Westpac KiwiSaver is one of New Zealand’s larger bank-affiliated providers, managing funds for a substantial portion of New Zealanders who joined through their employment relationship or Westpac banking. Like most of the major bank providers, Westpac lost its default provider status in the 2021 government review — but continues to serve its existing member base.
This review examines whether Westpac KiwiSaver is worth choosing or staying in during 2026.
Disclosure: MoneyBalance does not have a commercial relationship with Westpac. This review is based on publicly available information and general market knowledge. Always verify current fees, fund details, and performance figures directly with Westpac before making any decision.
For a comparison across providers, see Best KiwiSaver providers NZ (2026).
Westpac KiwiSaver at a Glance
| Detail | Westpac KiwiSaver |
|---|---|
| Type | Bank-affiliated; investment managed by BT Funds Management |
| Default provider status | No — not selected in 2021 government review |
| Funds offered | 6 main funds |
| Management fee (approx) | 0.40%–1.00% depending on fund |
| Member fee | No flat member fee |
| FUM (approx) | $7+ billion |
| Supervisor | Trustees Executors |
| Regulated by | Financial Markets Authority (FMA) |
| Ethical/ESG option | Westpac Ethical KiwiSaver Fund |
Westpac’s Fund Range
Westpac’s KiwiSaver funds are managed by BT Funds Management (NZ) Limited — a subsidiary of Westpac’s broader investment management arm. This is important context: Westpac KiwiSaver is administered by Westpac but the underlying fund management is operated by BT.
| Fund | Approx growth/defensive split | Est. annual fee | Suited to |
|---|---|---|---|
| Cash | 0% / 100% | ~0.40% | Capital preservation |
| Defensive | ~10% / 90% | ~0.55% | Very short horizon |
| Conservative | ~25% / 75% | ~0.65% | 1–5 years to goal |
| Balanced | ~55% / 45% | ~0.80% | 5–15 years |
| Growth | ~80% / 20% | ~0.95% | 15+ years |
| Ethical | ~70% / 30% | ~1.00% | ESG preference, long horizon |
Fees are estimates based on publicly available information. Verify current fees at westpac.co.nz/kiwisaver.
For an overview of what growth and defensive assets mean across these fund types, see KiwiSaver fund types explained.
Westpac KiwiSaver Fees
Westpac’s fees are in a similar range to ANZ’s — the highest band among the big-four bank providers.
Fee comparison — growth fund, $50,000 balance, 10 years (8% gross return):
| Provider | Est. annual fee | 10-year fee cost (est.) |
|---|---|---|
| Low-cost passive (e.g., Simplicity at 0.31%) | 0.31% | ~$2,200 |
| BNZ Growth (~0.50%) | 0.50% | ~$3,500 |
| Westpac Growth (~0.95%) | 0.95% | ~$6,500 |
| ANZ Growth (~1.00%) | 1.00% | ~$6,800 |
At 0.95% for its Growth fund, Westpac sits close to ANZ at the expensive end of bank-affiliated providers, and significantly above BNZ and ASB.
Westpac does not charge a flat annual member fee, which provides a small advantage for members with lower balances.
The BT Funds Management Structure
The fact that BT Funds Management, rather than Westpac itself, manages the underlying investments is worth understanding. BT is a well-established investment manager and provides the same investment infrastructure for Westpac KiwiSaver that it does for Westpac’s other wealth products.
What this means practically:
- Investment decisions are made by BT’s team, not Westpac branch staff
- The fund management is separate from Westpac’s balance sheet
- Your KiwiSaver balance is held in trust, not on Westpac’s books — it would be protected even if Westpac had financial difficulties
For most members, the BT arrangement is invisible — you interact with Westpac’s app and customer service as normal. But it is useful context when comparing the investment management capability of Westpac vs providers who manage funds in-house.
Westpac’s Ethical KiwiSaver Fund
Westpac offers a dedicated Ethical KiwiSaver Fund with a balanced growth/defensive split (approximately 70/30). This fund applies exclusion screens for:
- Fossil fuel extraction and production
- Weapons and armaments
- Tobacco
- Gambling
- Alcohol
The Ethical fund’s fee (~1.00%) is the highest in Westpac’s range — a common pattern where ethical funds carry a small premium over standard funds.
How it compares: For members who want ethical screens within a bank-affiliated provider, both Westpac (dedicated ethical fund) and BNZ (YouChoose overlay on any fund) offer options. Westpac’s approach is a separate fund; BNZ’s is a flexible overlay. Westpac’s ethical fund is a balanced allocation (not growth), which may be a limitation for younger members wanting maximum long-term growth exposure.
For providers with more rigorous ESG integration, see the comparison table in Best KiwiSaver providers NZ.
Default Provider Status — Context for Existing Members
Westpac was not selected in the 2021 default provider review. New employees who have not chosen a KiwiSaver provider after December 2021 are not directed to Westpac. Existing Westpac members are unaffected and can remain indefinitely.
The review’s failure to include Westpac reflects the same factors that excluded ANZ and ASB: fee levels and default fund approach did not meet the new benchmarks for the updated default panel.
Pros and Cons
Pros:
- Dedicated Ethical KiwiSaver Fund for ESG-conscious members
- No flat annual member fee
- Large, stable institution — BT Funds Management provides professional investment management
- Six-fund range including defensive, conservative, balanced, and growth options
- Integrated with Westpac banking (GoMoney app)
Cons:
- Fees (~0.40%–1.00%) are among the highest of the bank providers — comparable to ANZ
- Lost default provider status in 2021
- Ethical fund is balanced-weighted (~70% growth assets), not growth-weighted — limiting for younger members
- Higher fee level not consistently justified by after-fee long-term performance
- No automatic life-stage fund switching
Who Westpac KiwiSaver Suits
Westpac KiwiSaver is a reasonable choice for:
- Westpac banking customers who value bank-KiwiSaver integration
- Members who want a dedicated ethical fund with an established bank provider
- Members who prioritise familiarity and branch access over fee minimisation
Westpac KiwiSaver may not be the best choice for:
- Members focused on maximising their long-term balance — fees at 0.95%–1.00% compound into a significant cost over time
- Members wanting an ethical growth fund (Westpac’s ethical option is balanced, not growth)
- Members comparing the bank options — BNZ and ASB offer lower fees within the bank-affiliated tier
- Self-employed members contributing voluntarily, where fee drag on personal contributions is most noticeable
Switching from Westpac KiwiSaver
The process follows the standard KiwiSaver switching procedure:
- Choose a new provider and apply online
- The new provider arranges the transfer from Westpac
- Balance transfers within approximately 35 days
- Employer contributions redirect automatically
Your years of membership, contribution history, and first home withdrawal eligibility all carry over. The 3-year membership clock does not reset. See the KiwiSaver provider switching guide for details.
Frequently Asked Questions
Is Westpac KiwiSaver good?
Westpac is a reputable provider with a professional investment management arrangement through BT Funds Management. However, its fees are among the highest of the bank providers and it did not pass the 2021 default review. For most members, BNZ and ASB offer better value within the bank-affiliated tier.
What is BT Funds Management and is my money safe?
BT Funds Management (NZ) is Westpac’s investment management subsidiary. Your KiwiSaver balance is held in a trust supervised by Trustees Executors and regulated by the FMA — it is separate from Westpac’s own balance sheet and would be protected in the event of Westpac financial difficulties.
Is Westpac’s Ethical Fund worth the higher fee?
The Ethical fund’s ~1.00% fee is Westpac’s highest, and its balanced (not growth) allocation limits long-term return potential for younger members. For a better ethical option with lower fees and a growth allocation, compare providers like Pathfinder or Booster’s socially responsible option.
Can I be with Westpac KiwiSaver if I do not bank with Westpac?
Yes. KiwiSaver provider and bank are entirely independent. You can have KiwiSaver with Westpac while banking with any other institution.
What fund am I in by default with Westpac?
If you have never selected a fund, Westpac’s default allocation is typically the Balanced fund. Check the GoMoney app or contact Westpac to confirm your current fund.
Key Takeaways
- Westpac KiwiSaver is managed by BT Funds Management — a professional, dedicated investment arm
- Fees of approximately 0.40%–1.00% are at the expensive end of bank-affiliated providers
- Not a default provider as of the 2021 government review
- The Ethical KiwiSaver Fund provides ESG screens but is balanced-weighted, not growth-weighted
- Among the bank-affiliated providers, BNZ and ASB offer lower fees — worth comparing before committing to Westpac
- Members with large balances should assess whether the fee gap from passive providers (0.31% vs 0.95%) justifies staying
For a full comparison across NZ’s top providers, see Best KiwiSaver providers NZ (2026) and how to choose a KiwiSaver fund.