If you’re an Australian resident investing in rental property across the Tasman, there’s a New Zealand tax rule that may surprise you — the thin capitalisation rules.
While these were originally introduced to prevent large international companies from over-funding their NZ operations with debt, Inland Revenue has confirmed they also apply to non-resident individuals.
That means if you’re an Australian investor who owns a rental property in New Zealand (for example, in Queenstown or Auckland) and your borrowing is more than 60% of the property’s value, you could face restrictions on your interest deductions for New Zealand tax purposes.
Why This Matters for Australian Property Investors
For many Australians investing in New Zealand property, gearing above 60% is perfectly normal — it’s simply how property investment works. However, the Inland Revenue’s recent confirmation means these investors are caught under the same thin capitalisation regime as multinational companies.
Under section FE 2(1)(a) of New Zealand’s Income Tax Act 2007, non-resident individuals fall within scope of the thin capitalisation rules. The safe harbour threshold allows total debt of up to 60% of the value of your New Zealand assets. If your borrowing exceeds that level, a proportion of your interest expense could become non-deductible.
Key Points to Understand
- Yes, the rules apply to individuals – not just companies or trusts. Inland Revenue has confirmed this directly.
- The 60% safe harbour: You can generally deduct interest if your total NZ debt is less than 60% of your NZ assets (property and other investments).
- If you exceed 60%, you’ll need to calculate the allowable interest under section FE 6. Some of your interest may no longer be deductible.
- Your “New Zealand group” must be identified under section FE 3 — this includes any property or investments you control in New Zealand.
- Even one rental property can be enough to trigger the thin capitalisation rules if it’s highly geared and you’re non-resident.
For example, if you buy a NZ rental property for NZD 1 million using an NZD 700,000 loan, your debt ratio is 70%. This breaches the 60% safe harbour, meaning part of your interest may be disallowed when calculating NZ taxable income.
What Australian Investors Should Do
- Check your debt-to-asset ratio for each NZ investment. If you’re above 60%, review your interest deductions.
- Keep proper valuations and loan documents — Inland Revenue may ask for evidence of your asset values and financing arrangements.
- Understand how this affects your NZ tax return — you may need to make adjustments if part of your interest isn’t deductible.
- Coordinate your Australian and NZ tax positions — what’s deductible in NZ may not match your Australian treatment, so you want to avoid mismatches or double taxation.
- Get NZ-specific advice — The thin capitalisation rules are detailed and easily overlooked by Australian accountants unfamiliar with NZ tax law.
Our Insight
At NZ Tax Accountants Pty Ltd, we work exclusively with Australian residents who own or plan to buy property in New Zealand. Because we understand both systems, we can help you stay compliant with NZ’s thin capitalisation and rental income rules — without the confusion or risk of unexpected tax bills.
The thin capitalisation regime may seem aimed at big corporations, but it’s now part of the landscape for individual overseas investors too. If your New Zealand rental property is highly geared, it’s essential to understand how this could impact your NZ tax deductions.
If you’re an Australian investor with New Zealand rental property, now’s the time to review your debt levels and ensure you’re within the 60% safe harbour.
Contact NZ Tax Accountants Pty Ltd today — our team of Australian-based New Zealand tax specialists can help you assess your position and keep your NZ rental investments compliant.
The information in this article is indicative of NZ tax rules and changes and not intended to be complete for all intents or purposes and does not constitute advice. It is recommended that you obtain professional advice, suited to your particular circumstances, from us before acting on anything you read.