When Kiwis talk about “the Big 4,” they could mean two different groups: the four major banks that dominate New Zealand’s finance sector, or the four global accounting and advisory firms that audit its biggest companies. Both shape the economy. This guide explains who they are, how they compare, and what alternatives exist. It’s general information, not financial advice.
The Big Four banks
New Zealand’s retail banking is dominated by four institutions — all subsidiaries of Australian parent banks — that together hold roughly 85% of the country’s lending and deposits.
The big four accounting & advisory firms
Global professional-services networks with major NZ offices — audit, tax, consulting and advisory.
| Firm | In brief |
|---|---|
| Deloitte | Among the largest globally; strong in consulting and large-scale transformation. |
| PwC | Strong in assurance, tax and deals, with a large public-sector presence. |
| EY | Known for strategy and transactions, and climate advisory. |
| KPMG | Audit and advisory, with a strong mid-market and private-enterprise focus. |
They audit most of the NZX 50 and are regulated in NZ for audit quality. Mid-tier firms like BDO and Grant Thornton are growing alternatives for smaller businesses.
A quick look at each: ANZ is the largest, formed from the 2012 merger of ANZ and the National Bank, and often treated as the benchmark for mortgage and savings rates. ASB (founded 1847 as Auckland Savings Bank, owned by CBA) is known for digital innovation and customer satisfaction. BNZ (founded 1861, owned by NAB) is the only big-four bank based in Wellington and focuses on SME and agribusiness lending — see our BNZ guide. And Westpac is a major retail and business bank and the Government’s main banker. For their mortgage and deposit products, our home loan calculator and term deposit rates guide cover how they compare.
Because they dominate market share, capital flow and employment — their combined assets exceed $700 billion, and they hold most of the country’s mortgages, savings and business loans. Part of the reason for this stable structure is Australia’s long-standing “four pillars” policy, which prohibits the four Australian parent banks (CBA, Westpac, NAB and ANZ) from merging with each other — a policy that has effectively locked in the same four-way structure in New Zealand. The Reserve Bank regulates them tightly, requiring each to be locally incorporated (operationally separate from its Australian parent) and to hold high levels of capital so it can absorb losses without a government bailout.
The big four aren’t the only option, and smaller players can be more competitive.
Reference sources
- Reserve Bank of NZ — registered banks and the Depositor Compensation Scheme: rbnz.govt.nz
- Commerce Commission — personal banking services market study: comcom.govt.nz
- Financial Markets Authority — audit quality monitoring: fma.govt.nz
- NZX — the New Zealand share market: nzx.com
The Commerce Commission’s 2024 personal banking market study found that while the big four are safe and stable, their market power has allowed high profitability, and it pushed for measures to make switching easier and to support competitors like Kiwibank. So it pays to compare — see our NZ interest rates guide for the current rate environment, and note that a smaller bank like TSB sometimes offers sharper rates.
The Big Four accounting firms
In the professional-services world, “Big 4” refers to the global networks of Deloitte, PwC, EY and KPMG. They provide audit, tax, consulting and advisory services to most large NZ companies and the government, and audit the vast majority of the NZX 50.
The current living wage
It’s an hourly rate, reviewed each year and announced in April to take effect on 1 September.
- Annual equivalent: about $60,216 a year gross at 40 hours a week (at the $28.95 rate).
- Who sets it: independently calculated by the Family Centre Social Policy Research Unit and released by Living Wage Movement Aotearoa New Zealand.
- Voluntary: it’s not a legal requirement — only accredited employers commit to paying it.
- Scale: around 340 accredited employers, covering more than 64,000 workers.
The rate sits at roughly 68% of average hourly earnings. Confirm the rate in force at livingwage.org.nz.
They operate on a “network” model — each national firm is a separate legal entity that shares the global brand and standards. Their scale, reputation and technology are why a Big 4 signature on a set of financial statements carries weight with investors and international markets. In New Zealand they’re increasingly involved in climate-related disclosures — the mandatory reporting that large financial institutions and listed issuers must now produce — providing independent assurance of that data.
Because they dominate the global audit market, collectively auditing most of the world’s largest listed companies. The name is a legacy of consolidation: the profession went from a “Big Eight” in the 1980s through mergers to a “Big Five,” and then to today’s four after the collapse of Arthur Andersen in 2002.
What’s the biggest company in New Zealand?
A common related question. Among NZX-listed companies, Fisher & Paykel Healthcare is typically the largest by market capitalisation, followed by names like Xero, Meridian Energy and Contact Energy. These aren’t part of either “Big 4,” but they anchor New Zealand’s listed corporate landscape. (If the big-four banks’ NZ subsidiaries were independently listed, they’d rank among the largest companies too.)
Why they matter — and the criticism
Both sets of Big 4 are central to the economy: the banks drive lending and investment, the accounting firms underpin corporate transparency, and together they employ tens of thousands of people and pay significant tax. But their dominance draws criticism too — particularly in banking, where all four parents are Australian-owned, profits flow across the Tasman, and concentration can mean higher fees and less competitive pressure than a more contested market might deliver. The practical takeaway for consumers: the big four are convenient, well-resourced and safe, but they aren’t automatically the best deal — comparing products and considering the NZ-owned alternatives is always worthwhile.
Disclaimer: This article is general information about New Zealand’s major banks and accounting firms, not financial advice, and not a recommendation of any bank, firm or product. Market shares, ownership and company details are approximate and change over time — confirm current details with the institution before you act. Deposit protection under the Depositor Compensation Scheme is subject to eligibility criteria; see the Reserve Bank for details.
Living wage vs minimum wage
| Living wage | Minimum wage | |
|---|---|---|
| Set by | Family Centre (independent) | The Government |
| Based on | The actual cost of living | Government policy decisions |
| Current rate | $28.95/hr ($29.90 from 1 Sep 2026) | $23.95/hr (from 1 Apr 2026) |
| Legal status | Voluntary | Mandatory for most employees |
| Reviewed | Annually, effective 1 September | Annually, effective 1 April |
| Covers | Only accredited employers | Almost all employees aged 16+ |
Frequently asked questions
What are the Big 4 companies in NZ?
“Big 4” usually refers to one of two groups: the four largest banks (ANZ, ASB, BNZ and Westpac) or the four largest accounting and advisory firms (Deloitte, PwC, EY and KPMG). Both dominate their respective industries by revenue, assets and staff.
Which are the biggest banks in New Zealand?
ANZ, ASB, Westpac and BNZ — all subsidiaries of Australian parent banks, collectively holding roughly 85% of New Zealand’s lending and deposits. ANZ is the largest.
Are New Zealand’s banks Australian-owned?
The big four are: ANZ NZ is owned by ANZ Group, ASB by Commonwealth Bank of Australia, BNZ by National Australia Bank, and Westpac NZ by Westpac Banking Corporation. Kiwibank, by contrast, is 100% New Zealand-owned.
Are NZ banks safe?
New Zealand’s banks are considered very stable and are strictly regulated by the Reserve Bank, which requires high capital and liquidity. Since 1 July 2025, deposits have also been protected up to $100,000 per depositor, per bank, under the Depositor Compensation Scheme.
Which are the Big 4 accounting firms?
Deloitte, PwC (PricewaterhouseCoopers), EY (Ernst & Young) and KPMG. They dominate global audit, tax and consulting, and in New Zealand audit most of the NZX 50 and advise major companies and the government.
Is Kiwibank owned by New Zealand?
Yes — Kiwibank is 100% New Zealand-owned. It was established by the government in 2001 as a domestic alternative to the Australian-owned majors and is now the largest challenger to the big four.
What’s the biggest company in New Zealand?
Among NZX-listed companies, Fisher & Paykel Healthcare is usually the largest by market capitalisation. It isn’t part of either “Big 4,” but it’s the biggest of New Zealand’s listed companies.
