Retirement Savings Shortfall Calculator NZ 2026/27

Quick answer: Your shortfall is your target retirement number minus your KiwiSaver or savings balance projected forward at your expected return. In the worked example below, a $70,000 earner aged 35 with $25,000 saved, targeting $903,305 at age 65 on a 4.5% Growth fund return, is projected to reach $408,473, a shortfall of $494,832, closed by an extra $675.92 a month. Enter your own numbers below.

This retirement savings shortfall calculator answers the question every KiwiSaver member eventually asks: am I actually going to get there? It takes your current balance, your age, your salary, and your own and employer contribution rates, then projects the whole lot forward to your chosen retirement age using an expected annual return, compounding each year's contribution for however long it has left to grow. That projected balance is then compared against a target retirement number, either one you already have in mind or the default figure used here, which matches the worked example on our Retirement Number Calculator. Where the projection falls short of the target, the calculator works out the extra monthly contribution, on top of what you are already putting in, needed to close that exact gap by retirement. Where the projection already meets or beats the target, it shows the surplus instead and confirms no extra top-up is needed. Along the way it applies the actual New Zealand KiwiSaver government contribution rules, including the $260.72 annual cap, the $1,042.86 of own contributions needed to reach it, and the removal of the government contribution above $180,000 income. This is built for anyone with a KiwiSaver account or other regular savings plan who wants a concrete top-up figure rather than a vague sense that they should be saving more, and it works equally well for someone decades from retirement setting a long-run habit or someone within 10 to 15 years wanting a realistic, numbers-based check.

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Updated  Current rates and legislation applied.
Verification & Methodology
KiwiSaver contribution rates: employee and employer default to 3.5% each, the minimum rate from 1 April 2026, read from the site's central rate file paye-data.js (KIWISAVER_DEFAULT_RATE, KIWISAVER_EMPLOYER_DEFAULT).
Government contribution: 25 cents per $1 of your own contributions, capped at $260.72 a year (needing $1,042.86 of own contributions), removed entirely above $180,000 income from 1 July 2025. Calculated with the kiwisaverGovtContribution() function in paye-data.js.
Expected return options: Conservative 2.5%, Balanced 3.5%, Growth 4.5%, Aggressive 5.5% a year, net of fees and after a 28% prescribed investor rate. These are general planning assumptions in line with published FMA/Sorted return ranges, not a forecast for any specific fund or provider.
Method: Projected balance = balance × (1+r)^n + annual contribution × ((1+r)^n − 1) ÷ r, where n is years to your chosen retirement age. Extra annual contribution needed = shortfall × r ÷ ((1+r)^n − 1), divided by 12 for a monthly figure.
Last verified: July 2026, against Inland Revenue KiwiSaver guidance and published FMA/Sorted fund return ranges.
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$494,832
shortfall vs your $903,305 target at age 65
Target retirement number$903,305
Projected balance at retirement$408,473
Extra needed per month$675.92
Years until retirement30
Total contributions over that time$179,822
Investment growth$228,652

Projected balance = balance × (1+r)^n + annual contribution × ((1+r)^n − 1) ÷ r. A planning estimate only: it assumes a constant annual return and steady contributions, and does not model market volatility, sequence-of-return risk, inflation, or tax on withdrawal.

Next step: If there is a gap, the fastest lever is usually your own contribution rate. Ask your payroll team or KiwiSaver provider how to lift it, or set up a regular voluntary top-up for the extra monthly amount shown above. It is also worth checking that your fund type still matches your time horizon, since a Conservative fund decades from retirement can quietly cost you tens of thousands of dollars in forgone growth, and confirming that provider fees are not eating into your return using our KiwiSaver Fee Impact Over 30 Years Calculator. If you are not sure what your target retirement number should be in the first place, start with our Retirement Number Calculator, or compare fund options directly using the free Sorted KiwiSaver Fund Finder.

How this calculator works

The projection side of this calculator uses the same standard compounding formula as our KiwiSaver Retirement Projection Calculator. Your current balance grows at your expected return for every year remaining until retirement, and each year's contribution, made up of your own KiwiSaver rate, your employer's matching rate, and the government contribution, also compounds for however many years it has left in the fund. Written out, the projected balance equals your balance multiplied by (1 plus the return rate) to the power of the years remaining, plus your annual contribution multiplied by ((1 plus the return rate) to the power of the years remaining, minus 1), divided by the return rate. Subtracting that projected balance from your target retirement number gives the shortfall, or a negative number if you are already ahead. Where there is a shortfall, the calculator rearranges the same compounding formula to solve for the extra annual contribution that would close the gap by retirement, then divides by 12 for a monthly figure. That extra contribution is assumed to earn the same return as your existing savings and to be made every year from now until retirement, not as a single lump sum.

The KiwiSaver government contribution, applied automatically

New Zealand's KiwiSaver government contribution adds 25 cents for every dollar of your own contributions, up to a maximum of $260.72 in the year to 30 June, which requires $1,042.86 of your own contributions to reach in full. On a $70,000 salary at the default 3.5% employee rate, your own contribution is $2,450 a year, comfortably over the $1,042.86 needed, so the full $260.72 applies. From 1 July 2025 the government contribution is removed entirely for members with income over $180,000 in the relevant year, regardless of how much they contribute. The calculator works all of this out from your salary and contribution rate automatically, so you do not need to look up or enter the government contribution yourself.

Choosing a realistic fund return

The return you assume matters enormously over a multi-decade projection, which is why the calculator offers four fund types rather than a single figure. As a general planning guide, net of fees and after a 28% prescribed investor rate, Conservative or Defensive funds average around 2.5% a year, Balanced funds around 3.5%, Growth funds around 4.5%, and Aggressive funds around 5.5%. On the $25,000 balance and $5,160.72 annual contribution used in the worked example below, over 30 years those four assumptions alone produce projected balances of roughly $279,000, $337,000, $408,000 and $498,000 respectively, a spread of well over $200,000 from the fund type decision alone. These figures are broad, published planning ranges, not a forecast for any specific provider or fund, and actual returns in any given year can be well above or below the long-run average.

Worked example

Take someone aged 35, planning to retire at 65, so 30 years remain. They have $25,000 already saved and earn $70,000 a year, contributing the default 3.5% themselves with a 3.5% employer match. Their own contribution is $2,450 a year, which is over the $1,042.86 needed for the full government contribution, so $260.72 is added on top, making $5,160.72 in total contributions each year. Choosing a Growth fund at an assumed 4.5% return, the projected balance at 65 comes to $408,473, made up of $179,822 in total contributions (the starting balance plus 30 years of annual contributions) and $228,652 of investment growth. Against a target retirement number of $903,305, that leaves a shortfall of $494,832. Solving the compounding formula for the extra annual contribution needed to close that exact gap over the remaining 30 years gives $8,111.05 a year, or $675.92 a month, on top of the $5,160.72 already going in. Putting in that extra amount every year from now, at the same 4.5% assumed return, would be expected to bring the projected balance up to the full $903,305 target by age 65.

What if you are already on track

Not every result is a shortfall. If your current balance and contribution rate are already projected to meet or beat your target, the calculator shows a surplus rather than a gap, and the extra monthly contribution needed drops to $0. This is a genuinely useful result on its own: it means your current settings are, on paper, consistent with your goal, and you may want to use the spare capacity for other priorities, such as paying down debt, building an emergency fund outside KiwiSaver, or simply confirming the result holds if you assumed a slightly more cautious return.

What this calculator assumes

  • A constant annual return and steady, unchanging contribution rates every year from now until your chosen retirement age. Real investment returns vary year to year, and most people's income and contribution rate also change over a working life.
  • Any extra top-up contribution is assumed to start immediately and continue every year until retirement, earning the same return as your existing balance. It does not model a one-off lump sum instead.
  • The government contribution rules current from 1 July 2025: 25 cents per $1 of your own contributions, capped at $260.72 a year, removed entirely above $180,000 income.
  • Figures are not adjusted for inflation. If your target retirement number is in today's dollars, the actual balance you need to accumulate by retirement may need to be larger again over a long horizon.
  • Results are shown before tax on withdrawal and do not include KiwiSaver or investment fees beyond what is already netted off inside the expected return you select.

Who this calculator is for

This is for anyone with a KiwiSaver account, or any other regular savings or investment plan, who wants an honest, numbers-based answer to whether their current contributions are enough. It suits people early in their working life who want to set a sustainable long-run contribution habit, people within 10 to 15 years of retirement who want to know exactly how much more to put in if they are behind, and anyone who has already worked out a target retirement number and now wants to check their KiwiSaver is actually tracking towards it. If you have not yet set a target, start with our Retirement Number Calculator first, then bring the number here.

Frequently Asked Questions about your retirement savings shortfall

What is a retirement savings shortfall?

The gap between the nest egg you are on track for, based on your current balance and contributions, and the nest egg you actually need for your target retirement income. It is your target retirement number minus your projected balance at retirement.

How is the extra monthly contribution worked out?

The calculator solves the future value of annuity formula for the extra annual contribution required, given the years remaining and your expected return, then divides by 12. In formula terms, extra annual contribution equals the shortfall multiplied by the return rate, divided by ((1 plus the return rate) to the power of the years remaining, minus 1).

Where does the target retirement number come from?

You can enter your own directly. If you are not sure what yours should be, use our Retirement Number Calculator, which works out a target from your desired annual income in retirement, NZ Superannuation, and a safe withdrawal rate. The default of $903,305 here matches that calculator's own worked example.

Does this include the KiwiSaver government contribution?

Yes. The government contributes 25 cents per $1 of your own contributions, up to $260.72 a year, needing $1,042.86 of own contributions to reach in full, removed above $180,000 income from 1 July 2025. The calculator applies all three rules automatically from your salary and contribution rate.

What return should I use for my KiwiSaver fund?

Use a realistic long-run figure net of fees and tax. As a general guide, Conservative or Defensive funds average around 2.5% a year, Balanced around 3.5%, Growth around 4.5%, and Aggressive around 5.5%, net of fees and after a 28% prescribed investor rate. These are broad planning assumptions, not a forecast for any specific fund.

What if I am already on track and there is no shortfall?

The calculator shows a surplus instead of a shortfall, and the extra monthly contribution needed is $0. It does not guarantee the outcome, since it still depends on your assumed return being achieved, but it means your current settings are consistent with reaching your goal on paper.

Does this calculator account for inflation?

No. The projected balance and the target retirement number are treated as being in the same set of dollars, so the comparison is fair, but neither figure is separately adjusted for inflation. If your target is in today's dollars, the actual balance needed by retirement may be larger again over a long horizon.

Can I use this for savings outside KiwiSaver?

Yes. Set the employer contribution rate to 0% if there is no employer match, and use the salary and contribution rate fields to represent your own regular savings amount. The government contribution only applies to KiwiSaver, so it will be $0 for non-KiwiSaver savings entered this way.

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Official NZ sources

This calculator is built from primary New Zealand sources. Always confirm current figures against the official source for your situation: