Property investment remains one of New Zealand's most popular wealth-building strategies. But the rules have changed significantly in recent years — and getting the finance right is more complex than it used to be.
Here's what first-time investors need to understand before they start.
How Much Deposit Do You Need?
Investment property lending sits in a different category from owner-occupied lending. The Reserve Bank's loan-to-value ratio (LVR) rules currently require a minimum 35% deposit for most investment properties.
That means if you're buying a $700,000 rental property, you'll need at least $245,000 in equity or cash.
There are some exceptions — for example, new build investment properties can attract different LVR treatment. Talk to a mortgage adviser about your specific situation.
How Do Lenders Assess Rental Income?
Banks don't count 100% of your expected rental income. Most lenders apply a rental shading — typically 70–75% of gross rent. This accounts for vacancy periods, maintenance costs, and property management fees.
So if a property rents for $600/week, a lender might credit you with roughly $420–$450/week of income when calculating your servicing capacity.
Some banks have their own test rates and stress tests on top of this. The borrowing capacity for investment lending is meaningfully tighter than for your own home.
Interest Deductibility: What Investors Need to Know
New Zealand's interest deductibility rules for residential investment properties have gone through significant changes. From 1 April 2024, the deductibility rules changed again for existing rentals.
Key points as of 2026:
- Interest on new build investment properties: generally deductible in full
- Interest on existing rental properties: phased back in — check the IRD website for the current rules and applicable percentages
- Bright-line rules: properties sold within the relevant bright-line period may trigger an income tax liability
Tax rules in this area are complex and updated regularly. Always get advice from a qualified tax professional or accountant before purchasing an investment property.
Building Equity Through Your Owner-Occupied Home
Many investors use equity in their existing home as the deposit for an investment property — rather than cash savings. Here's how it works:
- Your home is worth $900,000 and you owe $450,000 — you have $450,000 in equity
- A bank may allow you to borrow up to 80% of your home's value ($720,000)
- You could access $270,000 of "usable" equity ($720,000 - $450,000) to use as a deposit
- That $270,000 can fund most or all of a 35% deposit on a $700,000 investment property
This structure — cross-collateralising your home and investment property — has pros and cons. A mortgage adviser can help you structure this in the most flexible way possible.
Getting the Structure Right
How you structure your investment mortgage matters for both tax and flexibility:
- Interest-only vs principal + interest — Interest-only loans are common for investment properties, as they maximise cash flow and the principal isn't tax-deductible anyway
- Separate loan accounts — Keep investment lending separate from your owner-occupied home loan for clean record-keeping
- Entity vs personal name — Some investors hold property in a look-through company (LTC) or trust; this has implications for lending and tax
Ready to Invest?
Property investing in New Zealand is still viable — but it requires more planning and structuring than it did a decade ago.
Nexa Mortgages & Finance works with property investors to structure lending that maximises flexibility, manages risk, and sets you up for the long term.
Get in touch today to discuss your investment goals.