KiwiSaver vs Savings Calculator
See exactly how employer contributions, the government member tax credit, and compounding make KiwiSaver outperform a savings account — and when the crossover happens.
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How to Use This Calculator
Tab "KiwiSaver vs Savings"
Enter your annual salary, KiwiSaver employee rate, current and retirement ages, and expected return rates. The calculator shows your projected KiwiSaver balance and savings account balance at retirement side by side, the total employer and government contributions you will receive, and the year KiwiSaver first overtakes your savings.
Tab "Year-by-Year"
See a full table of how both balances grow every year. The starred row (★) marks the breakeven year when KiwiSaver pulls ahead of the savings account, even when the savings account is fully accessible and KiwiSaver is locked.
Tab "Contributions"
A detailed breakdown of every dollar going into KiwiSaver versus savings: your own contributions, employer contributions, government member tax credit, and investment growth — so you can see exactly where the advantage comes from.
The Formulas
= Employee contribution + Employer contribution (3.5%) + Govt member tax credit
Employee contribution = Salary × rate (3%–10%)
Employer contribution = Salary × 3.5% (from 1 Apr 2026)
Govt MTC = min(employee contribution × 25%, $260.72)
To maximise the government contribution:
Contribute at least $1,042.86/year of your own money (~$20/week)
Compounding formula (annual):
Balance(year n) = (Balance(year n-1) + Annual contribution) × (1 + return rate)
KiwiSaver advantage at retirement:
= KiwiSaver final balance − Savings final balance
PIE tax vs income tax:
KiwiSaver (PIE fund): max PIR 28%
Savings interest: taxed at marginal income tax rate (up to 39%)
Employer rate sourced from IRD (3.5% from 1 April 2026). Government member tax credit sourced from IRD and KiwiSaver Act 2006.
Example
30-year-old earning $75,000, contributing at 3.5% for 35 years
Assume KiwiSaver return of 6% p.a. and savings account at 4% p.a. Both start at $0.
After 35 years the KiwiSaver balance exceeds the savings account by approximately $200,000–$250,000 depending on actual returns — the gap driven almost entirely by employer contributions and the government member tax credit compounding over time. The breakeven point where KiwiSaver overtakes savings typically occurs within the first 1–3 years, because the employer match is immediate.
KiwiSaver vs Savings: The Trade-offs
KiwiSaver wins on returns for long-term retirement savings. A savings account wins on flexibility. Understanding both matters before deciding how much to put where.
Why KiwiSaver almost always wins for retirement
The core reason is simple: you get two extra sources of money that a savings account cannot match. Your employer is required to contribute at least 3.5% of your salary (from 1 April 2026) into your KiwiSaver account — money you would never receive if you saved outside KiwiSaver. On top of that, the government adds up to $260.72 per year through the member tax credit, matching 50 cents for every dollar you contribute up to $521.44. For a median NZ salary of $75,000, these two sources add roughly $2,900 per year in free money that compounds over your working life.
The liquidity penalty
KiwiSaver's disadvantage is that it is locked until age 65. A savings account is accessible anytime — for emergencies, a car, a home deposit, or any other need. This is a real cost that this calculator does not fully capture: the option value of having money accessible has genuine worth. For this reason, most financial advisers recommend keeping 3–6 months of expenses in a liquid savings account before maximising KiwiSaver contributions.
The PIE tax advantage for higher earners
KiwiSaver funds held in a Portfolio Investment Entity (PIE) are taxed at your Prescribed Investor Rate (PIR), which is capped at 28%. Savings account interest is taxed at your marginal income tax rate — which can reach 39% for income over $180,000 or 33% for income over $70,000. For anyone earning above the 30% tax bracket, KiwiSaver has an additional after-tax return advantage that this calculator does not include. The real KiwiSaver advantage for higher earners is therefore even larger than the headline numbers suggest.
What rate should you choose?
At minimum, contribute enough to receive the full government member tax credit: $1,042.86 per year, which is roughly $20 per week or $87 per month. Beyond that, a higher rate (6%, 8%, 10%) builds retirement wealth faster but reduces take-home pay. The right rate depends on your age, existing savings, and short-term financial goals. If you have high-interest debt, paying that down first may be more valuable than KiwiSaver contributions above 3%–3.5%.
Using KiwiSaver for a first home
After three years of KiwiSaver membership, you can withdraw your employee and employer contributions (not the government member tax credit) toward purchasing your first home. This means KiwiSaver can serve a dual purpose: a first home savings vehicle in the short term, and a retirement fund in the long term. The KiwiSaver First Home Calculator can show you how much you could withdraw.
KiwiSaver fund types
Your KiwiSaver return rate depends heavily on which type of fund you are in:
- Defensive / Cash: lowest risk, ~2–4% p.a. — suitable close to retirement
- Conservative: ~3–5% p.a. — lower volatility
- Balanced: ~5–7% p.a. — typical default for most ages
- Growth: ~6–8% p.a. — higher long-term returns, higher short-term volatility
- Aggressive: ~7–9% p.a. — maximum growth, not suitable near retirement
This calculator defaults to 6% p.a. (balanced fund assumption). If you are in a growth fund and have 20+ years to retirement, a 7–8% assumption may be more realistic. If you are within 5 years of retirement, consider 4–5% for a more conservative projection.
Comparing apples with apples
This calculator uses the same cash outflow for both options: your employee KiwiSaver contribution. If you chose not to be in KiwiSaver, you would not receive the employer contribution (that money stays with your employer) and would not receive the government member tax credit. So the comparison is not "KiwiSaver vs putting the same total amount into savings" — it is "KiwiSaver including free money vs savings with only your own money."
NZ KiwiSaver Quick Reference
| Item | Detail |
|---|---|
| Employee rates available | 3%, 3.5%, 4%, 6%, 8%, 10% |
| Employer minimum (from 1 Apr 2026) | 3.5% of gross salary |
| Govt member tax credit | 25c per $1, max $260.72/year |
| To get max govt contribution | Contribute $1,042.86+/year (~$20/week) |
| MTC period | 1 July – 30 June (paid after 30 June) |
| Normal withdrawal age | 65 (NZ Super eligibility age) |
| First home withdrawal | After 3 years (employee + employer only) |
| PIE tax cap | 28% (vs up to 39% on savings interest) |
| Governing law | KiwiSaver Act 2006 |
| Default provider if not enrolled | IRD-allocated default scheme |