Property Investment
Mortgage rates have stopped rising … but for how long?
See how interest rates are shifting, the lowest rates available, and how much you could negotiate right now.
Mortgages
14 min read
Author: Peter Norris
Mortgage broker for over 10 years, property investor and Managing Director at Opes Mortgages
Reviewed by: Ed McKnight
Resident Economist, with a GradDipEcon and over five years at Opes Partners, is a trusted contributor to NZ Property Investor, Informed Investor, Stuff, Business Desk, and OneRoof.
Mortgages are complicated. Not only are they the most significant financial purchase of your life – very little seems black and white.
There are few hard and fast rules, and when you do learn of one, there's always another it turns out you didn't know about.
Don't worry, we've got you.
This 10,000-word guide contains everything you need to know to get a basic understanding of home loans ... how to get one, and then how to pay it off faster.
Here's a quick video from Ed, one of the co-authors of the guides, introducing what you'll learn here:
| In this guide | What you will learn |
| Mortgage basics | The different mortgage types and how they work |
| Borrowing money | How much deposit you need and how much you can borrow |
| Interest rates | How to choose between fixed and floating rates |
| Getting approved | What banks look for and why applications get declined |
| Paying off your mortgage | Ways to reduce interest costs and manage your debt |
If you’re new to investing, start with our property investment guide.
Otherwise, let’s start with the basics.
Getting approved for an investment property mortgage is only half the job. How you structure your loan can make a big difference to what your property costs you each week.
Over the next 30 minutes or so, this guide will show you:
By the end of this guide, you'll feel confident knowing your next steps to get your mortgage application approved.
There are three common mortgages used in New Zealand:
| Mortgage type | How repayments work | Why an investor might choose it |
| Table mortgage (principal and interest) | Each payment covers some interest and pays off some of what you borrowed. | You want to reduce your debt over time. |
| Interest-only mortgage | You only pay interest. You don’t pay back any of the money you borrowed. | You want to pay less towards the mortgage each week. |
| Revolving credit | Works like an overdraft. You can pay money back, then borrow it again when you need it. | You want flexibility to manage cashflow and reduce interest costs. |
You can also split your mortgage between different loan types.
We’ll explain how these mortgage types can save you money later in this guide. Plus, we’ll cover the benefits, downsides and risks of each.
Just because you have enough deposit to buy an investment property it doesn’t mean the bank will lend you the money.
That’s because banks look at three primary things when deciding how much you can borrow:
| What banks check | What it means |
| 1. Deposit or equity | Do you have enough deposit? |
| 2. Debt-to-income ratio | Do you have too much debt compared to your income? |
| 3. Your income and expenses | Can you afford the mortgage repayments? |
You need to pass all three checks.
But these aren’t the only things the bank checks. For instance, they’ll also look at your credit score. After all, they want to make sure you actually pay your bills on time.
Let’s go through the main checks:
The Reserve Bank sets rules about how much deposit you need. These are called LVR rules.
As a general rule investors need a 30% deposit to buy an existing investment property.
But if you’re buying a New Build you can often buy with a 20% deposit.
Here’s what that looks like:
| Property type | Typical deposit | Deposit on a $700,000 property |
| Existing investment property | 30% | $210,000 |
| New Build | 20% | $140,000 |
| Owner-occupied home | 20% | $140,000 |
Remember, these are general guidelines.
Some banks might let you buy with a smaller deposit.
While investors usually need a 30% deposit, there are some exceptions.
In December 2025, the Reserve Bank changed its Loan-to-Value Ratio (LVR) rules.
Banks can now give more mortgages to investors who have smaller deposits. The limit has doubled from 5% to 10% of their new investor lending.
This means more investors might be able to buy with a smaller deposit.
So there are options if you want to purchase an investment property with a lower deposit:
| Option | How it works |
| Buy a New Build | The deposit rules don’t apply to New Builds. |
| Use a bank’s high LVR allowance | Some banks will let investors buy with a smaller deposit. |
| Use equity | Some investors can use equity from a property they already own to secure the deposit, instead of using cash savings. |
| Use a non-bank lender | Some lenders have different deposit rules, but may charge a higher interest rate. |
You might be able to use the equity you have in another property instead of a cash deposit.
Equity is the difference between what your property is worth and what you owe on it.
For example:
| Amount | |
| Property value | $900,000 |
| Mortgage | $500,000 |
| Total equity | $400,000 |
You can’t usually use all your equity. The part you can use is called usable equity.
You can estimate yours using our usable equity guide.
You then borrow against the usable equity in your other property, and use that money as the deposit for your new one.
But even if you have enough for a deposit, the bank still needs to look at how much you earn and owe.
That’s our next test.
Even if you have enough deposit, the bank might still say ‘no’.
That’s because of Debt-to-Income (DTI) restrictions.
DTI compares how much you owe with how much you earn each year.
Since July 2024, there have been limits on how much you can borrow compared with what you earn.
Here are the standard limits:
| Borrower | DTI threshold (usual borrowing limit) |
| Owner-occupier | 6 times annual income |
| Property investor | 7 times annual income |
Banks can make some exceptions to these limits. Some loans, including New Builds, are exempt.
Let’s say you earn $150,000 a year before tax.
You also receive $40,000 a year in rent from an investment property.
Here’s how the numbers work:
| Amount | |
| Salary | $150,000 |
| Rental income | $40,000 |
| Total income | $190,000 |
| Investor limit (7x income) | 7 |
| Total amount you could owe | $1,330,000 |
| Mortgage you already have | $500,000 |
| How much more you could borrow | $830,000 |
In this example, the DTI rules would let you borrow up to another $830,000.
But that doesn’t mean the bank will lend you that much.
The bank still needs to check whether you can afford the repayments.
For more detail, read our guide to DTI restrictions.
DTI stands for Debt-to-Income Ratio. It compares your total debt with your annual income.
For example, if you earn $100,000 and owe $500,000, your DTI is 5
The final test is whether you can actually afford the mortgage.
Banks call this servicing.
The bank looks at how much you earn, how much you spend and what you already owe.
But here’s the catch:
The bank doesn’t just check whether you can afford today’s interest rates.
It also checks whether you could afford the mortgage if rates went up.
Banks use a higher interest rate to check whether you could afford the mortgage even if rates went up. This is called a servicing test rate.
For example, you might apply for a $500,000 interest-only mortgage at 5%.
But the bank might check whether you could afford a 7% interest rate, while also paying off the loan over 25 years.
Here’s the difference:
| Your proposed mortgage | Bank’s servicing test | |
| Mortgage | $500,000 | $500,000 |
| Interest rate | 5% | 7% |
| Repayment type | Interest-only | Principal and interest |
| Weekly repayment | $481 | $815 |
That’s a difference of $334 a week.
Even though you expect to pay $481 a week, the bank wants to know if you could afford the higher repayments.
A servicing test rate is a higher interest rate banks use to check whether you could still afford your mortgage if rates increased.
It's not necessarily the interest rate you'll actually pay.
Banks usually won’t count all the rent you receive.
That’s because you might have costs to pay or times when you don’t have a tenant.
This is where the banks will give your rent a ‘servicing haircut’.
For example:
| Amount | |
| Weekly rent | $600 |
| Percentage counted by bank | 75% |
| Rent counted for servicing | $450 |
In this example, the bank gave the annual rent a 25% servicing haircut. This is to account for those additional costs of owning a property.
Keep in mind this is just an example; each bank works it out differently.
Even though you get $600 a week in rent, the bank might only count $450.
So, you may think you can afford the mortgage, but the bank might disagree.
And it explains why one bank might lend you more than another.
Let’s say you want to buy an investment property.
You have usable equity you can use as a deposit, and you can afford the mortgage. However, taking on the new loan would mean your debt is worth more than 7x your income.
Here’s what could happen:
| Bank’s test | Your situation | Result |
| 1. Deposit or equity | You have enough deposit. | Pass |
| 2. DTI | Your debts are more than 7x your income. | Doesn't meet standard threshold |
| 3. Servicing | You could afford the higher repayments the bank tests you on. | Pass |
In this example you have enough equity and can afford the repayments.
But you have too much debt compared to what you earn.
The bank might still say ‘yes’ because it can make some exceptions, but there’s no guarantee.
That’s why having enough deposit doesn’t automatically mean you can get another mortgage.
You need to consider all three tests when working out how much you can borrow.
When you get a mortgage you will usually choose between a fixed and floating interest rate.
| Fixed interest rate | Floating interest rate | |
| How it works | Your interest rate stays the same for an agreed period. | Your interest rate can change at any time. |
| Main benefit | More certainty over repayments. | More freedom to pay extra or change your mortgage. |
| Main drawback | You may face break fees if you change the loan early. | Rates are often higher and repayments can change. |
| Often suits | Investors who want predictable repayments. | Investors who need short-term flexibility. |
If you plan to keep your investment property for years, fixing your rate can make it easier to plan your costs.
You’ll know how much interest you’ll pay while your rate is fixed.
But think about your future plans too.
For example, if you plan to sell an investment property soon, you might not want to fix your entire mortgage for a long time.
That could make it harder or more expensive to pay back the mortgage once you sell.
Some investors fix parts of their mortgage for different lengths of time; others leave part of it on a floating rate.
It depends on how much you can afford and what you plan to do next.
There are two main types of lenders: banks and non-bank lenders.
| Lender | What to know |
| Banks | Often have lower interest rates, but have stricter rules about who they lend to. |
| Non-bank lenders | May lend to people who don’t qualify for a main bank mortgage, but they often charge higher interest rates and fees. |
Some of New Zealand’s main banks include ANZ, ASB, BNZ, Kiwibank and Westpac. There are also smaller banks.
Some of NZ’s non-bank lenders include Basecorp Finance, Avanti Finance, Liberty Financial and Pepper Money.
You can approach lenders yourself or use a mortgage adviser.
A mortgage adviser helps you find a bank and apply for a mortgage.
They can compare interest rates, explain what different banks look for, and help you set up your mortgage.
This can be especially useful for property investors.
That’s because the bank offering the lowest interest rate isn’t necessarily the bank that will lend you the most money.
For example, one bank might count more of your rental income than another.
One bank might also lend you more than another if you already own several properties.
An adviser can help you understand those differences before you apply.
Banks often pay mortgage advisers for bringing them customers. However, some advisers do charge fees, so it’s worth asking upfront.
When you apply for a mortgage the bank will ask for information about you, your finances and the property you want to buy.
The application process changes depending on which bank or mortgage broker you use … but they all pretty much want the same information.
For example, at Opes Mortgages our team uses an online tool called Trail. It takes you through each step of the application and gives you one place to upload all the documents you need.
Here’s what you’ll usually need to provide:
| What the bank asks about | What you will need to show |
| You | Your name, contact details and who you’re buying with |
| The property | What you’re buying, its price and how much you want to borrow |
| What you earn | Your pay, rent and any other money coming in |
| What you spend | Food, bills, transport and other regular costs |
| What you own | Savings, investments and other properties |
| What you owe | Mortgages, credit cards and other loans |
You will usually need to show your payslips, bank statements and how much you already owe.
If you already own a property, the process is similar.
But there are a few extra things the bank will consider.
| What changes | Why it matters |
| Your existing properties | The bank needs to know their value and how much you owe. |
| Where your deposit is coming from | You may use equity as the deposit instead of cash. |
| Your rental income | The bank might only count some of the rent you receive. |
| Your existing mortgages | The bank needs to know whether you can afford all your mortgages. |
You can learn more about using an existing property to fund your next purchase in our usable equity guide.
There are at least five common reasons banks decline mortgage applications.
| Reason | What it means |
| 1. Not enough deposit or equity | You don’t have enough deposit or equity. |
| 2. Your Debt-to-Income ratio is too high | You have lots of debt compared to your income. |
| 3. Can’t service the mortgage | The bank doesn’t think you can afford the mortgage. |
| 4. Poor account conduct | You’ve missed payments or spent more money than you had in your bank account. |
| 5. Poor credit history | You’ve missed loan payments or haven’t paid back money you owe. |
We have already covered the first three.
Let’s look at 4 and 5.
When a bank lends you money it wants to know you will make your repayments on time.
That’s why it looks at how you’ve managed your accounts.
For example, the bank might be concerned if:
These can suggest you might struggle to make mortgage repayments.
But a declined application doesn’t necessarily mean you can never get a mortgage.
You may need to spend time improving how you manage your accounts before applying again.
A mortgage adviser can help you work out what needs to change.
Banks also check your credit history.
This shows how you’ve managed debt in the past.
For example, if you haven’t paid a bill and it’s been sent to a debt collector, the bank might be concerned.
But having a poor credit history doesn’t automatically mean your mortgage application will be declined.
Check your credit report before applying, especially if you’ve missed payments in the past.
That gives you time to correct any mistakes and explain any problems to your lender.
Not every investor wants to pay off their mortgage as quickly as possible.
Some want to pay off their mortgage faster. Others want to pay less each week or save money to buy another property.
Here are five ways investors can manage their mortgages, depending on their goals.
With an interest-only mortgage you pay the interest but don’t reduce the loan balance during the interest-only period.
That means your mortgage repayment is lower each week.
For example, on a $500,000 mortgage at 5% interest:
| Principal and interest | Interest-only | |
| Weekly repayment | $619 | $481 |
| Difference | $138 less a week |
That’s $138 a week you could put towards property expenses or another investment.
But there is a trade-off.
Your mortgage balance doesn’t decrease during the interest-only period.
And when that period ends, your repayments will usually increase because you need to start paying off the loan.
The bank needs to agree to an interest-only mortgage, and it often won’t let you keep it forever.
You can compare the repayments using our interest-only mortgage calculator.
An offset account links your savings to your mortgage, so you pay less interest.
For example:
| Amount | |
| Mortgage | $400,000 |
| Savings in offset account | $30,000 |
| Mortgage charged interest | $370,000 |
At 5% interest that’s a saving of $1,500 a year, assuming your savings stay in the account.
You can still use your savings when you need them, although each bank has different rules and fees.
Revolving credit works like a large overdraft.
You can pay money into the account to reduce your debt, then withdraw it again when needed.
You only pay interest on the amount you have borrowed.
This means you can use the money when you need it, such as when a tenant moves out or something needs fixing.
But if you keep withdrawing money, your debt won’t decrease. And often revolving credits and offset accounts come with higher interest rates.
So you only save money if you have money parked in the account.
Paying a little extra each week can make a big difference over time.
For example, on a $400,000 mortgage at 5% interest over 30 years:
| Minimum repayments | Extra $50 a week | |
| Weekly repayment | $495 | $545 |
| Time to repay | 30 years | About 24 years |
| Total interest | About $373,000 | About $278,000 |
That’s around $95,000 less in interest.
Instead of paying off their mortgage faster, some investors use the value they’ve built up in one property to help buy another.
This means borrowing more money now, hoping to earn rent and make money if property prices go up.
They could then use that money to help pay off their mortgages.
But property prices don’t always go up. And the bank still needs to agree to lend you the money.
Which option you choose depends on what you want to do next. Do you want to pay off your mortgage, spend less each week, or buy another property?
Your mortgage is one of the biggest financial decisions you will make as a property investor.
And it’s not just about getting approved.
The bank you choose, your interest rate and how you pay back your mortgage can all change how much the property costs you each week.
They can also affect how much you can borrow in the future.
That’s why getting the right mortgage matters just as much as getting the mortgage approved.
Before you commit to a loan, talk to a mortgage adviser who understands property investment.
They can help you compare banks, work out how much you can borrow and choose how to pay back your mortgage.
Ready to take the next step? Talk to an Opes Mortgages adviser and find out what your options are.
OPES MORTGAGES
We specialise in property investors. We'll help you find the right lender, structure your loan properly, and give your application the best chance of approval.
Talk to an Opes Mortgage AdviserMortgage broker for over 10 years, property investor and Managing Director at Opes Mortgages
Peter Norris, a certified mortgage adviser with 10+ years of experience, serves as the Managing Director at Opes Mortgages. Having facilitated over $1.2 billion in lending for 2000+ clients, Peter is a respected authority in property financing. He's a frequent writer for Informed Investor Magazine and Property Investor Magazine, while also being recognized as BNZ Mortgage Adviser of the Year in 2018 and listed among NZ Adviser's top advisers in 2022, showcasing his expertise.
This article is for your general information. It’s not financial advice. See here for details about our Financial Advice Provider Disclosure. So Opes isn’t telling you what to do with your own money.
We’ve made every effort to make sure the information is accurate. But we occasionally get the odd fact wrong. Make sure you do your own research or talk to a financial adviser before making any investment decisions.
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