KiwiSaver Retirement Income Calculator

How KiwiSaver Retirement Income Works in New Zealand

The KiwiSaver Retirement Income Calculator projects how much income your KiwiSaver account will generate once you reach retirement at age 65. Unlike Australian superannuation, New Zealand has no mandatory drawdown rules — you can take your balance as a full lump sum, make gradual withdrawals at any pace, or leave it invested indefinitely. This flexibility makes it important to model your own drawdown strategy rather than relying on a one-size-fits-all figure.

This calculator uses the 4% rule as a baseline for sustainable withdrawals. Applied to your projected balance at retirement, 4% gives you an annual KiwiSaver income that should, in theory, sustain your portfolio for 30 or more years depending on investment returns. The tool then adds your NZ Super entitlement — NZD $496.36 per week (NZD $25,811/year) for a single person living alone in 2025-26 — to show your total combined monthly retirement income. NZ Super is paid to all eligible NZ residents from age 65 regardless of savings history.

Your projected balance at retirement is calculated using compound growth on your current balance, plus annual contributions from yourself, your employer, and the government MTC (member tax credit), all compounding at your chosen fund's return rate across the years until retirement.

Choosing a KiwiSaver Fund for Retirement Planning

Fund selection is the single biggest lever for long-term KiwiSaver growth, ahead of even contribution rate for younger members. A growth fund targeting 8% annual returns compounded over 30 years on a NZD $20,000 balance with regular contributions produces dramatically more than a conservative fund at 4% — the difference can easily exceed NZD $300,000–$500,000 on an average salary. The trade-off is short-term volatility: growth funds can drop 20–30% in a bad year, which matters enormously if you retire at the bottom of a market cycle.

The widely used rule of thumb is to be in growth until at least 10 years before retirement, then switch to balanced, then conservative in the 5 years before you plan to stop working. Many KiwiSaver providers offer lifecycle or target-date funds that do this switching automatically based on your age. These are sensible for hands-off investors, though active switchers can often optimise their timing using market valuations. Use this calculator to compare all three scenarios and see the difference in projected retirement income across Conservative, Balanced, and Growth assumptions.

NZ Super and the Combined Retirement Income Picture

New Zealand Superannuation is available to all eligible NZ residents from age 65 regardless of how much KiwiSaver they have accumulated. For the 2025-26 year, the after-tax weekly rate for a single person living alone is NZD $496.36 — approximately NZD $2,151 per month or NZD $25,811 per year. Couples receive a lower combined per-person rate. NZ Super alone sits above the poverty line but well below what most people consider a comfortable retirement income, making KiwiSaver a critical supplement.

For a rough benchmark: Massey University's NZ Retirement Expenditure Guidelines suggest a comfortable (not lavish) city retirement for a single person costs approximately NZD $42,000–$48,000 per year. After NZ Super covers NZD $25,811, you need approximately NZD $16,000–$22,000/year from KiwiSaver — which at the 4% rule requires a retirement balance of NZD $400,000–$550,000. This calculator shows exactly whether your projected balance meets that gap, and what actions (higher contributions, longer working years, fund switching) can close a shortfall.

Understanding the 4% Withdrawal Rule

The 4% rule — also called the Bengen Rule — originated from a 1994 study of US stock and bond portfolio survival rates. It suggests that withdrawing 4% of your starting retirement balance per year, adjusted annually for inflation, should sustain a balanced portfolio for at least 30 years. While originally derived from US data, the principle is widely applied in New Zealand retirement planning as a practical starting point.

For KiwiSaver, the 4% rule works differently because you are not constrained to a specific schedule. You can draw more in early active retirement years when travel and lifestyle costs are higher, and draw less in later years. The longevity table in this calculator shows how long your balance would last at 3%, 4%, and 5% annual withdrawal rates, assuming a 5% average investment return during drawdown. This helps you understand the trade-offs between higher income now versus making your savings last longer. As a general guide: if your KiwiSaver lasts to age 90 or beyond under the 4% rule, you are in a strong retirement position.