NZ Rental Loss Ring-Fencing 2026: Why Restructuring Won't Help (And What Will)
As a portfolio builder, maintaining a strategic edge is paramount to maximising your long-term wealth. In an ever-evolving tax environment, clarity isn't just about compliance - it's about turning tax rules into tools for asset growth.
This guide focuses on three topics that are either new, widely misunderstood, or both: the full restoration of interest deductibility, how ring-fencing actually works (and why restructuring won't get you around it), and how to approach chattel depreciation strategically rather than just listing items. For a full breakdown of day-to-day deductible expenses, see our Rental Property Expenses guide.
1. Interest Deductibility — Fully Restored From 1 April 2025
The headline change most investors have been waiting for is now in effect.
From 1 April 2025, mortgage interest is 100% deductible for residential rentals. For a portfolio with significant lending, this shift is critical for return on investment. Ensure your detail-oriented review includes these previous years' claim rates to verify you haven't missed valid deductions:
- 2023/24: 50% deductible
- 2024/25: 80% deductible
- 2025/26 onwards: 100% deductible
If you have a $600,000 mortgage at 6%, that's $36,000 in interest now fully back on the table as an expense.
Two things worth checking before you move on:
First, if your 2023/24 or 2024/25 tax returns didn't correctly claim the 50% and 80% deductions respectively, those returns may be worth reviewing. It's a surprisingly common gap.
Critical attention is required for mixed-use situations; interest on borrowing with any private-use component must be correctly split. In a professional portfolio, accuracy in these splits is a non-negotiable legal requirement.
For more on how interest deductibility interacts with your overall expense claims, see our Smart Tax Tips for Landlords.
2. Ring-Fencing - And Why a Legal Structure Won't Solve It
A common misconception is that a different legal structure can bypass these rules. We confirm that restructuring into a company or trust will not grant the ability to deduct residential rental losses against other income. Instead, your structure should remain focused on long-term wealth preservation, managing Bright-line tax liability, and estate planning.
- Individual owners: ring-fenced ✗
- Trusts: ring-fenced ✗
- Companies: ring-fenced ✗
- Look-through companies (LTCs): losses flow through to the shareholder, but remain ring-fenced at the individual level ✗
- Partnerships: ring-fenced at each partner level ✗
IRD closed these doors deliberately. Wrapping a residential rental in a company or trust does not make those losses freely deductible against other income. If you've heard otherwise, it's worth getting advice specific to your situation.
Where ring-fencing genuinely does NOT apply
There are real exceptions, but they require a genuine change in the nature of the activity, not just the ownership structure:
Commercial property. Ring-fencing is a residential-only rule. Losses from commercial rental properties can offset other income without restriction. This is one reason some investors deliberately hold a commercial property in their portfolio.
Property traders and developers. If someone is genuinely in the business of buying and selling property - as a property business - their activities may fall outside the rental ring-fencing rules entirely. The losses from a property trading business are standard business losses. However, this is a high bar. IRD will look at frequency of transactions, intent at purchase, and scale of activity. You cannot simply declare yourself a developer; the facts need to support it.
GST-registered short-stay accommodation. If a property is used predominantly for short-term rental (Airbnb-style) and the owner is GST-registered as part of a business activity, it may be characterised as a business rather than passive rental. This does not apply to standard long-term residential tenancies.
Mixed-use assets (e.g., a bach). Properties used partly privately and partly for income fall under separate mixed-use asset rules (subpart DG), not the standard ring-fencing provisions. The calculations differ, though loss restrictions still apply.
The portfolio offset rule - the most practical relief
While ring-fenced losses can't offset salary or business income, they can offset rental profits from other residential properties in the same portfolio within the same year. If you own four properties and one runs at a loss, that loss can reduce taxable profit from the other three. Accumulated losses also carry forward indefinitely.
This means your pool of carried-forward ring-fenced losses is a genuine asset. We regularly see investors who don't realise how many prior-year losses are sitting in their tax history - losses that will reduce future tax bills once properties become profitable. Make sure your accountant is tracking these carefully.
3. The Hidden Asset: Maximising Immediate Cash Flow with Strategic Claiming Tax Back on Fittings
While you can't depreciate a residential building itself (the depreciation rate has been 0% since 2011), the fittings and fixtures inside your property are a different matter. Items like heat pumps, carpets, curtains, and kitchen appliances all have their own IRD-approved depreciation rates and can be claimed each year.
Our Smart Tax Tips for Landlords blog covers the full list of depreciable fittings and fixtures. What we want to focus on here is the part that often gets missed: the valuation process and why timing matters.
Why you need a fitting and fixture valuation
When you buy a rental property, the purchase price covers land, building, and fittings and fixtures as a single bundle. To claim fitting and fixture depreciation, each item needs to be valued individually at the time of purchase by a registered valuer. Without this, you can't prove your claims — and you lose the benefit entirely.
The valuation cost is modest (typically a few hundred dollars), and it pays for itself quickly. On a $750,000 property, a fitting and fixture valuation commonly identifies $40,000–$70,000 worth of depreciable items. Depreciated at the applicable IRD rates, that translates to several thousand dollars of additional tax deductions per year.
What if you never got one?
Many investors who bought properties years ago never had a fitting and fixture valuation done. In some cases a retrospective valuation is still possible, but the window and methodology depend on the circumstances. If this is your situation, it's worth a conversation with us to see what's still achievable.
New from May 2025: The Investment Boost
From 22 May 2025, a new Investment Boost deduction allows you to claim 20% of the cost of new depreciable assets upfront, with the remainder depreciated normally. So a $5,000 heat pump purchased for your rental generates a $1,000 immediate deduction, plus ongoing depreciation on the remaining $4,000. This stacks on top of your regular chattel depreciation and is worth factoring into any decisions about property upgrades.
Pre-31 March 2026 Checklist
Prior to the end of the tax year, we recommend these proactive reviews to ensure your portfolio is set up to maximize your wealth:
- Your 2025/26 return is claiming 100% of mortgage interest: this is the first full year of restored deductibility.
- Your 2023/24 and 2024/25 returns correctly claimed 50% and 80% respectively: review these if there's any uncertainty.
- Your ring-fenced loss pool is being tracked: accumulated losses are valuable and should appear in your tax history each year.
- Your fittings and fixtures are on a depreciation schedule: if you've never had a fitting and fixture valuation, assess whether one is still possible.
Your ownership structure is still right for your situation: not to get around ring-fencing (it won't), but because structure affects Bright-line exposure, income splitting, and estate planning.
How Business Like NZ Can Help
We're a South Auckland-based accounting firm and we work with property investors every day. Our team have been property investors themselves - so we understand this isn't just abstract tax theory, it's your financial future.
Our services for rental property owners include:
- Annual financial accounts and rental tax returns
- Chattel depreciation schedules and chattel valuation coordination
- Ring-fenced loss tracking and tax position reviews
- Bright-line test advice and IR833 return preparation
- Ownership structure reviews and restructuring advice
- Annual tax review meetings to keep you across the numbers
This guide is for general information purposes. Tax rules can be complex and your situation may differ. Please speak with a qualified accountant before making decisions based on this content.