What to Do With a Large Sum of Money

A practical guide to making the most of a lump sum, whether it came from a business sale, an inheritance, a property sale, a redundancy, or anywhere else.

A large sum of money just landed in your bank account. Maybe you sold a business you spent decades building. Maybe a parent passed away and left you more than you expected. Maybe you sold a property, took a redundancy, cashed in an investment, or received a significant bonus.

Whatever the source, you are now staring at a number on a screen larger than anything you have held before. The pressure to do something with it is already building.

This guide explains what to do in the first weeks, first months, and long term after receiving a financial windfall in New Zealand. Most people move through three broad phases:

1. ‍Pause (protect the capital while you adjust),
2. Plan (understand tax, structure, and goals), and
3. Deploy (put the money to work with discipline).

The order matters.

New Zealand data is lacking, though research from Ohio State University found roughly a third of Americans who received an inheritance had negative savings within two years of receiving it. A third. Gone. Presumably not on anything sensible. Closer to home, an FMA and CFFC survey of New Zealanders approaching retirement found one in ten planned to withdraw their KiwiSaver lump sum and simply spend it rather than reinvest. The pattern is consistent across borders: windfalls vanish when there is no plan.

If your situation is specific to one source, we have written detailed companion guides for those who have sold a business and need to decide what to do with the proceeds, inherited a significant sum and want practical guidance on next steps, or sold a property and want to put the proceeds to work. Each covers the ground specific to the source of your windfall. This article covers what all of them have in common.

Phase One: The Most Valuable Thing You Can Do Is Nothing

Step away from the keyboard. Close the banking app. Pour yourself a drink (a modest one; you still have decisions to make).

The single most important advice for anyone who has just received a windfall is to pause. Park the money in an on-call savings account for three to six months. The interest rate will be unremarkable. The protection it gives you against a rushed, emotionally charged decision is worth far more.

The emotional state surrounding a windfall is a terrible foundation for financial decisions. Grief after a bereavement, adrenaline after a business sale, relief after a redundancy, sheer excitement: all of these push people towards committing capital too quickly, chasing returns, or letting guilt and generosity override arithmetic.

Psychologists call it mental accounting: money received suddenly or without effort feels different from money earned over years, even though a dollar is a dollar. This is one reason windfalls are so often squandered. Money perceived as a "bonus" gets treated as disposable, when it should be treated as the most consequential capital you have ever held.

One distinction worth making: a deliberate pause is not the same as procrastination. The pause has a defined end point. Procrastination is leaving money in a savings account for five years because the decision feels too hard. Set a date. Commit to having a plan by then.

Everyone Will Have an Opinion

When a large sum arrives, people notice. Your bank will call, keen to discuss what you plan to do with the funds, and will suggest products they happen to offer. A well-meaning relative will recommend a rental property. A colleague will mention cryptocurrency. Your nephew might have a course on forex trading. (Politely decline.)

None of this is necessarily ill-intentioned, but all of it creates pressure to act before you are ready. The best defence is a set of principles formed early: know what you will and what you will not consider, even if the details are unfinished. If anyone asks, you are working with a professional and the plan is still being finalised.

Four Ways People Waste a Windfall

Most windfall mistakes are not dramatic. Nobody wakes up and decides to blow the lot. The damage is usually slower and subtler than anyone expects.

Leaving it all in the bank. This is the most popular default. It feels safe. The number on the statement stays still. But consider what actually happens over time.

Suppose you receive $1 million and leave it in the bank at 4% gross interest. The account earns $40,000 a year.

At a 33% marginal tax rate, roughly $26,800 remains after tax: an after-tax return of about 2.7%.

If inflation averages close to the Reserve Bank's 2.5% midpoint, prices roughly double over 30 years. Your bank balance still reads $1 million. In today's dollars, it buys what $475,000 buys now.

The number stayed the same. The purchasing power more than halved.

New Zealand's Depositor Compensation Scheme covers only $100,000 per depositor, per licensed deposit-taker. A large sum at a single bank leaves most of it above the threshold. Though admittedly, the real risk of banked savings is not a bank failure. It is the slow, invisible erosion of inflation described above. Term deposits are hardly the safe option most people assume.

Concentrating in a single asset. Whether it is one rental property, one share, or one speculative venture, putting everything into a single bet repeats the structural risk many windfall recipients just exited.

This matters more in New Zealand than in most comparable countries. Treasury research shows residential property accounts for close to 58% of total household net worth. Most New Zealanders are already heavily exposed to a single asset class, in a single country, in a single currency. A windfall is the chance to fix this. Diversification is the antidote, and for many people it is the most important financial decision they will make with the proceeds.

Gifting too early. The impulse to help family, especially adult children, is understandable. But premature generosity has consequences. Once the money is gone, it is gone. If your circumstances change, you cannot recall it. The arithmetic of your own retirement may not support the generosity you feel in the moment. Only gift once the full picture is clear.

Doing nothing indefinitely. Some people park the money and never make a decision. This is not caution; it is avoidance. Every year of inaction is a year of inflation quietly eroding purchasing power.

Phase Two: Understanding the Tax Position

There is no single tax answer for a windfall. In New Zealand, the treatment varies significantly by source:

• Inheritance: generally not taxed, though income earned on the inherited amount is taxable from the point you receive it. Our guide to handling an inheritance in New Zealand covers the detail.
• Business sale: depends on whether it was a share sale or asset sale, and how the purchase price was allocated. Some components may be taxable. Professional advice is essential. Our guide for business owners navigating post-sale decisions covers the ground.
• Property sale: not taxed if it is your main home. Investment properties may be taxable under the bright-line test if sold within two years of purchase. Commercial properties involve depreciation recovery and potential GST. This is where property sellers are most often caught out.
• KiwiSaver withdrawal at 65: not taxed, as contributions were taxed within the fund.
• Redundancy: generally taxed as employment income, though some payments qualify for concessional treatment depending on structure. Inland Revenue's guidance covers the detail.
• Bonus or commission: taxed as regular income at your marginal rate.
• Insurance payout: generally not taxed if it is a lump sum from a life, trauma, or income protection policy you funded personally.

The universal rule: if you are unsure, set aside enough to cover potential tax before you do anything else. An accountant is well worth the cost. The alternative is discovering the obligation after you have spent the money.

Three Things Worth Sorting Before You Deploy a Dollar

Relationship property. Under the Property (Relationships) Act 1976, some windfall sources (such as inheritances) may qualify as separate property. However, separate property can become relationship property through commingling: depositing it into a joint account, using it to pay down a joint mortgage, or purchasing a jointly held asset. Once the boundary is crossed, unwinding is difficult. A brief conversation with a family lawyer before you deploy any funds is worth the modest cost.

Your will and estate plan. A windfall changes the composition of your wealth, often dramatically. Beneficiary designations, gifting intentions, and the practical mechanics of administering your estate all need to reflect the new reality. If you have not reviewed your estate plan recently, this is the nudge.

KiwiSaver is probably the wrong home for a large lump sum. KiwiSaver is designed for regular retirement savings with strict withdrawal conditions. If you are under 65, the money is locked away. If you are over 65, it can only be held in one person's name, which limits its usefulness for couples managing a shared pool of capital. Accessible managed funds, held outside KiwiSaver, offer similar investment exposure with the flexibility to withdraw when you need to.

Phase Three: What to Actually Do With the Money

Once the pause is over, the tax position is clear, and any structural issues are resolved, the question becomes: what next?

For most people with a meaningful windfall, the answer involves some combination of the following, roughly in this order:

1. Repay high-interest debt. A credit card charging 20% is costing more than any realistic investment return will earn. Clear the expensive debt first. The psychological relief alone is worth it.
2. Top up your emergency fund. Three to six months of household expenses, held in an accessible account. If your windfall arrived because of a redundancy, this step is non-negotiable.
3. Set a small amount aside for something enjoyable. Five percent of the windfall for a holiday, a long-delayed purchase, or something you have been putting off. Allowing yourself a modest reward makes the discipline of managing the other 95% far easier. Do not let 5% become 25%.
4. Invest the remainder for growth. For most people, a diversified portfolio spread across asset classes and geographies is the most effective way to preserve and grow a windfall over time. New Zealand accounts for roughly 0.06% of global equity markets. A portfolio limited to local assets carries concentration risk most people did not intend.

For those approaching or already in retirement, the question narrows: how do you draw a reliable income without running the money down too quickly? A widely referenced rule of thumb for sustainable drawdowns is around 4% of the portfolio's value per year, adjusted for inflation. On $1 million, a 4% drawdown gives roughly $40,000 per year before tax.

A caveat: the 4% figure originated from US research using US tax settings and US market returns. In New Zealand, the appropriate rate depends on your tax position, investment mix, and how long your money needs to last. It is a useful starting point, not a prescription.

"The hardest part is often not the financial decision," says Marcus Mannering, a financial adviser at Become Wealth. "It is the gap between receiving the money and feeling ready to act. People expect clarity to arrive with the bank transfer. It does not. Clarity comes from a plan, and a plan comes from asking the right questions."

The Questions Worth Asking First

Your finances exist to serve your life, not the other way around. Before a single dollar is invested, the real work is understanding what the money is for.

How do you picture your life in five years? Think about family, community, work, finances, where you live.

What have you been putting off because of money? A windfall can resolve long-standing constraints, but only if you identify them.

Are there people you want to help financially? If so, how much can you give while still meeting your own needs?

What concerns, feelings, or needs do you have when you think about money?

The answers shape everything: how much risk is appropriate, how income is drawn, when to be generous and when to be cautious, and what success actually looks like for you.

Do You Actually Need a Financial Adviser?

Not necessarily. If the windfall is modest, your goals are simple, and you are comfortable riding out market volatility without making reactive decisions, a self-directed approach can work well.

Where complexity tends to break DIY approaches is in the areas most windfall recipients eventually face: coordinating accountant, lawyer, and financial system across six- or seven-figure decisions, tax-efficient structuring, behavioural discipline during market crashes, and due diligence on wholesale investment offers promising returns too good to be true. For most people in this position, independent research consistently shows the value of good financial advice exceeds the fee by a significant margin.

Good advice has a cost. Going without it typically costs more.

All at Once, or Gradually?

Once you have a plan, the question becomes: invest the full sum immediately, or phase it in over time? The data consistently favours investing earlier rather than later. Markets go up more often than they go down, and money on the sideline earns less than money at work. The mechanics of dollar-cost averaging versus lump-sum investing are worth understanding before you decide.

In practice, the decision is also psychological. If investing a large sum in one go keeps you awake at night, a phased approach over three to six months is a reasonable compromise. The small statistical cost of phasing is easily offset by the benefit of sleeping soundly.

The Windfall Might Be the Easy Part

Receiving a windfall could be the simplest step in the process. Nobody has ever struggled with the mechanics of watching a large sum land in their bank account. The quality of the next decision, not the size of the windfall, determines the outcome.

Pause. Plan. Understand the tax. Get aligned with your spouse. Repay what needs repaying. Achieve your long term aims in life by investing the rest with discipline and diversification. Resist the "uncle with the can't-miss" opportunity.

If any of this raises questions, our team regularly works with people making decisions about a windfall. Become Wealth (FSP249805) is one of only 48 firms in New Zealand holding both a Financial Advice Provider licence and a Discretionary Investment Management Service licence, meaning we can manage investments directly on your behalf. Become Wealth is trusted to advise on over $1 billion. Your initial consultation is complimentary and entirely at your pace. Financial freedom looks different for everyone. The first step is working out what it looks like for you.