Kernel vs Simplicity Index Funds in NZ (2026): Which Low-Fee Builder Wins?

Kernel and Simplicity are New Zealand's two low-fee index leaders. Here is how their index methodology, hedging, all-in costs and KiwiSaver vs investment-fund options actually compare for NZ investors.

This article is general information only and is not personalised financial advice. It does not take into account your particular financial situation, goals or needs. Before acting, consider whether it's right for you and seek advice tailored to your circumstances.

Kernel and Simplicity are New Zealand's two best-known low-fee index fund managers, and most people compare them on their KiwiSaver schemes. But both also run ordinary (non-KiwiSaver) investment funds, and that is where the real differences between their approaches show up. One is built for people who want to assemble and tilt their own portfolio; the other for people who want a ready-made one they never have to touch.

This guide compares them on how they build their index funds, which markets they track, all-in costs, currency hedging, their investment-fund ranges, and who each one suits. There is no "winner" that fits everyone — the right answer depends on how hands-on you want to be.

TL;DR: Kernel vs Simplicity index funds at a glance

TL;DR: Both are low-fee passive index managers. Kernel charges a flat 0.25% p.a. on its core index funds (0.45% on specialty funds) and lets you build your own portfolio from single-market funds, with hedged and unhedged share classes ¹²⁶. Simplicity charges 0.29% p.a. on its diversified investment funds (later reduced) and as little as 0.10–0.15% p.a. on its single-sector NZ and global funds, set up as ready-made or building-block options ³⁴. Pick Kernel to build and tilt; pick Simplicity for a ready-made, not-for-profit-run portfolio.

How do Kernel and Simplicity build their index funds differently?

Both are passive managers — neither tries to pick winning shares. They buy a defined index of the market and aim to track it as cheaply as possible. The difference is in how they package that for you.

Kernel is built as a kit of parts. It offers a menu of single-market and single-theme index funds — an S&P 500 fund, an NZ 50 fund, a Global 100 fund, sector and specialty funds — and expects you to choose which ones you hold and in what proportions ⁶. That gives engaged investors a lot of control, including the ability to run a deliberate tilt (more US, more NZ property, an ESG slant) that a ready-made portfolio cannot give you.

Simplicity is built around ready-made diversified portfolios. Its Defensive, Conservative, Balanced, Growth and High Growth funds are each a complete, globally diversified mix with a set growth/income split, all at one management fee ³. You pick one fund that matches your timeframe and risk tolerance, and there is nothing further to assemble or rebalance. Simplicity also offers single-sector funds (NZ Share, NZ Bond, NZ Cash, Global Share, Global Bond) for people who want building blocks, but the diversified funds are its main offering ⁴.

A structural point some investors weigh: Simplicity is a non-profit manager that returns 15% of its management-fee revenue to the Simplicity Foundation for charity, whereas Kernel is a for-profit business ⁵. Neither model is "better" — but they justify their fees in different ways under the FMA's value-for-money expectations ⁵⁸.

Which indices and markets does each actually track?

This is where "index fund" stops being one thing. The label only tells you the fund tracks an index — not which one, or how much of the world it covers.

Kernel's single-market funds each track a specific, named index — for example a US large-cap index (S&P 500), a global mega-cap index (Global 100), and NZ-share indices. Because you hold these individually, your overall market exposure is whatever combination you build. If you only buy the S&P 500 fund, your portfolio is entirely US large-caps, with no NZ shares, no bonds and no diversification beyond that one market.

Simplicity's diversified funds spread across global and local shares and bonds inside a single fund, so a Balanced or Growth fund already holds many markets at once. Its single-sector funds, by contrast, each track one slice — NZ shares, NZ bonds, global shares or global bonds — so you would combine several to get a diversified result ⁴.

The practical takeaway: with Simplicity's diversified funds the diversification decision is made for you; with Kernel (and with Simplicity's single-sector range) it is your job. Concentrating in one market can do better or worse than a diversified mix, and it carries more short-term ups and downs. Returns are not guaranteed and the value of investments can go down as well as up.

What are the all-in costs once you include fund and account fees?

Cost is where these two are closest, and where both leave the banks and active managers behind. The figures below are the management/fund fees; check each provider's current Product Disclosure Statement for the live numbers, as fees change.

Two things stand out. First, on a single diversified holding, Kernel's 0.25% core fee is marginally below Simplicity's 0.29% — though Simplicity has since reduced this further (to 0.24% effective 1 September 2025) ³. A 0.04% difference is roughly $12 a year on a $30,000 balance — too small to decide on.

Second, the cheaper option flips when you go single-sector. Simplicity's NZ single-sector funds at 0.10% and global funds at 0.15% are cheaper than Kernel's specialty funds at 0.45% ²⁴. So a self-built portfolio can end up cheaper with Simplicity's building blocks, while Kernel's specialty (thematic) tilts cost more and lift your blended fee above its 0.25% core rate ².

For context against the rest of the market: Sorted's Smart Investor tool reports the average aggressive/growth KiwiSaver fund's total fees at roughly 0.90% p.a. — about $269 on a $30,000 balance — versus 0.25% for a comparable Kernel index fund ⁷. Index funds in NZ typically charge well below 1% per year, a fraction of typical active-manager fees ⁹. You can compare any two funds on the same after-fees-and-tax basis using the free Smart Investor tool, and there is more detail in our guide to KiwiSaver returns after fees and tax.

How do their currency hedging choices affect your returns?

This is an underrated difference, and it matters more than the fee gap for anyone holding global shares.

When a NZ investor owns overseas shares, returns come from two things: how the shares perform, and how the NZ dollar moves against the relevant overseas currency. "Hedging" is the manager neutralising that currency movement so you mostly get the share return; "unhedged" leaves you exposed to currency swings, which can add to or subtract from your return.

Kernel offers both hedged and unhedged versions of many global funds — for example a Global 100 and a Global 100 (NZD Hedged), and an S&P 500 Unhedged and an S&P 500 (NZD Hedged) ⁶. That lets a hands-on investor choose their currency exposure deliberately, or split across both.

Simplicity applies a fixed internal hedging policy set by the manager inside its diversified funds, so the currency decision is made for you ⁶. (Its single-sector global range does include hedged and unhedged options, but the headline diversified funds use the manager's set policy.)

Neither approach is universally right. Hedging reduces currency volatility but costs a little and can hurt when the NZ dollar falls; staying unhedged can help or hurt depending on the currency. The point is that Kernel hands you the choice, while Simplicity makes a sensible default choice on your behalf. If you do not have a clear view on currency, a managed default is often the more sensible path — getting hedging "wrong" by guessing is a real risk.

How do their non-KiwiSaver investment funds compare?

Both run ordinary investment funds outside KiwiSaver, which suit money you may want to access before 65 — a house deposit beyond the KiwiSaver scheme, a medium-term goal, or general long-term investing.

Kernel's investment funds mirror its KiwiSaver menu: the same single-market and specialty index funds, the same hedged/unhedged choices, at the same core 0.25% and specialty 0.45% fees ¹²⁶. So the build-your-own approach carries straight across.

Simplicity's investment funds mirror its diversified KiwiSaver range — the same Defensive through High Growth funds — plus the cheaper single-sector NZ and global funds for people who want building blocks ³⁴. There are no entry, exit or transaction fees ⁴.

The same logic applies as with KiwiSaver: Simplicity is the simpler ready-made option, Kernel the flexible builder. Outside KiwiSaver, tax is handled through the PIE (Portfolio Investment Entity) regime and your PIR (Prescribed Investor Rate — the tax rate on your fund earnings, based on your income). Getting your PIR right matters for after-tax returns regardless of which provider you choose.

Can you mix single-sector Kernel funds to beat a diversified Simplicity fund?

You can certainly build a diversified portfolio out of Kernel's single-market funds — say a global share fund, an NZ share fund and a bond fund in chosen proportions. Whether it "beats" a ready-made Simplicity fund is a different question, and not one anyone can promise.

There are three things to weigh honestly:

• Cost. A core-only Kernel mix stays near 0.25%. Adding specialty (0.45%) funds lifts your blended fee ². Simplicity's single-sector building blocks (0.10–0.15%) can actually be cheaper than a Kernel build ⁴.
• Effort and discipline. A self-built portfolio needs you to choose the allocation, rebalance over time, and resist chasing whichever market did best last year. Some people do this well; others quietly drift and underperform a left-alone diversified fund.
• Diversification. A ready-made fund's whole job is to be diversified for you. A DIY mix is only as diversified as you make it.

So the honest answer is: a well-built, low-cost Kernel mix can match or differ from a diversified Simplicity fund, but the deciding factor is usually your own discipline, not the products. Returns are not guaranteed and past performance is not a reliable indicator of future performance. For most people, a single well-diversified fund left alone is the more reliable path; the build-your-own route rewards genuine engagement.

Which platform suits a hands-off vs a hands-on index investor?

A simple way to settle this is to ask which kind of investor you are.

For most people the fee gap is too small to decide on, so the choice comes down to ready-made versus build-your-own. That single question settles it faster than any cost comparison.

How does this differ from the KiwiSaver-only decision?

If you are only choosing a KiwiSaver scheme, the comparison narrows. KiwiSaver locks your money until 65 (with set exceptions like a first-home withdrawal), and the rules — government contribution, withdrawal eligibility, PIR tax — are set by the Government and apply equally whichever provider you pick. So the KiwiSaver-only decision is mostly about fund range, fees and fit, which we cover in our dedicated Simplicity vs Kernel KiwiSaver guide.

The investment-fund decision in this article adds two extra levers: access (your money is not locked until 65) and currency hedging choice (more visible in Kernel's standalone funds). Many people use both — KiwiSaver for retirement, an investment fund for goals before 65 — and the two need not be with the same provider, though keeping them together can simplify admin.

For background on why the passive approach underpins both, see active vs passive KiwiSaver, and for the wider low-fee field see our roundup of low-fee KiwiSaver providers in NZ.

Frequently asked questions

Is Kernel or Simplicity cheaper for index funds? It depends on what you hold. On a single diversified fund the two are within a few hundredths of a percent — Kernel's 0.25% core fee against Simplicity's 0.29% (later 0.24%) ¹³. But Simplicity's single-sector funds (0.10% NZ, 0.15% global) undercut Kernel's specialty funds at 0.45% ²⁴. A build-your-own portfolio can be cheaper with Simplicity's blocks; a single core fund is marginally cheaper with Kernel.

Can I choose hedged or unhedged global funds? With Kernel, yes — it offers hedged and unhedged versions of many global funds, such as Global 100 and S&P 500 ⁶. Simplicity applies a fixed internal hedging policy inside its diversified funds, so that decision is made for you ⁶. Neither approach is automatically better; it depends on whether you want to control currency exposure yourself.

Are these funds index (passive) funds? Yes. Both Kernel and Simplicity are passive index managers that track defined market indices rather than trying to pick winning shares ⁶. NZ index funds typically charge well below 1% per year, a fraction of typical active-manager fees, and you can compare them on Sorted's Smart Investor tool ⁷⁹.

Can I build a diversified portfolio from Kernel's single funds? You can combine Kernel's single-market funds into a diversified mix, but you take on the allocation and rebalancing yourself ⁶. A ready-made Simplicity diversified fund does that work for you. Whether a self-built mix performs better is not guaranteed and usually comes down to your own discipline rather than the products.

Do both offer investment funds outside KiwiSaver? Yes. Both run ordinary (non-KiwiSaver) investment funds that you can access before 65, taxed through the PIE regime at your PIR ³⁴⁶. Kernel's mirror its single-market menu; Simplicity's mirror its diversified range plus single-sector building blocks.

How do I compare them on the same basis? Use the Retirement Commission's free Smart Investor tool, which shows funds after fees and tax on a consistent basis ⁷⁹. The FMA's value-for-money guidance also expects providers to justify their fees by the returns and services delivered, which supports comparing low-cost index funds directly ⁸.

This article is general information only and is not personalised financial advice. It does not take into account your particular financial situation, goals or needs. Before acting, consider whether it's right for you and seek advice tailored to your circumstances. Returns are not guaranteed. The value of investments can go down as well as up and you may get back less than you invested. Past performance is not a reliable indicator of future performance. Figures are correct as at 13 January 2025 — check current rules and fees at each provider's Product Disclosure Statement, ird.govt.nz and sorted.org.nz. Craig Smith Business Services Ltd (FSP712931), trading as Smiths Financial, holds a Class 2 licence issued by the Financial Markets Authority to provide financial advice on personal risk insurance, health insurance, general insurance, KiwiSaver and managed funds, and is a member of the Financial Dispute Resolution Service (FDRS), a free and independent dispute resolution scheme. We're generally paid by commission from the provider when you take out a product through us; this doesn't change the price you pay, and we manage any conflicts in line with our duty to prioritise your interests. Written by Henry Smith, Financial Adviser; reviewed by Craig Smith, Principal Adviser. Last reviewed 13 January 2025.