KiwiSaver Fee Impact Over 30 Years
A 0.7-percentage-point gap in annual KiwiSaver fees doesn't sound like much. Over 30 years of compounding on a typical NZ salary, it can mean a difference of tens of thousands in your final balance. We modelled three real-world fee tiers — 0.3% (passive index), 0.66% (NZ market median), 1.0% (high-fee active) — to show the full impact, after PIR.
30-year projection at three fee tiers
| Fee tier | Annual fee | Net return after fee | Final balance (30 yrs) | Total fees paid | vs cheapest tier |
|---|---|---|---|---|---|
| Passive index (cheapest) | 0.30% | 5.70% | $257,888 | $9,332 | — |
| NZ median fund | 0.66% | 5.34% | $246,354 | $19,935 | −$11,535 |
| High-fee active | 1.00% | 5.00% | $236,004 | $29,384 | −$21,884 |
Assumptions: $80,000 salary, 3% employee + 3% employer (post-30% ESCT), 6% gross return, 28% PIR, $260.72 Member Tax Credit annually, 30 years, no salary inflation. Fees compound annually on the running balance before PIR is applied to net return.
Why the gap is bigger than it looks
It's tempting to assume a 0.7% annual fee gap costs you 0.7% × 30 = 21% over 30 years. The actual impact is larger because:
- Fees compound against your largest balance. The dollar amount you pay in fees is biggest in years 25–30, when your balance is highest.
- Each year's fee reduces the base for next year's growth. A 1% fee in year 1 takes $X off the balance — and that $X is no longer compounding for 29 more years.
- PIR is applied to net (post-fee) return. Fees aren't tax-deductible inside a PIE — you pay the full fee in pre-tax dollars, which makes the after-tax cost effectively higher.
Methodology
We modelled annual contributions deposited at year-start, gross return earned over the year, fees deducted from gross return, then PIR applied to net return. Member Tax Credit added each 30 June (government year-end). 30-year horizon reflects a 35-year-old contributing until 65.
Real returns will diverge — markets aren't smooth, salaries grow, contribution rates change, and the May 2025 Budget halved the Member Tax Credit from $521.43 to $260.72. The model shows the relative impact of fees holding everything else constant — the conclusion (lower fees = much more money) is robust to most assumption changes.
What to do with this
- Find your fund's total expense ratio in your latest annual statement or on Sorted FundFinder.
- If you're above 0.7%, look at the lower-fee passive funds available in your provider's lineup or consider switching providers.
- Don't move on past performance alone — the empirical evidence (S&P SPIVA, IRD KiwiSaver disclosure) is that fee level predicts net long-term returns far better than any other published metric.
- Run your specific scenario in our KiwiSaver Retirement Projector.
Frequently asked questions
Where did the 0.3% / 0.66% / 1.0% fee tiers come from?
0.3% reflects the cheapest passive index KiwiSaver funds available in NZ (e.g. Simplicity, Kernel). 0.66% is the median KiwiSaver expense ratio per FundFinder data (mid-2025 snapshot). 1.0% reflects active default funds at the higher end of the market. Fees are applied to the fund balance annually before PIR taxation.
What assumptions does the projection use?
$80,000 income, employee 3% + employer 3% (after 30% ESCT), 6% gross annual return, 28% PIR, $260.72 Member Tax Credit (post-Budget-2025 rate from 1 July 2025), and 30 years of consistent contribution. No salary inflation, no contribution holiday, no employer top-up changes.
Why does a 0.7-percentage-point fee gap matter so much?
Compounding works on net-of-fee returns. A 0.7-point fee drag on a 30-year horizon doesn't just mean 0.7% × 30 = 21% less. The fee compounds against the un-grown balance every year. Over 30 years at 6% gross, dropping fee from 1.0% to 0.3% can lift final balance by ~12% — tens of thousands of dollars on a $80k salary.
Does this account for tax (PIR)?
Yes. Fees are deducted from gross return before PIR is applied, which is how PIE funds work in NZ. The 28% PIR is applied to net (post-fee) return each year. PIR top-ups for higher-income earners are not modelled — those would slightly reduce all balances proportionally but not change the rank order.
What about active funds beating passive?
S&P SPIVA data and IRD's own KiwiSaver disclosure data consistently show that the median active KiwiSaver fund underperforms its index over 5+ years after fees. A small minority of active managers do beat — but you can't reliably pick them in advance. The conservative assumption (same gross return, different fee) is friendlier to active than the empirical evidence.
How do I find my KiwiSaver fund's fee?
Check your annual KiwiSaver statement (sent each June) for the 'fund charges' line, or look up your fund in Sorted's FundFinder. The number to focus on is the total expense ratio — management fee + admin fee + performance fees, expressed as a percentage of your balance.