August 5, 2026

NZ capital gains tax calculator: how to estimate what you’ll owe

PropertyTax

Wondering how much tax you could pay when you sell a property or shares? This guide explains how capital gains are calculated in NZ, when tax applies, and how the bright-line test, FIF rules and your income tax rate can affect what you owe.

To estimate the tax on a property or share sale in NZ, you calculate the gain (sale price less cost base and selling costs) and apply your marginal tax rate. The amount depends on whether the bright-line test, FIF rules, or trader rules apply.

Three worked examples follow. No NZ capital gains tax calculator can fully capture your situation. No online tool matches every case. So instead of another form to fill in, this guide walks you through how to actually compute it.

Follow the examples below, and you can run your own numbers with confidence.

Quick Summary

New Zealand has no general capital gains tax. A gain gets taxed only when a specific rule applies. Three main rules matter here: the bright-line test covers residential property; the trader rules cover shares in New Zealand; the foreign investment fund (FIF) rules cover overseas holdings.

When a rule catches your sale, the taxable gain is your sale price minus your purchase price, improvements and selling costs. You add that gain to your taxable income and pay your marginal income tax rate between 10.5% and 39%. You can take a look at the examples below that cover a rental sale, a share disposal, and a FIF position. See how these can help so you can estimate what you’ll owe.

Why there’s no general capital gains tax in NZ

New Zealand has no general capital gains tax (CGT), and no separate capital gains tax rate. Instead, current rules treat certain gains as ordinary income. Unlike countries with standalone capital gains taxes, rates here are simply your income tax rates which can be somewhere between 10.5% and 39%.

So the real question isn’t how much capital gains tax NZ charges. It’s whether a rule catches your sale at all.

The real question is whether a rule catches the sale at all. A gain on the capital account is usually tax-free. And a gain on the revenue account is taxable. It depends on which of the following rules applies:

The bright-line test. When a residential property is sold during a particular time frame.
The trader and their intention. Particularly when assets are bought with the sole reason of reselling for a profit.
The FIF rules. Governs overseas shares and managed funds given a particular cost threshold

How to calculate capital gains tax

Here’s how to calculate capital gains tax when a rule applies. Work out the gain, then apply your marginal rate. This is the same process followed whether or not you’re using any capital gains tax NZ calculator.

Start with your sale price. Use the gross amount before deductions.
Subtract your cost base. That’s your purchase price plus capital improvements.
Subtract your selling costs. Agent fees, legal fees, and brokerage all reduce the taxable gain.
Apply your marginal income tax rate. The gain stacks on top of your other income for the year.

Taxable income band	Marginal rate
$0 to $15,600	10.5%
$15,601 to $53,500	17.5%
$53,501 to $78,100	30%
$78,101 to $180,000	33%
Over $180,000	39%

Take note of the last step. A large gain can eventually push your income into a higher bracket.

Example 1: selling a rental property

If the bright-line test applies, you pay tax on your rental gain at your marginal rate, which currently goes up to 39%. The bright-line period is 2 years for residential property sold on or after 1 July 2024, whenever you bought it. Inland Revenue’s property rules list some exclusions, while the main one covers your family home.

Here’s a CGT calculation example. NZ property investors will recognise the shape of it. It answers that common question on how CGT is calculated on property. For illustration purposes, let’s say you bought a Te Puke rental in October 2024. You decide to sell in March 2026, inside a 2-year window:

Item	Amount
Sale price	$760,000
Purchase price	$650,000
Capital improvements	$10,000
Agent and legal fees	$24,500
Taxable gain	$75,500

On a $95,000 salary, the whole gain sits in the 33% band. Estimated tax: $75,500 x 33% = $24,915. A generic CGT calculator for NZ property won’t show that, because it depends on your other income.

That’s how capital gains tax is calculated under the bright-line test: gain first, marginal rate second. Hold past 2 years, and the bright-line test usually falls away, although the intention rules can still apply.

Example 2: estimating tax on shares

Share gains are taxable if you’re a trader, or you bought the shares mainly to resell. The Income Tax Act 2007 tests your purpose at the time you bought. Long-term buy-and-hold investors generally don’t pay tax on gains. When traders hold shares in a revenue account, their gains become taxable income.

Here’s an example of how to estimate CGT on NZ shares. Say you bought parcels to sell for $40,000, then sold for $52,000 with $150 brokerage. Your taxable gain is $11,850. On an $80,000 income, you pay 33%, so roughly $3,911. Your broker won’t withhold tax on the sale, so you’ll return it through your IR3.

Example 3: a FIF position over $50,000

The FIF rules tax overseas shareholdings once your total cost goes over $50,000 NZD, whether you sell or not. (Budget 2026 has proposed raising this de minimis threshold to $100,000 NZD) Under the default fair dividend rate method, you pay on a deemed 5% return each tax year. The 5% is calculated on the opening market value of your foreign portfolio.

Say your overseas shares and managed funds cost $62,000 and open the year worth $80,000. Deemed income: $80,000 x 5% = $4,000. At a 33% marginal rate, that’s $1,320 of tax, with no sale required. If you’re wondering how much capital gains tax you’ll pay in NZ on the FIF sale itself, there’s usually nothing extra under FDR. The deemed return replaces tax on the actual gain.

There are other methods for calculating FIF income besides FDR (such as comparative value, which taxes the actual change in the portfolio’s value and can work out better in a year the market falls), so it’s worth talking to your accountant about which one suits your situation best.

What Labour’s CGT proposal could change

Labour has proposed a 28% tax on gains from investment property sales from 1 July 2027, with the family home excluded. Bear in mind that this is just a proposal, and not actual law. Here’s how Western Bay of Plenty investors can respond:

What’s changing. Nothing yet. Current rules apply to any sale settling now.
Why it matters. A legislated general CGT would change the maths on holding versus selling.
What you need to do. Nothing urgent. Since this only counts as a proposal right now, we generally don’t advise you to factor it into your long-term plans.
How we can help. We’re tracking its development closely. Our breakdown of Labour’s CGT proposal for property investors provides the latest update on this. Our tax planning service can stress-test your structure calmly.

Frequently asked questions

How is capital gains tax calculated in NZ?

Take your sale price, subtract your purchase price, improvements and selling costs, then apply your marginal income tax rate. That’s how to calculate CGT in NZ whenever the bright-line test or trader rules make a gain taxable. You add the gain to your taxable income and pay 10.5% to 39%.

What is the 6-year rule for capital gains tax?

The 6-year rule is an Australian provision, and it doesn’t apply in New Zealand at all. It lets Australians treat a former home as their main residence for up to 6 years after moving out. NZ law, on the other hand, follows the 2-year bright line test.

How to avoid capital gains tax in NZ?

Most gains are legitimately tax-free here, because there’s no general capital gains tax. In practice, that means three things. Hold property beyond the bright-line period. Buy shares to hold. Use the main home exclusion only where it truly applies.

Structure matters too, especially for property investors and family trusts. A trust with more than $10,000 of trustee income pays 39% on all of it.

How do I calculate what my capital gains tax will be?

Follow the same steps as any capital gains worked example in NZ. Take the sale price, less cost base, less selling costs, times your marginal rate. Inland Revenue’s calculators and tools‘ help you here. If two rules could apply, have the tax calculated properly before you commit.

Get the real number before you sign anything

Any NZ capital gains tax calculator is a starting point, not an answer.

If you need real figures for what your CGT bill could look like, then send us your scenario, and we’ll run it for you. No pressure, just a clear figure.