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Investors · Nelson, Nelson/Tasman

Interest Deductibility at 100% — One Year In

Last updated: July 2026

24 Feb 2026 Mia Rossi 6 min read

This Week at a Glance

"It has been precisely twelve months since the comprehensive reinstatement of 100% mortgage interest deductibility for residential property investors. The policy reversal has profoundly altered the operational mathematics for landlords across New Zealand. In tightly held markets like Nelson and the broader Tasman region, the removal of this shadow tax has resulted in an 18% year-on-year spike in investor pre-approval applications. Yield-focused buyers are actively rotating capital away from commercial syndicates and term deposits back into standalone residential housing. The ability to offset debt servicing costs directly against rental income has restored the viability of highly leveraged portfolio expansion strategies."

Key Metric · Week 8
Investor Apps
+18% YoY

What This Means for Your Mortgage

For investors, every rate and policy shift runs through two filters: debt-to-income caps and rental income treatment, both of which vary meaningfully by lender. A change that looks minor on the surface can move your effective borrowing capacity by a lot once those two filters are applied.

Check your own numbers with our DTI ratio calculator, or book a call if you're weighing up a purchase in Nelson against your current portfolio structure.

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