The Australia-New Zealand DTA and the Trans-Tasman Relationship

The Australia-New Zealand Double Tax Agreement has been in force since 2010 (updated from an earlier 1995 version). It represents one of the most developed bilateral tax relationships in the world, reflecting the uniquely close economic, political, and social relationship between Australia and New Zealand.

The Trans-Tasman corridor is extraordinary: over 700,000 New Zealanders live in Australia, and over 60,000 Australians live in New Zealand. The freedom of movement under ANZCERTA (Australia and New Zealand Closer Economic Relations Trade Agreement) allows citizens of each country to live and work in the other with minimal immigration barriers. The DTA reflects this special relationship.

Understanding the DTA is essential for the millions of Trans-Tasman expats managing tax obligations in both countries. Additionally, New Zealand has a unique capital gains tax (the bright-line test for residential property), which interacts in specific ways with Australian capital gains tax rules. This guide outlines the key provisions and practical implications.

The Trans-Tasman Special Relationship

Beyond taxation, Australia and New Zealand share several unique institutional frameworks affecting expats. ANZCERTA grants New Zealand citizens the automatic right to work and live in Australia (and Australians have reciprocal access to New Zealand). There is a Social Security Agreement that coordinates social security payments between the two countries, preventing gaps in entitlements for expats.

Additionally, there is a Trans-Tasman Portability of Certain Entitlements Agreement that allows certain social security payments (like Age Pension) to be received by a person from one country while living in the other. This is important context for retirement planning for Trans-Tasman expats.

For tax purposes, the unique freedom of movement means many people move between the countries multiple times and may have tax residency in both countries simultaneously. Understanding residency in each country is critical.

New Zealand's Tax System Overview

New Zealand imposes income tax at progressive rates: 10.5%, 17.5%, 30%, and 39% on different income brackets. There is no separate capital gains tax in New Zealand; capital gains are generally not taxed at all. However, New Zealand has a "bright-line test" for residential property: property purchased and sold within 2 years, 5 years, or 10 years (depending on purchase date and property type) can be subject to tax on the gain.

This bright-line test is not a capital gains tax but rather a specific rule applying to residential property transactions. It does not apply to commercial property, land, or most other assets. For investment property not covered by the bright-line test, gains are generally not taxed in New Zealand.

New Zealand also imposes Goods and Services Tax (GST) at 15% on most supplies. There is no sales tax at state/regional levels.

New Zealand taxes residents on worldwide income. A resident is a person who is in New Zealand for more than half the year, or who is ordinarily resident in New Zealand. Non-residents are taxed only on New Zealand-source income.

Key Provisions: Dividends, Interest, and Royalties

The Australia-New Zealand DTA specifies maximum withholding tax rates for investment income.

Dividends paid by an Australian company to a New Zealand resident are subject to a maximum 15% withholding tax under the DTA. Without the DTA, Australian withholding tax on dividends is 30%. Additionally, Australian companies pay dividends with franking credits (also called imputation credits), which represent tax already paid by the company. New Zealand shareholders can claim the franking credits under DTA provisions.

Interest paid by Australian borrowers to New Zealand residents is subject to a 10% withholding tax under the DTA, matching Australia's standard interest withholding rate.

Royalties are subject to a 10% withholding tax under the DTA.

The interaction between Australian franking credits and New Zealand taxation is important: a New Zealand shareholder of an Australian company receiving a dividend benefits from both the reduced withholding rate (15% vs 30%) and the ability to claim Australian franking credits on their New Zealand tax return, providing a significant tax benefit.

Employment Income

The DTA provides that employment income is taxed in the country where the work is performed. A New Zealander working in Australia is taxed by Australia on wages earned in Australia. An Australian working in New Zealand is taxed by New Zealand on wages earned in New Zealand.

The DTA contains a 183-day rule: if an employee is present in a country for fewer than 183 days in the year and is not a resident of that country, employment income is taxed in the employee's country of residence, not the country where work is performed. This rule provides relief for short-term assignments and consultants.

The Trans-Tasman corridor is very active for employment mobility. Many employees move between the countries multiple times and may work across borders. The 183-day rule and residency definitions become critical in these situations.

Business Profits and Permanent Establishment

Business profits are taxed in the country where the "Permanent Establishment" (PE) is located. A New Zealand company operating in Australia with a fixed place of business (office, warehouse, project site) has a PE in Australia and is taxed by Australia on profits derived from that PE. Similarly, Australian companies operating in New Zealand with a PE are taxed by New Zealand on profits attributable to that PE.

Work performed remotely from one country for clients in the other (without a fixed office in the other country) typically does not create a PE and is not taxed by that country under the DTA.

Australian Franking Credits and Imputation System for New Zealand Shareholders

This provision is unique to the Australia-New Zealand DTA and provides significant benefits to New Zealand shareholders of Australian companies. In Australia, companies pay company tax (30%) on profits and then pay dividends from after-tax profits. The franking credit represents the company tax paid and is attributed to the shareholder.

Under the DTA, a New Zealand resident who is a shareholder of an Australian company can claim the Australian franking credit on their New Zealand tax return. This provides a significant tax benefit: the shareholder receives credit for Australian company tax paid, reducing the overall New Zealand tax on the dividend.

For example, if an Australian company pays a dividend with 30% franking, a New Zealand shareholder includes the dividend plus the franking credit in their New Zealand income and claims the franking credit against New Zealand tax owing. The net effect is a significant reduction in New Zealand tax compared to a dividend from a New Zealand company (which has no franking).

This benefit is unique and valuable for New Zealand investors in Australian companies and reflects the special relationship between the two countries.

Capital Gains on Australian Property

The DTA allocates taxation rights for capital gains on tangible property (real estate) to the country where the property is located. Capital gains from the sale of Australian property are always taxed by Australia, not New Zealand.

In Australia, capital gains on property are subject to capital gains tax (CGT) at the seller's marginal income tax rate. For non-residents (including New Zealand nationals who are not Australian residents), there is no main residence exemption. Capital gains on Australian property are subject to CGT at full rates (up to 45% plus Medicare levy). A Foreign Resident Capital Gains Withholding (FRCGW) of 12.5% of the sale price is held by the purchaser's solicitor and remitted to the ATO.

New Zealand has no capital gains tax (except the bright-line test for residential property). A New Zealand resident selling Australian property pays only Australian CGT (or FRCGW if non-resident). There is no double taxation on capital gains due to New Zealand's lack of a general capital gains tax.

However, if the New Zealand resident also owns New Zealand property that falls within the bright-line test, that property may be subject to tax in New Zealand. The distinction between Australian CGT and the New Zealand bright-line test is important to understand.

Rental Income from Australian Property

Rental income from Australian property is taxed in Australia under the DTA. If the owner is a New Zealand resident, New Zealand also taxes worldwide rental income (including Australian rental income).

In Australia, rental income is taxed at the owner's marginal rate. Non-residents are taxed at a flat 45% rate plus Medicare levy. Deductions for mortgage interest, rates, insurance, maintenance, and depreciation are available. Negative gearing (deductions exceeding income) can be carried forward.

A New Zealand resident owning Australian rental property is also subject to New Zealand tax on the rental income and deductions. The DTA provides a foreign tax credit mechanism: the New Zealand resident claims credit for Australian tax paid against New Zealand tax owing, reducing the overall New Zealand tax liability.

For New Zealand investors, negative gearing in Australia (where deductions exceed income) creates an annual tax loss that can be claimed in New Zealand as a foreign tax credit, subject to limitations.

The New Zealand Bright-Line Test and Interaction with Australian CGT

New Zealand's bright-line test is not a capital gains tax but a specific rule for residential property: property acquired and disposed of within 2 years, 5 years, or 10 years (depending on purchase date and property type) is subject to tax on the gain. The relevant timeframe depends on when the property was purchased.

For Australian residents with New Zealand property, the bright-line test may apply if the property is residential and sold within the relevant period. This is separate from Australian CGT rules. An Australian resident selling New Zealand property may owe New Zealand bright-line tax (if applicable) and Australian CGT on the same gain, with credit mechanisms available to reduce double taxation.

Critically, the bright-line test does not apply to commercial property, rural land (subject to certain exceptions), or property held longer than the bright-line period. Understanding whether your New Zealand property falls within the bright-line test is essential for tax planning.

Superannuation and KiwiSaver Interaction

Australian superannuation and New Zealand KiwiSaver are the respective retirement savings vehicles in the two countries. The DTA treats both as pensions.

A critical provision: there is a Trans-Tasman Portability Agreement that allows New Zealand residents and KiwiSaver members to transfer KiwiSaver balances to Australian superannuation under specific circumstances. This can occur when a New Zealand resident moves to Australia and becomes an Australian resident. However, this is not automatic; specific conditions must be met (including employer sponsorship in some cases).

If a transfer occurs, the KiwiSaver balance is rolled into Australian super and treated as a super contribution. The transfer is not taxable in either country (it is a direct transfer, not a distribution and re-contribution).

If no transfer occurs, a KiwiSaver member moving to Australia retains their KiwiSaver account in New Zealand. Contributions may continue (if the person remains a New Zealand tax resident), and distributions are taxable when received.

For Australian residents with New Zealand KiwiSaver, the treatment is similar: KiwiSaver is treated as a foreign pension, and distributions are taxable in Australia when received.

Planning around super and KiwiSaver is important for Trans-Tasman expats, particularly when relocating between countries.

Practical Scenarios

Scenario 1: New Zealand Expat in Australia with Australian Property. Sarah is a New Zealand citizen living in Melbourne on a skilled migration visa. She is an Australian resident for tax purposes. She purchased an apartment in Sydney for AUD 600,000 as an investment property, generating AUD 30,000 annual rental income. She is taxed by Australia on the rental income at her marginal rate (likely 45% as a non-resident, or at her income rate if she meets the main residence exemption test—she doesn't, as it's investment property). She is also taxed by New Zealand on the same rental income as part of her worldwide income as an Australian resident (if she is classified as a New Zealand tax resident too, which depends on her days in New Zealand). If she is a dual resident, she claims Foreign Income Tax Offset in Australia for New Zealand tax paid, and foreign tax credit in New Zealand for Australian tax paid. If she is not a New Zealand tax resident (she has been in Australia more than a year and meets the test), she is taxed by Australia only on the rental income. The key is determining her tax residency in New Zealand.

Scenario 2: Australian Living in New Zealand with Australian Investment Property. James is an Australian citizen living in Auckland, working for a New Zealand company. He is a New Zealand resident for tax purposes. He owns a rental property in Brisbane, generating AUD 40,000 annual rental income. He is taxed by Australia on the rental income at the non-resident rate of 45% plus Medicare levy. He is also taxed by New Zealand on the same rental income as part of his worldwide income as a resident. He claims Foreign Income Tax Offset in Australia for New Zealand tax paid, and foreign tax credit in New Zealand for Australian tax paid. When he sells the Brisbane property in the future, he pays Australian CGT (or 12.5% FRCGW withholding if non-resident) and also reports the capital gain in New Zealand. However, New Zealand has no capital gains tax (except bright-line on residential property, which doesn't apply to Australian property), so he pays only Australian CGT. The overall tax burden is manageable due to New Zealand's lack of capital gains tax.

Scenario 3: New Zealand Resident Returning to Australia. Claire is a New Zealand citizen who worked in Australia for 10 years and has now returned to New Zealand. She owns an investment property in Melbourne purchased 8 years ago and is now selling it for a capital gain. She is now a New Zealand resident (not Australian resident). She pays Australian CGT (or FRCGW withholding) on the capital gain as a non-resident. She is not taxed by New Zealand on the capital gain (New Zealand has no capital gains tax and the bright-line test doesn't apply to Australian property). She files an Australian tax return as a non-resident reporting the capital gain and any FRCGW withheld. The overall tax burden is the Australian CGT only, which is lower than if she had remained an Australian resident.

Common Mistakes

1. Wrong Tax Residency Assumption. Many Trans-Tasman expats incorrectly assume their residency status. The difference between Australian resident and non-resident (and between New Zealand resident and non-resident) is critical to tax obligations. Professional advice should clarify your status in each country.

2. Missing Franking Credit Claims. New Zealand shareholders of Australian companies can claim Australian franking credits on their New Zealand tax return. Many fail to claim these credits and overpay New Zealand tax. Franking credit claims require documentation and must be claimed on the New Zealand tax return.

3. KiwiSaver and Superannuation Confusion. Many Trans-Tasman expats do not understand the interaction between Australian super and New Zealand KiwiSaver. The DTA treats both as pensions, but the treatment differs depending on residency and whether a transfer has occurred. Professional advice is essential for planning.

4. Main Residence Exemption Trap for New Zealand-Based Australian Property Owners. Some Australian property owners assume that if a property is their main residence, they are exempt from Australian CGT. This is true if they are Australian residents and the property is their actual main residence. However, an Australian owner living in New Zealand cannot claim the main residence exemption for Australian property (they are not in Australia to reside in it). Non-residents do not have a main residence exemption. This is a common misunderstanding.

5. Not Lodging Australian Tax Returns as a Non-Resident. Some New Zealand residents believe they don't need to file Australian tax returns because they are not Australian residents. If they earn Australian-source income (rental income from Australian property, capital gains on property sales), they must file Australian returns as non-residents. Failure to file results in penalties.

How ODIN Tax Can Help

ODIN Tax specialises in the Australian side of taxation for New Zealand nationals and Australian expats in New Zealand. We calculate Australian tax on income from Australian property, manage CGT reporting on property sales, and ensure you file Australian returns as required. We coordinate with your property structure and mortgage to optimise your overall Australian tax position.

However, New Zealand taxation is complex and requires a qualified New Zealand tax advisor. We strongly recommend you engage a New Zealand tax advisor in parallel. ODIN Tax can provide your Australian tax position and coordinate with your New Zealand advisor to ensure consistency. New Zealand tax compliance is your responsibility to arrange with a qualified New Zealand advisor.