Year-by-Year KiwiSaver Projections: A Better Planning Tool

Most KiwiSaver calculators ask you to enter your salary, your contribution rate, and a return assumption - then they project a single lump sum at age 65. That's fine as a rough guide, but real life doesn't work that way.

Your income changes. Your priorities shift. You take time off, change careers, save for a house, go part-time, and eventually retire - all of which affect your contributions along the way. I built the Solid Steele year-by-year projection calculator to handle exactly that.

Why the standard approach falls short

A single-rate calculator assumes your income and contribution rate stay the same from today until the day you turn 65. For most people, that's not even close to accurate.

The year-by-year approach lets you model each stage of your life separately. You can change the income, contribution rate, fund type and employer contribution for any given year. The calculator chains these years together to show a realistic projection based on your actual situation.

It uses official Financial Markets Authority (FMA) capital return assumptions after fees and tax - the same standardised rates used in most regulated projections:

• Defensive: 1.5% per year
• Conservative: 2.5% per year
• Balanced: 3.5% per year
• Growth: 4.5% per year
• Aggressive: 5.5% per year

Six real-life use cases

1. Starting KiwiSaver for your children

If you open a KiwiSaver account for a child from birth and contribute just $20 a week, the projections are striking. Even modest, consistent contributions over 65 years compound into a meaningful retirement balance - and the government member tax credit kicks in from age 16 each year that annual contributions clear $1,042.86.

The calculator lets you model this across the child's entire life: years of small parental contributions, periods of self-contribution once they start working, employer matching, and eventual retirement withdrawals.

2. Apprenticeship years and variable income

Income during an apprenticeship varies significantly - first-year wages are very different from qualified tradesperson rates. The year-by-year approach lets you model lower contributions during training and increasing contributions as income grows.

It also accounts for ESCT (Employer Superannuation Contribution Tax), which changes as income rises. Knowing this helps you plan contribution increases at the right income levels.

3. First home purchase planning

For many New Zealanders, KiwiSaver does double duty - it's both a retirement fund and a first-home deposit. The calculator lets you model:

• Increased contributions in the years leading up to purchase
• A switch to a more conservative fund as the purchase date nears
• The withdrawal event itself - removing most of the balance
• Resuming contributions post-purchase at a lower rate while a mortgage is running

Seeing this mapped year by year shows whether your strategy is realistic and what your retirement balance looks like after factoring in the withdrawal.

4. Parental leave

During parental leave, most people stop or reduce their KiwiSaver contributions. What many don't realise is that even a small voluntary contribution of around $20 per week (~$1,050 per year) is enough to keep earning the government member tax credit of $260.72 annually.

The calculator shows the difference between contributing nothing during leave versus maintaining minimal contributions - and the compounding impact of keeping that government credit flowing through those years.

5. Late-career wind-down

Many people transition to part-time work in their late 50s or early 60s rather than stopping work abruptly. This affects both income and contributions. The calculator lets you model a gradual reduction - perhaps from full-time to 4 days, then 3 days, then eventual retirement - showing how your projected balance changes with each step.

You can also model a fund type change during this period, gradually shifting from a growth-oriented fund to a more conservative one as retirement approaches.

6. Retirement withdrawals

The calculator doesn't stop at age 65. You can model year-by-year withdrawals from your KiwiSaver balance post-retirement - whether that's a regular income supplement, a lump sum for a specific expense like travel, or a one-off payment to clear a remaining mortgage.

This helps you understand how long your balance is likely to last at different withdrawal rates, and whether you need to adjust contributions earlier in life to fund a particular retirement lifestyle.

Why this matters

KiwiSaver is a long-term commitment, and the decisions you make along the way - contribution rates, fund types, voluntary contributions, time out of work, and how you draw down in retirement - compound over decades. Small differences in any one year can mean tens of thousands of dollars at retirement.

Most calculators can't show you that. Mine can.

Sources and further reading

Primary New Zealand sources for the points above. Rules change, so check the current position before acting:

• Sorted KiwiSaver savings calculator - an independent projection to sense-check any figure.
• Inland Revenue - how KiwiSaver works - how contributions and returns build the balance being projected.
• Inland Revenue - getting my KiwiSaver when I retire - what happens at the end of the projection.
• Work and Income - NZ Superannuation - the other income stream most projections sit alongside.

This calculator is designed as an educational tool and should not be treated as personalised financial advice. For advice tailored to your situation, book in a free personalised KiwiSaver Advice Session.