Refinancing Rental Property Loans in NZ: An Investor's Guide

Why investors refinance

• Rate and cashback — the same reasons as homeowners, multiplied across several loans.
• Releasing equity to fund a deposit on the next property.
• Separating securities so one lender doesn't hold every property.
• Restructuring repayments — interest-only periods, or separate loans for each property.
• Preparing to sell a property without disrupting the rest of the portfolio.

Cross-collateralisation: the issue most investors don't see

When one lender holds several of your properties, it often takes all of them as security for all of your loans. That's called cross-collateralisation. It's convenient while you're building a portfolio, but it gives that lender a say over every move you make.

Refinancing part of a portfolio to a second lender is often the cleanest way to untangle this. It needs planning, because each property needs to support its own loan.

Releasing equity for the next purchase

If your properties have gone up in value or your loans have come down, you may be able to borrow against that equity for your next deposit. Lenders work out how much they'll lend against existing property using their own LVR limits for investment property, and the Reserve Bank's LVR settings require a larger deposit for investors than for owner-occupiers. Check the Reserve Bank's current settings.

Rental income is also usually counted at less than 100% when lenders assess serviceability, to allow for vacancies and costs. How much they discount it varies between lenders and is one of the main reasons a broker can find more borrowing capacity for investors. See using home equity to buy an investment property.

Tax points to check with your accountant

• Interest deductibility. For residential rental property, interest deductions were phased back in and have been fully deductible again from 1 April 2025. If you refinance to release equity, what the borrowed money is used for generally determines whether the interest is deductible — not which property secures it. Keep the purposes of each loan clearly separate.
• Bright-line test. Refinancing a property is not selling it, so on its own it doesn't trigger the bright-line test. Selling within the bright-line period might.
• Loan structure. Mixing personal and investment borrowing in one loan makes deductions harder to track. Refinancing is a good opportunity to separate them.

Inland Revenue's guidance for residential landlords is the official source. Tax settings change, so confirm the current position with your accountant.

Interest-only and repayment structure

Many investors use interest-only periods on rental loans to improve cash flow, while paying down their home loan, where interest isn't deductible, faster. Lenders limit how long interest-only terms run and reassess at the end, so plan for the switch to principal-and-interest repayments.

Splitting loans by property, and between fixed and floating, also makes it easier to sell or pay down one property without break fees on the rest.

How we help investors

We review the whole portfolio, not just the next fixed term: which lender holds which security, where equity can be released, how rental income is being assessed, and how to structure things so your next purchase or sale isn't held up by your current set-up. We work alongside your accountant on the tax side.

More on the service: investment property loans.

This article explains how New Zealand lenders generally assess these situations. It is general information, not personalised financial advice, and lender policy changes often — check your own position with a registered adviser. Official sources: Reserve Bank of New Zealand for lending policy and the OCR, and Sorted.org.nz for independent government-backed money guidance.