When do I need a lawyer vs an accountant?

Reference guide from Amplifai — the structured AI workspace for NZ business decisions.

Decision · Structure & governance

The short version

Most people get told this is a choice between two professionals — lawyers do legal stuff, accountants do tax stuff, you'll know which you need. That's the wrong shape. The choice that matters is recognising what kind of problem you have in front of you, because most problems route cleanly to one or the other and the cost of routing wrong is significant. The other piece of the picture, specific to NZ: most SMB owners are already in an ongoing relationship with an accountant — they're the first call by default — and engage a lawyer transactionally when something specific happens. Two statutory threshold concepts most SMBs don't know about decide where the lines fall: the reserved areas of work under the Lawyers and Conveyancers Act 2006 (work that only a lawyer can do, regardless of price preference)¹ and the tax agent registration under the Tax Administration Act 1994 (which gets you the extended filing deadline and direct IRD correspondence rights).²

This entry tells you how to recognise which professional your situation routes to, when you need both, and when you don't need either.

Where to find the authoritative answer

Four places worth knowing about. Each does a different job.

NZ Law Society — Te Kāhui Ture o Aotearoa. Professional body. The regulator and registration body for lawyers. The "Find a lawyer" directory is the baseline check — being on the register means current practising certificate, which means LCA conduct rules apply and the Lawyers' Complaints Service is available if it goes wrong.

Chartered Accountants Australia and New Zealand (CAANZ) and CPA Australia (NZ). Professional bodies. The two main accountant-side registration bodies in NZ. Most NZ accountants you'll deal with are CA ANZ-registered; CPA is the alternative. Membership of either gives you a regulator to complain to.

Inland Revenue — Tax agents and other intermediaries. Government / authoritative. Operational guidance on what registered tax agents, bookkeepers, and other intermediaries can do — including the extension-of-time arrangement that's the operational difference between a registered tax agent and an accountant who isn't one.

Citizens Advice Bureau and Community Law Centres. Free first-stop resources. CAB covers general legal information at no cost. Community Law Centres provide legal advice to those who qualify on means or topic. Worth knowing about for low-stakes questions on settled territory — they're not a substitute for paid advice on commercial matters, but they're a sensible first call before deciding whether to pay.

What to watch for

Six things to know about how the lawyer-vs-accountant call actually plays out in NZ.

1. Some work is reserved to lawyers — the choice isn't lawyer vs accountant, it's lawyer or nothing. Section 6 of the Lawyers and Conveyancers Act 2006 defines reserved areas of work: giving legal advice on proceedings the person is considering or has brought before any NZ court or tribunal; appearing as an advocate before any NZ court or tribunal; representing someone in proceedings; and any work that other statutes require be done by a lawyer (the s21F certifications under the Property (Relationships) Act 1976 are the canonical example).³ Section 24 makes it an offence for a non-lawyer to carry out reserved work. The Law Society treats conveyancing broadly enough that business sale and purchase legal work is reserved territory even when no land is involved. If your situation touches any of this — you're being sued, considering suing, signing a relationship-property agreement, buying or selling a business — you don't have a routing choice. The cheaper-professional option isn't available.

2. For tax, only a registered tax agent gets you the extended filing deadline and direct IRD correspondence rights. Anyone with the relevant knowledge can prepare your tax return. Only an IRD-registered tax agent — someone meeting the Tax Administration Act 1994 s124C/s124D threshold of preparing annual tax returns for 10 or more clients — can file with the extension of time arrangement (deadline shifts from 7 July to 31 March of the following year) and correspond with IRD directly on your behalf under the s37(4) framework.⁴ If you're choosing between two accountants and one isn't a registered tax agent, you're choosing two different operational arrangements, not two different prices. The deadline difference alone is worth roughly nine months of breathing room; the direct-correspondence rights matter the moment IRD raises a question. Worth asking explicitly when you're picking an accountant — and worth re-checking, because not all bookkeepers and not all accountants who advise on tax are themselves registered tax agents.

3. Use each profession the way it's structured to be used. Accountant questions can be casual ("does this expense look right?") and you'll often get the answer in the same conversation as your monthly catch-up — they're set up for that. Lawyer questions should be packaged: write down what you actually want answered, gather the relevant documents first, ask in one go rather than across three emails. The trap most SMBs hit is the inverse — under-using the accountant relationship they're already paying for, then asking a lawyer the same way they'd ask the accountant and being surprised by the bill. If you've got something you'd raise with your accountant in passing, raise it. If it's lawyer-shaped, treat the call as a real engagement and prepare for it.

4. Disputes, employment issues, contracts with long tails, and IP need a lawyer — not an accountant — even though the accountant's instinct is sometimes good. Defending a personal grievance, debt recovery past the Disputes Tribunal level, IP licensing or assignment, anything heading toward formal dispute resolution, regulator correspondence with legal implications — all lawyer territory under the LCA s6 reserved-areas framework or under the operational reality that these are legal-shaped questions. Your accountant's instinct on the financial dimension is often genuinely useful and they may be the one who spots the issue first. They can't (and the LCA forbids them to) provide legal advice on proceedings. The right play is usually: accountant flags it, you bring in the lawyer, accountant stays in the loop on the financial side.

5. Some decisions need both — and the sequence matters. Selling a business, restructuring at scale, bringing in significant co-owners or investors, succession planning, transitioning entity structure — these need both professions and the order is usually accountant first to model the tax position, then lawyer to structure the documents. Trying to economise by using one or the other alone is the most expensive variant of these decisions. The accountant tells you what the deal should look like financially; the lawyer makes sure the deal as written delivers that financial outcome. Skipping the accountant means signing documents whose tax consequences you don't fully understand; skipping the lawyer means a financially-sound deal recorded in documents that may not actually do what you think.

6. The "you almost certainly need a lawyer" trigger list is short and specific. You're being sued or seriously considering suing. You're selling or buying a business. You're bringing in significant co-owners or investors (shareholders' agreement, share issuance, capital contributions). You're signing a long-term commercial lease or a significant supply contract with indemnity or liability terms you can't assess. You're in an employment dispute that's escalated past the conversation stage. You're dealing with a regulator (Commerce Commission, FMA, Privacy Commissioner, Worksafe, Employment Relations Authority) in any capacity beyond responding to a routine enquiry. The list is shorter than law-firm marketing implies, but each item on it is genuine — and if you're in any of these, the cost of not getting a lawyer is usually much higher than the cost of getting one.

A separate point on what the call really is. The decision that comes up most often isn't which professional — it's is this situation worth professional cost at all. Most operational SMB moments don't need either profession; the next layer of moments needs one of them; a small subset needs both. The shape of the relationship itself tells you most of what you need to know: you'll probably know your accountant's wife's name; you won't know your lawyer's. The accountant is in your operating rhythm — monthly catch-ups, quick questions in passing, the marginal cost of asking is close to zero. The lawyer is someone you call when something specific has happened, and each call is its own piece of work. The watch-fors above are for the cases where that lived asymmetry doesn't reach — the s6 reserved-areas line that means the cheaper option isn't legally available, the tax-agent registration that determines what an accountant can actually do for you operationally, the sequencing call when both professions are required. The free first-stop options (CAB, Community Law Centres, business.govt.nz, IRD myIR) are worth scoping first for low-stakes questions on settled territory; they often establish that no paid advice is needed at all. Where paid advice is needed, the right question isn't who's cheaper — it's what kind of problem is this, and which professional is the right fit.

Where this entry stops

This entry covers the routing call — when to engage a lawyer, when to engage an accountant, when both, when neither. It doesn't cover:

How to choose a specific lawyer or accountant. Different question — the Law Society's "Find a lawyer" directory, CA ANZ's "Find a CA" directory, and personal referral from someone who's used them on a similar matter are the standard routes. Specialism matters: an employment lawyer isn't a property lawyer, and a tax accountant isn't a forensic accountant.
Specific legal advice on any situation. This entry is a routing layer, not a substitute for advice. If a situation looks like lawyer territory, the next move is a lawyer, not more reading.
Specific tax advice on any situation. Same — the entry tells you when to engage a tax-side professional, not what the tax answer is.
Fee structures and pricing benchmarks. Both professions price variably depending on specialism, region, and engagement model. The rough shape (accountants fixed monthly; lawyers hourly or engagement-based) is named in watch-for #3; specific numbers move enough that any benchmark here would be stale fast.
Trusts, complex structures, multi-jurisdictional situations. Specialist territory in both professions — the routing call gets sharper at scale and warrants its own conversation rather than a general entry.
Sector-specific situations where the routing differs. Financial services (FMA-regulated advice), legal practice (LCA-regulated), medical practice (HPCA-regulated), construction (Building Act / CCA contracts) all carry sector-specific advisor frameworks. The general routing here is the baseline, not the full picture.

If you're not sure whether your situation crosses the s6 reserved-areas line, ask. Lawyers will usually answer that question without engaging full advice. If you're picking between accountants and tax-agent status matters to you, ask explicitly. And if you're at any of the watch-for #6 trigger points, stop reading wayfinder content and book the call — the cost of getting professional advice early is meaningfully lower than the cost of getting it late.

Last verified 12 May 2026 against the Lawyers and Conveyancers Act 2006 (sections 6, 21, 24, 27), the Tax Administration Act 1994 (sections 37, 124C, 124D), and Property (Relationships) Act 1976 (section 21F) at legislation.govt.nz, cross-checked against IRD's Tax Agents operational guidance, the IR9XA April 2026 Extension of Time agreement, and NZ Law Society regulated-services commentary current at that date. Note: the IRD Regulatory Framework for Intermediaries (RFI) consultation opened on 5 May 2026 — substance of the tax-agent EOT arrangement is stable as of writing but the registration mechanics may change over 2026-27. Full source list: references.