Kernel Wealth Review: Low-Cost Index Investing with New Zealand's Best Digital Experience

Kernel has built the best digital investing platform in New Zealand. The app is clean. The website is fast. The documentation is clear. The management fees start at 0.25% and the NZ$60 annual membership fee is waived for balances under NZ$5,000. For an investor who wants index-based exposure at low cost with a modern interface, Kernel sits alongside Simplicity as the default starting point.

The difference from Simplicity is that Kernel offers more funds — 27 at last count — and a better app experience. The trade-off is that Kernel is a for-profit company, not a non-profit trust. The fees are still low enough that the distinction barely matters at typical balances, but it is a philosophical difference worth noting if the non-profit model appeals to you.

The Funds and Fees

Kernel charges 0.25% to 0.50% per annum depending on the fund. The diversified growth funds — High Growth, Growth, Balanced, Conservative — all sit at 0.25%. The sector-specific funds like US 100, Global Infrastructure, and Global Property are also 0.25%. The more specialised thematic funds — Clean Energy, Global Gender Equality, and the actively-managed options — go up to 0.45% or 0.50%.

The NZ$5 per month membership fee on the Plus tier applies to balances above NZ$5,000. On a NZ$20,000 balance, that works out to 0.30% per year in membership plus the 0.25% fund fee — total 0.55%. On a NZ$100,000 balance, the membership fee drops to 0.06% of the portfolio, bringing total costs to roughly 0.31%. The membership fee becomes less significant as your balance grows, which is the right structure.

The High Growth Fund holds over NZ$530 million in assets under management as at early 2026, with a 5-year annualised return of 14.14% after fees. The fund is 98% growth assets — global shares, some NZ shares, and listed property — with a 2% income allocation. The risk indicator is 5 out of 7 on the FMA-mandated scale. For comparison, the Kernel Growth Fund returned 12.8% over three years and the Balanced Fund returned 5.14%. The fund charges across the Kernel range are among the lowest in New Zealand, competitive with Simplicity at 0.24% for comparable diversified funds.

The Platform Experience

Kernel supports Auto Invest — automated regular contributions at any frequency, which is the mechanism most investors should use to dollar-cost average. Goal tracking is built in, letting you name a goal, set a target amount, and track progress against it. Kids accounts, joint accounts, and trust or company accounts are all supported — useful if you are investing for children or running a family trust.

A cash account paying 2.25% interest is available, functioning as a holding account for uninvested funds. There are no transaction fees on fund orders — only the underlying management fee. US shares and ETFs can be held directly through the platform, though the FX fee applies: 1.5% on the free Starter tier, 0.60% on Plus, and 0.40% on Premium at NZ$15 per month. If you plan to buy US ETFs regularly, the Premium tier saves enough on FX to justify the subscription.

The main limitation is that you cannot buy individual NZ or Australian shares through Kernel. It is a fund platform with US share and ETF access, not a full brokerage. If you want to own Contact Energy or Auckland Airport shares directly, you need a separate brokerage account. This is a genuine limitation for investors who want a single platform for everything.

Who It Suits

Kernel is ideal for someone who wants low-cost index investing with a polished digital experience and the flexibility to choose from a broader fund range than Simplicity offers. The Starter tier works well for small balances. Plus or Premium becomes worthwhile once your balance exceeds NZ$5,000 and you want the lower FX rate for US holdings.

For a balanced portfolio of global index funds, the difference between Kernel at 0.25% and Simplicity at 0.24% is negligible — roughly NZ$2.50 per year on a NZ$10,000 balance. The choice comes down to whether you value Kernel's app and broader fund range or Simplicity's non-profit structure and charity donations more. Both are excellent options. You will not go wrong with either one.

The Caveat: FX for US Holdings

The foreign exchange cost is where Kernel makes its profit. On the free Starter tier, the 1.50% FX fee is high. On a NZ$10,000 US ETF purchase, that is NZ$150. On the Premium tier at 0.40% FX, the same purchase costs NZ$40. If you plan to hold US-listed ETFs — which many Kernel investors will, given the fund range — the Premium tier at NZ$15 per month or NZ$150 per year is worth taking. The FX saving on a single NZ$10,000 trade covers the annual subscription.

For investors using only NZD-denominated Kernel funds, the FX fee never applies. The membership fee is the only ongoing cost beyond the fund management fee, and at NZ$5 per month or NZ$50 per year on the Plus tier, it is modest. The overall cost remains well below the industry average even with the membership fee included.