How long can I have an interest-only loan in NZ?

Most banks offer interest-only terms of 1 to 5 years for investment properties, though ANZ now offers up to 10 years. You can often apply to extend the interest-only period when it ends, but approval is not guaranteed and depends on your circumstances at the time.

Can I make lump sum payments on an interest-only loan?

Yes, most interest-only loans allow additional payments. These reduce your loan balance and therefore your future interest costs. Check your loan terms for any restrictions or fees.

Do interest-only loans have higher interest rates?

Generally, the interest rate is the same whether you choose interest-only or principal and interest. However, some lenders may offer discounts for principal and interest loans, so it pays to compare.

What happens if I cannot afford the payments when interest-only ends?

You should plan for this well in advance. Options include applying to extend the interest-only period, refinancing to a longer loan term, selling a property to reduce debt, or increasing your income. Talk to your lender early if you are concerned.

Interest-Only Loans for Investment Property NZ

Interest-only loans are a popular tool among property investors, but they are not right for everyone. Understanding how they work and when to use them is essential for making smart financing decisions.

When you take out an interest-only loan, your monthly repayments cover only the interest charged on the loan, not the principal. This means lower payments compared to a principal and interest loan, but your loan balance stays the same throughout the interest-only period.

How Interest-Only Loans Work

With a standard principal and interest loan, each payment reduces your loan balance over time. With an interest-only loan, you are essentially renting money from the bank. You pay for the privilege of using their money, but you are not paying it back.

Example Comparison (on a $500,000 loan at 6.5%):

Interest-only payment: $2,708 per month
Principal and interest (30 years): $3,160 per month
Monthly difference: $452 saved with interest-only
Annual difference: $5,424 in improved cash flow

This difference can be significant for investors managing multiple properties or those in growth phases of building their portfolio.

The Benefits of Interest-Only Loans

Improved Cash Flow

The most obvious benefit is reduced monthly payments. For investment properties, this can mean the difference between positive and negative cash flow, or simply having more buffer for unexpected expenses.

Tax Efficiency

Interest payments on investment property loans are fully tax-deductible. By maximising interest payments and minimising principal repayments on investment debt, you may be able to optimise your tax position. Many investors prefer to pay down non-deductible debt (like their home loan) first.

Flexibility for Portfolio Growth

The extra cash flow can be directed toward saving for your next deposit, covering holding costs during renovations, or building cash reserves for opportunities that arise.

The Drawbacks and Risks

No Equity Build-Up Through Repayments

The biggest downside is that you are not reducing your loan balance. Any equity growth comes solely from property value increases, not from paying down the loan. If property values fall or stagnate, you could find yourself in a difficult position.

Higher Payments Eventually

When the interest-only period ends, your payments will jump significantly because you need to repay the full principal over a shorter remaining term. A $500,000 loan that was interest-only for 5 years will need to be repaid over 25 years instead of 30, meaning higher monthly payments.

Payment Shock Example:

A $500,000 loan at 6.5% goes from $2,708/month (interest-only) to $3,406/month (principal and interest over 25 years). That is a 26% increase in payments, which can strain your cash flow if you are not prepared.

Lending Restrictions

Banks assess your ability to repay on a principal and interest basis, even if you are applying for interest-only. This means you may not be able to borrow as much as you think. Lenders also have limits on how long they will offer interest-only terms—most banks offer 1 to 5 years, though ANZ now offers up to 10 years for investment properties. Extensions are possible but not guaranteed.

When Interest-Only Makes Sense

Good Candidates for Interest-Only:

☐ You have non-deductible debt (home loan) to pay off first
☐ You are actively building a portfolio and need cash flow for deposits
☐ The property is negatively geared and you need to reduce holding costs
☐ You have a clear plan for when and how you will transition to principal and interest
☐ You are renovating and need reduced payments during the project

When to Avoid Interest-Only:

☐ You have no plan for how to handle the payment increase later
☐ You are close to retirement and need to reduce debt
☐ You are using it just to buy a more expensive property than you can afford
☐ The extra cash flow will just be spent rather than strategically deployed

Strategies for Using Interest-Only Effectively

Debt Recycling

Use interest-only on investment loans while aggressively paying down your home loan. Once your home is paid off, you can redirect that cash flow to start paying down investment debt. This maximises tax efficiency while still building equity.

Offset Accounts

Some investors maintain an offset account against their interest-only loan. The cash in the offset reduces the interest charged, but remains accessible. This gives you the benefits of interest-only while still having funds working to reduce your interest costs.

Regular Reviews

Do not just set and forget your interest-only arrangements. Review annually to ensure they still make sense for your situation. As your portfolio matures or your home loan reduces, the optimal strategy may change.

Talking to Your Lender

When applying for or renewing interest-only terms, be prepared to demonstrate your strategy. Banks want to see that you understand the risks and have a plan. They may ask about your exit strategy, your overall debt position, and your income trajectory.

Most banks allow you to switch between interest-only and principal and interest during the loan term, though there may be fees or restrictions. A good mortgage broker can help you structure your loans to maintain flexibility.

The Bottom Line

Interest-only loans are a tool, not a strategy in themselves. Used wisely, they can improve cash flow, enhance tax efficiency, and accelerate portfolio growth. Used poorly, they can leave you with a mountain of debt and no clear path to paying it off.

The key is having a clear plan: know why you are using interest-only, how long you will use it, and what you will do when the interest-only period ends. With that clarity, interest-only loans can be a valuable part of your property investment toolkit.