How to spend your money as intelligently as you saved it.
Everyone gets told to save. The financial advice industry is overwhelmingly structured around accumulation — growth, diversification, the long game. But the moment you flip from saving to spending, the frameworks disappear and most people end up winging it. FLOW is the playbook for that transition. Four elements that build on each other and together make the difference between a retirement that works financially and one that keeps you up at night.
Reframe the mission first
Before the mechanics, there's a mindset shift that matters more than any individual strategy. When you were accumulating, your job was simple — grow wealth. Every decision pointed in one direction. Decumulation has a completely different objective. You're not trying to grow wealth anymore. You're trying to convert it into a life.
Getting the mission wrong is the root cause of most decumulation mistakes. Good accumulators often make poor decumulators — they keep applying growth logic to a spending problem. They hold too aggressively because they hate the idea of selling. They underspend for years because the portfolio feels like a number to protect rather than a resource to deploy. The real risks in retirement are different from the ones you managed on the way up.
Running out of money before you run out of life. With retirements lasting 25–35 years, this is the central planning challenge.
A market crash in your first few years of retirement can permanently damage a portfolio in ways that later recoveries cannot fully repair.
Drawing down in the wrong order can cost tens of thousands of dollars in unnecessary tax over a retirement. Most people never ask the question.
Spending so cautiously that you deprive yourself of the retirement you worked for. Dying with significant unspent wealth is a failure nobody talks about.
“The goal isn't to die with the most money. The goal is for the financial machinery to be quiet enough that you can actually live.”
F — Floor
The first step before any investment decision is to understand your guaranteed income — money that arrives every month regardless of what markets do, regardless of how long you live. For almost every New Zealand retiree, that floor has a name: NZ Super.
Inflation-adjusted, paid fortnightly, for life. You cannot outlive it. You don't manage it. It just arrives. A financial adviser would charge between $600,000 and $800,000 to replicate this income stream through a commercial annuity product. Most retirees treat NZ Super as a top-up. The smarter framing is to treat it as the foundation — and build everything else on top of it. Always verify current rates at Work and Income (workandincome.govt.nz).
- →Your minimum income regardless of portfolio performance
- →How much risk you actually need to take with invested assets
- →How much you truly need in Bucket One cash
- →Whether you need commercial annuity products at all
- →How aggressively Bucket Three can be invested
The practical implication: If NZ Super covers your baseline living costs — mortgage-free housing, food, utilities, transport — then your investment portfolio is not a survival tool. It's a quality-of-life tool. That distinction matters enormously for how you structure everything else. Other floor sources may include defined benefit pensions (rare in NZ but not unknown), fully-owned rental income, or structured part-time income in early retirement.
L — Layers
Once you know your floor, the question is what to do with everything else. The answer is to organise it into three layers — the bucket strategy. It solves a problem that's more psychological than mathematical: the terror of having to sell growth assets at the wrong time to cover living costs. That's how retirements that should have been fine go wrong.
Cash or very short-term deposits. This is your operational money — the account you pay bills from. Its job is simple: make sure you never have to sell anything to cover living costs. Market crashes don't touch Bucket One. You already have the money you need.
With approximately $44,000 of NZ Super flowing annually, many NZ retirees find they only need 6–12 months of discretionary spending here rather than two full years of total expenses.
Lower-volatility assets whose job is to replenish Bucket One when it runs low. You're not trying to generate growth here — you're generating stability and a return above cash, so that Bucket One can be refilled without touching growth assets in a downturn.
The buffer Bucket Two creates is what allows Bucket Three to do its job properly. Don't undersize it out of a desire to maximise growth.
Equities, growth funds, direct shares. This is the part of your portfolio still doing what it did during accumulation. With Buckets One and Two protecting it, you're not drawing from it regularly and not forced to sell during downturns.
Because NZ Super covers your baseline, many NZ retirees can hold significantly more in this bucket than conventional wisdom suggests. The markets can be volatile. Your lifestyle doesn't have to be.
O — Order
This is the section most people skip — and it might be the one worth the most money. Even with the right assets in the right bucket structure, drawing them down in the wrong order can cost tens of thousands of dollars in unnecessary tax over a retirement. The question is: when you need to top up Bucket One, which account do you draw from first?
You can access KiwiSaver from 65, but should you draw it immediately? If you have other liquid assets available, there's a strong case for leaving KiwiSaver compounding — every year you delay is another year of tax-advantaged growth. The decision is individual, but it should be made explicitly rather than defaulted to. Ask the question before you act.
PIE funds tax returns at your Prescribed Investor Rate — 10.5%, 17.5%, or 28% depending on income. In retirement, with lower income, your PIR may drop significantly. Assets generating returns inside a PIE structure at 17.5% rather than your previous marginal rate represent real compounding value over a 25-year retirement. Structure matters — ask your accountant.
Tax is calculated on 5% of the opening portfolio value, regardless of actual performance. Optimal in years of strong returns — you pay tax on a deemed 5% even if you made significantly more.
Tax is calculated on actual gains — opening value subtracted from closing value plus distributions. Optimal in flat or negative years — you only pay tax on what you actually made.
The key point almost nobody acts on: You choose your FIF method after the tax year ends, independently each year. In a good year, elect FDR and pay tax on only 5% of your portfolio value. In a bad year, elect CV and pay tax on your actual (lower or negative) return. You always get to use the better option in hindsight. This requires a tax accountant who understands FIF rules — but it is absolutely worth asking about.
W — Withdrawal Rate
The question most retirees have been quietly terrified of: how much can I actually spend? Most err heavily on the side of caution, underspend for years, and end up with significant unspent wealth at death — a form of failure nobody talks about. The four percent rule is the most common answer, but it was never designed for New Zealand retirees and applying it blindly misses several important nuances.
Why this matters: The four percent rule was derived from US data assuming your portfolio is your only income source. For NZ retirees with NZ Super as a guaranteed floor, the portfolio only needs to cover the gap. This means your portfolio can be smaller than the rule implies and still be adequate — or that you can spend more comfortably without meaningful longevity risk. The four percent rule understates how well-positioned most NZ retirees actually are.
Imagine two retirees with identical portfolios and identical average returns over 20 years. The only difference: one experiences poor returns in years one to five, strong returns thereafter. The other has the opposite. The first retiree can run out of money while the second dies wealthy. Same average return. Completely different outcome. The reason is withdrawals — when markets fall and you're drawing down, you're selling more units to generate the same income. Those units aren't there for the recovery. The compound damage is permanent, not temporary. The first five years of retirement are the most financially fragile. The bucket strategy is the primary structural defence against this risk.
Know your guaranteed income. Understand what it covers. Be clear on the gap. Everything downstream depends on this number.
Organise remaining assets into three buckets. Be honest about Bucket One sizing given NZ Super is flowing.
Ask the KiwiSaver timing question. Know your PIR rate. Make sure someone is choosing your FIF method each year.
Not a fixed number — a starting point with a dynamic mindset. Spend more in good years. Tighten up in bad ones.
“Done well, decumulation fades into the background. The money becomes a tool rather than a source of stress. And then the PINS get to do their job.”
Where to start
Calculate your floorList every source of guaranteed income. Add it up. Compare it to your expected annual spending. The gap is what your portfolio needs to fill — and it's probably smaller than you think.
Structure your buckets before you need themDon't wait until retirement to set up the three-bucket framework. Ideally start 3–5 years out so Buckets One and Two are funded before you stop drawing a salary.
Talk to a tax accountant about FIFIf you hold offshore equities or funds, make sure someone is actively choosing your FIF method each year — not just defaulting to FDR. It's a straightforward question worth asking explicitly.