Hopping the Ditch? Don't Leave Your Tax Debt Behind

By Daran Nair of Greenlane CA Limited

New Zealanders who are hopping across the ditch to Australia must ensure all their tax debts are paid, failing which the Inland Revenue Department (IRD) will be able to use the Australian Taxation Office (ATO) to collect the debt.

For decades, a long-standing legal principle known as the “Revenue Rule” meant that the courts of one country would simply refuse to enforce the tax laws of another. If you owed money to the IRD and moved to Sydney or Melbourne, that debt effectively stopped at the border. But those days are well and truly over.

Thanks to a robust bilateral agreement between New Zealand and Australia, the Tasman Sea is no longer a safe haven for unpaid taxes. The two nations have established a highly integrated system that turns the ATO into a debt collector for the IRD, and vice versa.

The Treaty That Changed the Game

The foundation of this cross-border crackdown is the 2009 Double Tax Agreement (DTA) between Australia and New Zealand. Tucked away in Article 27 of this treaty is a powerful provision titled “Assistance in the Collection of Taxes.”

This article mandates that both countries must help each other collect “revenue claims.” This doesn't just mean the core tax you owe; it also includes any interest, administrative penalties, and the costs of chasing you down.

The mechanism is surprisingly straightforward. When a New Zealand tax debt becomes legally enforceable – meaning you have exhausted or missed your chances to dispute it – the IRD can formally request the ATO to take over the collection. Once the ATO accepts the claim, they are legally obligated to treat your New Zealand tax debt exactly as if it were an Australian tax debt.

How the Trap Springs Shut

A recent case before the New Zealand Taxation Review Authority (A v CIR [2026] NZTCRA 6) perfectly illustrates how this trap springs shut on unsuspecting expats.

In this case, a taxpayer who had relocated to Australia found herself in a dispute with the IRD over her 2014 to 2016 income tax years. The IRD issued a formal Notice of Proposed Adjustment (NOPA), outlining the shortfall penalties and taxes owed. Under New Zealand's strict tax laws, taxpayers have exactly two months to issue a Notice of Response (NOR) if they wish to fight the assessment.

The taxpayer missed this crucial deadline. By failing to engage with the mandatory disputes process in time, the IRD's assessments were deemed legally accepted. The debt became final and enforceable.

Because she could no longer prevent the collection of the debt under New Zealand law, the IRD was free to invoke the treaty. On 19 July 2024, the taxpayer received a nasty shock: a notice from the ATO advising her that a “foreign revenue claim” had been registered against her name.

The Australian Machinery

When the IRD sends a debt across the ditch, the Australian machinery kicks into gear under Division 263 of their Taxation Administration Act 1953.

The ATO enters the details into their Foreign Revenue Claims Register. The moment that happens, the New Zealand debt undergoes a legal transformation – it instantly becomes a pecuniary liability owed directly to the Australian Commonwealth.

The ATO will then serve you with a notice. You have 30 days to pay up. If you don't, Australian general interest charges start piling onto the debt. Worse still, the ATO can unleash its full arsenal of domestic recovery tools against you. This includes issuing “garnishee notices,” which allow them to legally raid your Australian bank accounts or siphon money directly from your Australian wages to pay off the IRD.

Crucially, you cannot run to an Australian court to argue that the original New Zealand tax bill was wrong or unfair. The treaty explicitly bans Australian courts from hearing disputes about the validity or amount of the foreign tax. If you want to fight the IRD, you have to do it in New Zealand, under New Zealand rules.

A Two-Way Street

Of course, this is a two-way street. If an Australian resident flees to Auckland or Wellington leaving an ATO debt behind, the IRD will return the favour.

Under Part 10A of New Zealand's Tax Administration Act 1994, the Commissioner of Inland Revenue is granted the exact same powers to recover an Australian tax debt as they have for recovering unpaid New Zealand taxes. The IRD can issue deduction notices to your Kiwi employer or bank to satisfy the ATO's claim.

The Bottom Line

The message for anyone planning a move across the Tasman is clear: sort out your tax affairs before you pack your bags.

The historical loophole that allowed migrating taxpayers to outrun their obligations has been firmly closed. With the IRD and the ATO acting as reciprocal debt collectors, an unpaid tax bill in one country will inevitably catch up with you in the other.

Contact Greenlane CA Limited

• Email: info@glca.co.nz

• Phone: +64 9 522 5182

• Website: www.glca.co.nz

• Address: 97 Great South Road, Greenlane, Auckland 1051

Disclaimer

This newsletter is published by Greenlane CA Limited for informational purposes only. The content provided herein is of a general nature and does not constitute professional tax, accounting, legal, or financial advice. While every effort has been made to ensure the accuracy and completeness of the information contained in this newsletter, Greenlane CA Limited makes no representations or warranties, express or implied, as to the accuracy, reliability, completeness, or currency of the information.

Readers should not act or refrain from acting based solely on the information in this newsletter without first seeking professional advice tailored to their specific circumstances. Tax laws and regulations are subject to change, and the application of these laws depends on the particular facts and circumstances of each case.

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For advice specific to your situation, please contact Greenlane CA Limited directly.