It’s important to know exactly how much you will need to retire into the lifestyle you choose. Having a goal gives you direction and keeps you focussed, enabling you to track progress.
The answer will vary depending upon many factors such as your intended level of lifestyle, where you live and so on. Let’s take a look — what the math says, what it means for real life in New Zealand, and how to figure out your personal number.
Start With the 25x Rule
The foundation of FIRE planning is the 25x rule. It’s simple: multiply your expected annual spending in retirement by 25, and that’s roughly how much you need invested.
So if you plan to spend $60,000 a year in retirement, you need $1.5 million. If you want $80,000 a year, you’re looking at $2 million.
The 25x rule comes from the 4% withdrawal rate — the idea that you can safely withdraw 4% of your portfolio each year without running out of money over a 30-year retirement. It’s based on decades of US market data and is widely used as a starting point in FIRE planning.
Of course, to work this out, you need to know what your expenses are likely to be.
What Does Retirement Actually Cost in New Zealand?
Before you can calculate your number, you need an honest picture of what you’ll spend.
Massey University’s Fin-Ed Centre publishes annual Retirement Expenditure Guidelines (REGs) for New Zealand. Their 2025 figures give us a useful benchmark:
| Lifestyle | Single (Metro) | Couple (Metro) |
| No frills | ~$705/week | ~$970/week |
| Choices (comfortable) | ~$1,050/week | ~$1,340/week |
That translates to roughly:
| Lifestyle | Single Annual | Couple Annual |
| No frills | ~$36,700 | ~$50,400 |
| Comfortable | ~$54,600 | ~$69,700 |
A “comfortable” retirement for a single person in a NZ metro area costs around $55,000 a year. For a couple, closer to $70,000.
These figures don’t include mortgage payments (they assume you own your home outright), but they do include things like modest travel, dining out occasionally, and a reasonable quality of life.
If you want a great retirement — good travel, nice experiences, real lifestyle freedom — budget higher. $70,000–$90,000 for a single person or $100,000+ for a couple isn’t excessive if that’s the life you’re building toward.
Your Number: A Quick Reference Table
Using the 25x rule, here’s what portfolio size your spending would require in invested assets:
| Annual Spending | Portfolio Required |
| $40,000 | $1,000,000 |
| $50,000 | $1,250,000 |
| $60,000 | $1,500,000 |
| $70,000 | $1,750,000 |
| $80,000 | $2,000,000 |
| $90,000 | $2,250,000 |
| $100,000 | $2,500,000 |
This is your invested portfolio — shares, funds, and income-producing assets. It doesn’t include your home or other non-income-producing assets.
The NZ Super Factor
Here’s where New Zealand is different from the US-centric FIRE advice you’ll find most of the time online.
New Zealand currently has NZ Superannuation — a universal government pension paid to everyone aged 65 and over who meets residency requirements. It’s not means-tested, so your savings and investments don’t affect your eligibility.
Current rates (2026–27, after tax at M tax code):
- Single, living alone: $1,110 per fortnight (~$28,860/year)
- Couples (each): $854 per fortnight (~$22,200/year each, or ~$44,400/year combined)
That’s a solid help. For a couple, NZ Super covers a large chunk of a no-frills retirement on its own.
Should You Count On It?
NZ Super has been around since 1977 and any attempts to remove it would likely be deeply unpopular. But the eligibility age is under consideration to increase from 65, and with an ageing population there’s ongoing political debate about whether it can remain fully funded in its current form.
Our take: consider it, but don’t rely on it as your primary retirement income. Treat it as a bonus that reduces the pressure on your portfolio — not the foundation of your plan.
If you’re 45 today and targeting retirement at 55, NZ Super is 20 years away. A lot can change. Build your number assuming NZ Super doesn’t exist, then let it be the thing that gives you breathing room when it does arrive. Perhaps you can look at increasing your lifestyle, covering unexpected medical costs, gifting some to friends and family, and so on.
Does the 4% Rule Work in New Zealand?
The 4% rule was developed using US market data going back to 1926. New Zealand’s share market is smaller, less diversified, and has had periods of underperformance relative to global markets.
The good news: most FIRE investors in New Zealand aren’t investing solely in the NZX. If your portfolio is globally diversified — through funds like those offered by Kernel, Simplicity, or InvestNow — the underlying data supporting the 4% rule is reasonably applicable.
A few things to keep in mind for NZ-specific planning:
Sequence of returns risk matters more if you retire early. A market downturn in your first few years of retirement can significantly impact how long your money lasts. Many FIRE retirees use a slightly more conservative 3.5% withdrawal rate to add buffer.
Inflation erodes purchasing power over time. A 30-year retirement means your $60,000 spending today needs to keep pace with price increases — build this into your thinking.
Healthcare costs naturally tend to increase as we get older. NZ’s public health system might be sufficient, but having a buffer to cover private healthcare costs is worth considering.
How Lifestyle Affects Your Number
This is where the FIRE calculation gets personal — and where the lifestyle part of financial independence really matters.
Your retirement spending is largely determined by the life you want to live. And the gap between a modest retirement and a great one isn’t always as large as people assume.
Consider two scenarios for a single person:
Scenario A — Modest retirement:
- No overseas travel
- Eating out occasionally
- Simple hobbies, low expenses
- Annual spend: ~$45,000
- Portfolio required: $1,125,000
Scenario B — Choices retirement:
- 1–2 overseas trips per year
- Regular dining and social life
- Active hobbies, gym membership, experiences
- Annual spend: ~$90,000
- Portfolio required: $2,250,000
The difference in quality of life between those two scenarios is significant. The difference in the portfolio required is $1,125,000 — significant, but not insurmountable for someone in their 30s or 40s with time and compounding on their side. If you reached a $1,125,000 portfolio and stopped contributing (but also made no withdrawals), at a 6% real rate of return your portfolio would grow to $2,250,000 in around 10 years.
The lesson: be honest about the life you actually want, then build toward that number. Undershooting your lifestyle target means either returning to work or quietly resenting the retirement you built.
One More Variable: Do You Own Your Home?
The 25x rule and the Massey University spending figures assume you own your home outright by retirement. If you’re carrying a mortgage into retirement — or paying rent — your spending figure goes up significantly, and so does your required portfolio.
Owning your home outright by retirement dramatically reduces your required spending and therefore your required portfolio. It also provides a level of certainty and stability that many appreciate in retirement.
If you’re not on track to own your home by your target retirement date, factor in housing costs explicitly when calculating your number.
So What’s Your Number?
Here’s a simple process to figure it out:
- Estimate your annual retirement spending — be honest and be generous. Think about the life you actually want to live. If you don’t already, try tracking your expenses, ideally for a year. Then you’ll know exactly how much you’re spending and where it’s going.
- Multiply by 25 — that’s your base portfolio target.
- Adjust for housing — if you’ll own your home outright, you’re using the standard figures. If not, add your annual housing cost to your spending estimate first.
- Consider NZ Super as a buffer — don’t reduce your target number, but know that Super will provide meaningful income from 65.
- Add a margin — if you’re retiring early (before 65), consider using 27–28x instead of 25x to account for a longer retirement period and sequence of returns risk.
Most Kiwis targeting a genuinely comfortable retirement are looking at somewhere between $1.5 million and $2.5 million in invested assets, depending on lifestyle and whether they own their home.
Of course this can range from living on as little as $30,000 a year (an extremely frugal lifestyle with a focus on self sufficiency) with only a $750,000 portfolio required — even less if you’re considering Barista FIRE — through to $150,000 a year, requiring a $3,750,000 portfolio, or even more in some cases.
That’s a big number. But with time, compounding, and a clear plan, it’s more achievable than most people think.
The Bottom Line
Your retirement number isn’t one-size-fits-all — it’s personal. But the framework is simple: know what you want to spend, multiply by 25, and start building toward that.
The biggest mistake most people make isn’t getting the math wrong. It’s never doing the math at all and getting started.
Figure out your number. Then build a plan to get to it.
Nothing in this post constitutes financial advice — this is general in nature. Please consult a qualified financial adviser licensed in your jurisdiction for advice specific to your situation. If you would like recommendations for financial advisers, please get in touch.
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