Buying an investment property in NZ: the 2026 basics

Examples are illustrative: a $700,000 property, 30% deposit, 5.5% interest-only, rent at a 3.9% gross yield, and $6,000 a year of other costs. I’m not an accountant, so check tax with yours.

Most people who ask me about buying an investment property have the same three questions. How much do I need, can I use my own home, and will it pay for itself? Here’s the checklist I run through.

The deposit for buying an investment property

The RBNZ limits how much banks can lend at high LVRs. Investors get the tighter limit: banks can lend only 10% of new investor lending above 70% LVR. In practice, that means roughly a 30% deposit.

New builds are different. Buying a new build from the developer within 6 months of completion is exempt from LVR, and so are construction loans. If that’s an option, ask about it. The detail on how investor loans are structured is on my property investment loans page.

Using the equity in your home

If you own your home, you may not need 30% in cash. Your lender can lend against the equity in your home to fund the deposit on the investment. On a $700,000 purchase, 30% is $210,000. Whether your home can cover that depends on its value and what you still owe. I explain how it works in using home equity.

One warning. Some banks want to link all your properties together as security. I’d think twice before agreeing, and I’ve explained why in letting banks link your properties.

Debt-to-income and what the property must earn

Banks can lend only 20% of investor lending at a debt-to-income ratio (DTI) above 7. DTI is your total debt plus the new loan, divided by your gross annual income. Credit card limits count, not balances. Rental income counts for investors. DTI applies to banks, not non-banks.

Gross yield is rent as a percentage of price. Cotality’s national figure was 3.9% in March 2026, the highest since 2015. Here’s what that means on a $700,000 property, with the maths done:

That’s before any tax effect. Plenty of investors top up a shortfall like this for years, so I’d want you to be comfortable carrying it. An interest-only loan keeps repayments down, but you’re not paying off the debt.

Tax and rules when buying an investment property

• Interest: 100% deductible from 1 April 2025 (it was 80% the year before).
• Bright-line: 2 years for residential property sold on or after 1 July 2024. The clock usually starts when title transfers to you and stops when you sign a binding sale agreement. The main-home exemption can apply.
• Ring-fenced losses: rental losses carry forward against future residential rental income. You can’t offset them against your salary.
• Healthy Homes: private rentals had to comply by 1 July 2025. Penalties run up to $7,200 for smaller landlords and $50,000 for landlords with 6 or more properties.

Your accountant should confirm how these apply to you.

Before you make an offer

1. Work out your deposit and where it comes from.
2. Get your DTI checked, including any card limits.
3. Run the cash-flow numbers on the actual rent and rates.
4. Ask your accountant about tax.
5. Check the property meets Healthy Homes.
6. Keep your loans separate where you can.

Common questions

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This article is general information only and isn’t personalised financial advice. Figures are illustrative and based on the assumptions shown. Mortgage Sense is a trading name of Yatin Kainth, a Financial Adviser (FSP1007497) providing advice under the Mortgage Managers licence (North West Group Holdings Ltd, FSP682791). See the Disclosure Statement.