Capital Gains Tax: What It Would Mean

New Zealand has no comprehensive capital gains tax, one of the few OECD countries without one. It does already tax some gains in specific cases, but there is no single broad regime. Whether that should change is back on the table for the 2026 election, with Labour proposing a 28% tax on gains from investment property. Before weighing any of it, it helps to understand what a capital gains tax is, how one works in practice, and how rarely tax settings stay where they start. The answers matter most if you own, or plan to own, investment property.

What a capital gains tax is

A capital gains tax is a tax on the increase in value of an asset between when you buy it and when you sell it. Buy something for $500,000, sell it later for $700,000, and the $200,000 increase is the capital gain. A capital gains tax takes a percentage of that gain.

It is different from income tax, which taxes what you earn from working or from a business as you earn it. A capital gain builds up silently while you hold the asset and is only realised, turned into cash, when you sell. Most capital gains taxes work the same way: nothing is payable while you hold, and the tax is triggered by the sale.

The detail is where these taxes get interesting, and where they differ wildly between countries. What counts as an asset? Is the family home included? Is the gain adjusted for inflation, or taxed in full? What happens if you make a loss instead of a gain? Can that loss reduce other tax you owe? The headline rate tells you very little until those questions are answered. A 28% tax that ignores inflation and refuses to recognise your losses can bite harder than a 40% tax that indexes for inflation and lets losses offset gains. For a property owner, the valuation date the tax measures from and its treatment of inflation will do more to set the bill than the rate.

Does New Zealand have a capital gains tax already?

New Zealand does not have a comprehensive capital gains tax, but under current Inland Revenue rules several regimes already tax gains in specific cases. Property sold within the bright-line period, currently two years from July 2024, is taxed on the gain. Property bought with the intention of resale is taxable however long it is held. Overseas shares and managed funds above a cost threshold are taxed annually under the Foreign Investment Fund rules, whether or not anything is sold. People who trade shares or property as a business are taxed on their profits as income. There are also entirely legal ways to reduce tax within these rules. So the question is whether to widen what already exists, and by how much.

How a capital gains tax works: a simple example

Take an investor who buys a rental for $600,000 and sells it eight years later for $850,000. The capital gain is $250,000. Under a simple 28% capital gains tax, ignoring costs and improvements for simplicity, the tax would be $70,000, leaving $180,000 of the gain in the investor's hands.

The result looks clean until inflation and losses are counted. If general prices rose, say, 25% over those eight years, a large part of the $250,000 is the dollar losing value rather than enrichment. The property had to climb just to keep pace. A capital gains tax that ignores inflation, as Labour's proposal does, taxes the inflationary portion as though it were profit. Losses, and whether the starting value is the price you paid or some later figure, matter just as much under the proposal on the table.

What Labour is proposing

Labour's proposal is a 28% tax on gains from residential and commercial investment property, applying to sales from 1 July 2027. The family home, KiwiSaver investments, shares, business assets, and farms are all excluded. The rate matches the company tax rate. Revenue is earmarked for health spending, including free GP visits. Labour has stressed that most New Zealanders would not pay it, because the family home, where most household wealth sits, is out.

The tax would apply only to gains made after the start date. Property would be valued as at 1 July 2027 and only the increase above that figure would be taxed. In practice each owner would set a value for their property at that date, likely through a registered valuation, the council rating value, or a similar method Labour has yet to confirm. It remains unclear how Labour proposes to handle the hundreds of thousands of valuations needed. Capital improvements you fund along the way are added to the cost base, so they are not taxed as gain.

So far, so reasonable. Much of the detail is unsettled, though, and with tax the detail is where the outcomes live. The 28% rate, the 1 July 2027 start, the exemptions and the valuation-day approach are defined. The treatment of losses is only signalled. The exact valuation method, and whether interest stays deductible, remain open, and Labour has said different valuation options for the switchover are still being worked through. The examples below show how the proposal would behave if enacted as currently described.

The choice of what to exclude raises its own fairness questions, and astute readers will already have spotted a few. Because farms, the family home, shares and business assets are all out, a farmer selling an $8 million farm would pay nothing. Nor would a successful business owner selling a $15 million home in Herne Bay. Yet a school teacher who owns their own home and a single $700,000 rental would pay the tax on the rental's gain. A tax aimed at fairness which falls on the small investor while leaving far larger fortunes untouched invites an obvious objection. Carve-outs of this kind are also the detail most often revisited once a tax is in place.

Will you pay capital gains tax in New Zealand?

For most people, no. If you own only your own home, you would pay nothing: the family home is excluded, and so are KiwiSaver, shares, business assets and farms. If you own a residential or commercial investment property, you would pay 28% on the gain accruing after 1 July 2027. The tax falls due only when you sell, and only on the increase above the property's value at that date.

The losing investor the headline forgets

The political framing of a capital gains tax always assumes the investor is sitting on a gain. Plenty are not. Consider someone who bought a $1,000,000 investment property in Auckland near the market peak, and watched it fall to $800,000 by the time the policy takes effect. Because the tax measures from the 1 July 2027 value, their starting line is that depressed $800,000, not the $1,000,000 they paid.

The proposal as described treats them unkindly whether they sell or hold.

Suppose they sell at $800,000, crystallising a $200,000 loss. On the design Labour has described so far, losses would be ring-fenced. They could not be offset against your salary or any other income, only carried forward against future capital gains from housing. So this investor would get no refund and no relief against other tax. If they then exit property investment altogether, having had enough, the $200,000 loss is stranded and worth precisely nothing. The loss rules are among the details Labour has yet to finalise, so the treatment could change.

Holding on can be worse. The valuation at 1 July 2027 sets the base at the depressed $800,000. Suppose the market recovers over the following years, the property climbs back to $1,000,000, which is merely what they originally paid, and then a little further to $1,100,000, at which point they sell. Measured against what the property cost them, their gain is $100,000. The tax is measured against the $800,000 valuation instead. The taxable gain is $300,000, and at 28% the tax is $84,000. They are $100,000 better off and hand over $84,000 of it, an effective rate of 84%. The starting line was drawn at the bottom of their personal loss rather than at their purchase price.

Most investors selling well above their valuation-day figure would face something much closer to the headline 28%. The scenario shows how a tax measured from an arbitrary date, with no inflation adjustment and no recognition of a real-terms loss, can produce a bill with little relation to profit. Anyone who bought near the 2021 property market peak and is still underwater when the policy begins sits closest to the trap.

Taxes rarely stay where they start

Even an investor untroubled by the current design should weigh one further point, the most important and the least discussed. A tax introduced narrowly and at a modest rate has a long history of becoming neither narrow nor modest. New Zealand's own tax history makes the pattern plain.

1. When income tax arrived in 1891, it was aimed squarely at the wealthy. Individuals earning under £300 a year were exempt, which was most of the population at the time, and the top rate was just 5%. It was sold as a tax the ordinary worker would never pay. Today income tax reaches almost every earner in the country, and the top personal rate is 39%. The rate climbed, and the share of people caught widened from a small wealthy minority to virtually everyone. Each shift was a series of incremental adjustments by successive governments, none of which felt dramatic on the day, a slow drift that continues today through bracket creep.
2. GST tells a shorter version of the same story. It was introduced in 1986 at 10%, lifted to 12.5% in 1989, and raised again to 15% in 2010. A tax sold at one rate sat at half as much again within a generation.

History does not prove Labour intends to broaden its capital gains tax later. It does show the rate and reach of a tax at introduction tell you very little about where it settles decades on. A 28% tax on investment property, with the family home carved out, is a starting position. The carve-outs which make a tax palatable at launch are exactly the features later governments find easiest to trim. Anyone making a 30-year investment decision on the strength of today's exemptions is betting those exemptions survive 30 years of fiscal pressure and changing governments. History suggests the exemptions will be trimmed long before then.

The case on the other side

There is a serious argument for a capital gains tax. New Zealand is an outlier among developed economies in having no broad version of one. Someone who earns a salary is taxed on every dollar, while someone whose wealth grows through rising asset values can pay nothing. Taxing those gains can be defended as fairer. It can also be defended as a way to reduce the incentive to pour savings into property over more productive investment. And it would broaden a tax base which leans heavily on income and GST. Some, like the Green Party, go further still and favour an annual wealth tax rather than a tax triggered only on sale. Reasonable people land in different places on all of this, and an election is the right venue to settle it.

A brief look across the Tasman

Australia offers a live example. It has taxed capital gains since 1985. Recent Budget proposals there set out scrapping the 50% discount investors had enjoyed and replacing it with inflation indexation plus a minimum 30% rate, for gains from 1 July 2027. Indexing for inflation sounds gentler than New Zealand's nominal approach, and for a single rising asset it can be. But losing the discount would mean high earners pay their full marginal rate, up to about 47%, on the indexed gain rather than half their rate on the whole gain. On the detail published so far, indexation appears to apply to gains but not to losses. Some analysis suggests an investor holding a spread of shares could then be taxed on a paper gain larger than their portfolio-wide gain in real terms. The package, sold as fairer, looks in several respects harsher. It is a proposal, not yet law, still working through parliament, and may yet be softened.

The Australian numbers depend heavily on individual tax brackets and asset mix. The lesson for a New Zealand reader is how differently two governments can build something both call a capital gains tax. One taxes inflation directly, while the other can tax paper gains with no matching relief for paper losses.

What this means for a decision now

Whenever a tax change is floated, the temptation is to act before it exists. We field a version of this constantly: should I sell my rental before 2027 to get ahead of a capital gains tax?

The answer is almost always no. A proposal may be amended, traded away in coalition talks, or never reach the statute book. Because only post-2027 gains would be taxed, the gain you have already built is protected whether you sell or not, which weakens the case for a rushed exit. A depressed 2027 valuation could even work against you if you sell into weakness. There are good reasons to sell, a short holding horizon, a sale already planned, debt or liquidity pressure, and the proposal is none of them. Whether property is still worth holding turns on the asset and your aims, not on a campaign announcement. If the policy does arrive, be ready to evidence the property's value at the switchover date. If you plan to buy, factor in that future gains on investment property may eventually be taxed, and let the asset stand on its own merits first.

Marcus Mannering, a financial adviser at Become Wealth, puts the trap plainly:

"The investors who get hurt are usually the ones reacting to news flow. Base investment decisions on the merits of the asset, your aims, tolerance for risk, your other assets, and your phase of life, not on the headlines."

If you are unsure where you stand, model your position under both the current rules and the proposal before acting. We can run that with you, including how a 2027 valuation and ignored inflation would affect you. Book a complimentary initial consultation to talk it through.

^{Become Wealth Limited (FSP249805) is licensed by the Financial Markets Authority as a DIMS provider and Financial Advice Provider. This is not tax advice, and much of the proposal discussed here is not yet law and may change. Seek advice from a suitably qualified tax professional before acting.}