes at the same rapid pace. When used skilfully, AI contributes to better client outcomes and provides a useful tool for practitioners. However, AI has perils for lay people using it to draft legal documents or obtain legal advice. 


The perils are particularly profound in the division of relationship property. For many people, a separation from their partner is one of the most challenging times of their lives: emotionally, mentally, financially and legally. Naturally, people are now turning to AI to assist them in navigating the challenges, including the drafting of a separation agreement. 


In New Zealand, the division of relationship property is governed by the Property (Relationships) Act 1976. Under that Act, couples may divide their relationship property by executing a separation agreement. For the agreement to be valid, it must be in writing and signed by both parties. In addition, each party must have independent legal advice before signing the agreement; their signature must be witnessed by a lawyer, and the lawyer must certify that they have explained the effect and implications of the agreement to their client. 


Frequently, banks will require parties to have a validly executed separation agreement as a condition of the lending. This is another cost, in an already expensive time. A quick Google, and off to the AI search engine to create an agreement! But, wait. This is where the perils arise. 


The AI agreement is skipping the fundamental steps that make your separation agreement durable and avoid future challenges. The last thing any couple wants following a separation is to find themselves back before a lawyer in 3 years because the agreement lacked a foundation: disclosure of all assets and liabilities, legal advice and a carefully crafted agreement which reflects the parties' unique circumstances. Each person is unique, and so are their assets and personal circumstances. 


The separation agreement document represents only a small portion of the work that a lawyer does for a client on separation matters. To avoid future problems with a separation agreement, documents supporting all assets and liabilities must be exchanged, arguments for any adjustments to equal division explored, and the client advised on the effect and implications of the agreement. An AI generated document does none of those things. 


So what are the key perils of an AI agreement? The real peril is that it lacks substance. It’s a bit like attempting to build a house without laying the foundations: it’s going to get wobbly. 


Also, AI frequently hallucinates. The words may look correct, and it’s well formatted. But the substance is incorrect – including references to sections of legislation. In short, add a good dose of salt when you read that AI analysis or document. 


If AI shouldn’t be used to draft your separation agreement, how can it help you in a separation? You will still need to visit an experienced relationship property lawyer. So, why not use AI to help you give them a well-structured collation of your information? All assets and liabilities with supporting documents need to be collated and shared with your lawyer. Use AI to help you with this process, so when you turn up for your first meeting, you have all the documents and a summary of the information. 


If this resonates with you, we are sorry to hear that you’re going through a tough time. The relationship property team at Willis Legal is here to help. Reach out to our experts. We’re here to deliver not only a result, but a durable agreement that avoids future disputes.


By Marla Alexander-Ward


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3 August 2026
1. Myth: “The Property Relationships Act applies after 2 years!” - Wrong Generally, the time period for a relationship to become what is known as a qualifying relationship under the Property (Relationships) Act 1976 is 3 years from the commencement of the relationship. This time period can be shorter if there is a child in the relationship or the applicant has made a substantial contribution to the relationship. The 2 year period is the period a married couple must be separated before the marriage can be dissolved (i.e. divorced). 2. Myth: “It’s my property – I can leave it to whomever I want!” Wrong (sort of) This statement highlights the tension between what lawyers refer to as “testamentary freedom” that a Will-maker has and rights certain persons have under various statutes and law. While it is true that a Will-maker can do what they want with their property, this is not absolute. A Court can order a different distribution where a Will-maker fails in what is known as their “moral duty” to make “proper maintenance and support” for family members. In addition partners have rights under the Property (Relationships) Act 1976, and the Law Reform (Testamentary Promises) Act 1949 can assist persons to whom the Will-maker has made promises to provide for them in return for work or services done in the Will-maker’s lifetime. The rules of equity may also affect the Will-maker’s testamentary freedom. 3. Myth: “I’ve been in a relationship for 30 years so surely I can make decisions for my partner who has lost mental capacity!” – Wrong Despite the length of a relationship (marriage/de facto/civil union) if one of the partners loses mental capacity the other partner has no right to make decisions for their incapacitated partner in relation to their property and/or their personal care and welfare, unless the incapacitated partner has completed Enduring Powers of Attorney. If the incapacitated partner has not completed Enduring Powers of Attorney applications to the Family Court will need to be made for the appointment of a Property Manager (or Administrator if there are not significant assets) and a Welfare Guardian. 4. Myth: “I can buy/sell a house without a lawyer involved” – Wrong (sort of) In theory, a layperson can buy or sell a home without the involvement of a lawyer but (and it is a big but) it would be very difficult to do so (not to mention the risk of doing so). If bank lending is involved, the bank will insist on the involvement of a lawyer to act on its behalf and may even decline to lend if a buyer is not legally represented. Even if the bank was prepared to lend it is likely it and its lawyers would impose so many conditions and requirements (in order to protect the bank’s position) that it may be practically too difficult for a buyer act for themselves. Furthermore, with the land register now being predominantly electronic, relying on lawyers with the requisite certifications, it will be difficult for a non-licenced person to transact the registrations. Again, in theory, these can be done manually in paper form but the formalities involved in doing so is likely to make it practically difficult (if not impossible) for a buyer or seller to do so. This is general information about the current law, not advice on a specific matter. Article by: Kevin Callinicos
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