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How Much Can I Borrow Based on My Income? A First-Home Buyer’s Guide for New Zealand
by Global Finance
If you’re a first-home buyer, one of the first questions you’ll probably ask is:
How Much Can I Borrow Based on My Income?
Whether you’re just starting to save a deposit or already attending open homes in Auckland, Tauranga, Hamilton, Christchurch, Wellington or elsewhere in New Zealand, understanding your borrowing capacity is one of the most important steps before getting serious about buying.
The reality is there isn’t a magic number. Two people earning exactly the same income can end up with very different borrowing limits depending on their debts, family size, age, spending habits, deposit, and even which bank they apply to.
The good news is that income isn’t the only thing lenders look at. In some situations, income from a second job, boarder, overtime, commission, or rental property may also help strengthen your application and increase your borrowing power.
As a very rough guide, many first-home buyers may be able to borrow somewhere between 4 and 7 times their household income, although this varies significantly between lenders and individual circumstances.
What Affects How Much You Can Borrow for a Mortgage?
Banks look at far more than just your salary. They assess your income, expenses, debts, deposit, employment stability, and overall financial position before deciding how much they’re comfortable lending.
When reviewing a mortgage application, lenders typically look at:
- Total household income
- Employment stability
- Existing loans and debts
- Credit card limits
- Living expenses
- Discretionary expenses
- Number of dependants
- Age of the applicants
- Deposit available
- Credit history
- Property details
- Current lending policies
Lenders aren’t simply assessing whether you can afford repayments today.
They’re asking:
“Will this borrower still be able to manage the mortgage in future if interest rates rise or household expenses increase?”
Estimated Borrowing Capacity by Household Income
The figures below provide a general indication only.
| Gross Household Income | Indicative Borrowing Capacity* |
| $80,000 | $350,000 – $500,000 |
| $100,000 | $450,000 – $650,000 |
| $150,000 | $700,000 – $950,000 |
| $200,000 | $950,000 – $1,250,000 |
| $250,000+ | $1,200,000+ |
*Illustrative only. Actual borrowing capacity depends on your expenses, debts, deposit size, lender policy, interest rates, and individual circumstances.
Why Two Buyers on the Same Income Can Borrow Different Amounts
This is something that catches quite a few first-home buyers off guard.
Let’s say two households both earn $150,000 per year.
Household A
- No personal loans
- Minimal credit card limits
- Strong savings habits
- No dependants
Household B
- Car finance
- Multiple credit cards
- Childcare costs
- Higher monthly spending
Even though both households earn the same income, Household A may be able to borrow substantially more because they have fewer ongoing commitments.
Income matters, but what you spend and owe matters too.
How Do Banks Work Out How Much You Can Borrow?
Most lenders use servicing calculators to test whether you can comfortably afford a mortgage.
While each lender has its own criteria, the process generally looks something like this:
- Verify your income.
- Review employment history.
- Calculate living & discretionary expenses.
- Assess existing debt commitments.
- Apply a mortgage test rate.
- Review your deposit.
- Check your credit history.
- Calculate a maximum lending amount.
This is why it’s common for one bank to approve a higher loan amount than another.
There is no one-size-fits-all lending calculator.
Existing Debt Can Reduce Your Borrowing Capacity
This is where a lot of buyers get caught out.
You might be earning a decent income, but existing debt can quickly reduce the amount a lender is willing to approve.
Common examples include:
- Car loans
- Personal loans
- Credit cards
- Buy Now Pay Later accounts
- Overdrafts
- Student loans
One of the biggest surprises for first-home buyers is that even an unused credit card can affect borrowing power.
You may owe nothing on the card, but the bank still treats the available limit as potential future debt.
Reducing unnecessary debt and lowering unused credit card limits can often improve your position.
What Income Do Banks Accept for a Home Loan?
Many people assume banks only look at their salary. In reality, lenders may consider several different income sources when assessing affordability.
| Income Type | Commonly Considered? | What Lenders Typically Look For |
| Salary & Wages | ✅ Yes | Permanent employment, regular income, recent payslips |
| Overtime | ✅ Often | Consistent history and evidence it is ongoing |
| Bonuses | ✅ Often | Proven track record and likelihood of continuing |
| Commission | ✅ Often | Stable earnings history |
| Self-Employed Income | ✅ Yes | Financial statements, tax returns, and business performance |
| Potential Rental Income | ✅ Often | Existing tenancy or rental assessment from a home and income proeprty |
| Second Job Income | ⚠️May Be Accepted | Stable secondary employment and sufficient history |
| Boarder Income | ⚠️May Be Accepted | Suitable owner-occupied property and lender policy |
| Contracting Income | ⚠️Often | Consistent work history and income continuity |
| Government Benefits | ⚠️ Depends | Benefit type and lender criteria |
| Overseas Income | ⚠️ Depends | Currency, country, and lender requirements |
Tip: Not all lenders assess income the same way. A bank that’s prepared to use all of your overtime or second-job income may offer a very different result to one that doesn’t. Because every lender uses different servicing calculators and lending policies, two banks can provide very different borrowing outcomes. A mortgage adviser can often compare multiple lenders to identify which may be the best fit for your circumstances
Can I Use Income From a Second Job to Get a Bigger Mortgage?
Yes. Many lenders will consider income from a second job if it is stable, ongoing, and likely to continue.
A lot of first-home buyers assume their weekend job or side role won’t count.
Fortunately, that’s not always the case.
If you’ve been consistently earning income from:
- Part-time work
- Weekend shifts
- Casual employment
- Contracting work
- A second professional role
- Business Income (Uber, Cleaning Business)
some lenders may include part or all of that income in your application.
Example
Without a second job:
- Main income: $90,000
With a second job:
- Main income: $90,000
- Additional income: $15,000
That additional income could give your borrowing power a meaningful lift and help get you over the line for the property you want.
Can Boarder Income Be Used for a Mortgage in New Zealand?
Yes. Some lenders may include boarder income when assessing a mortgage application, although the amount recognised varies between lenders.
Many first-home buyers buy a three or four-bedroom home with plans to rent out a spare room.
Where lender policy allows, some of that expected boarder income may be used to support the application.
This can provide a bit more breathing room when banks calculate affordability.
Different lenders have different rules. Some may:
- Use a standard boarder income allowance
- Cap the amount recognised
- Require a minimum number of bedrooms
- Apply additional conditions
If you’re planning on having a boarder, it’s worth checking how each lender treats the income before submitting an application.
Worked Example: How Additional Income Can Increase Borrowing Capacity
Let’s look at a simplified first-home buyer scenario.
Scenario 1: Salary Only
| Description | Amount |
| Annual Salary | $90,000 |
| Existing Debt | Nil |
| Deposit | $80,000 |
| Indicative Borrowing Capacity* | $550,000 |
Scenario 2: Salary + Second Job
| Description | Amount |
| Annual Salary | $90,000 |
| Second Job Income | $15,000 |
| Total Assessable Income | $105,000 |
| Indicative Borrowing Capacity* | $620,000 |
Potential increase: approximately $70,000
Scenario 3: Salary + Boarder Income
| Description | Amount |
| Annual Salary | $90,000 |
| Assessable Boarder Income | Accepted by lender |
| Indicative Borrowing Capacity* | $600,000-$640,000 |
Potential increase: approximately $50,000-$90,000
Scenario 4: Salary + Second Job + Boarder Income
| Description | Amount |
| Annual Salary | $90,000 |
| Second Job Income | $15,000 |
| Boarder Income | Accepted by lender |
| Indicative Borrowing Capacity* | $650,000-$720,000 |
Potential increase: up to $170,000+ compared with relying on salary alone.
*Examples are illustrative only and do not represent lending guarantees.
A Real-World Example
Let’s say Sarah earns $95,000 a year and has built a deposit using a combination of KiwiSaver and personal savings.
Based on her salary alone, she might be able to borrow around $580,000.
However, Sarah also works regular weekend shifts earning another $12,000 per year and intends to rent out a spare room once she buys a home.
If a lender is willing to recognise both income sources, her borrowing capacity could increase enough to give her access to properties that were previously out of reach.
That’s why it’s always worth having your situation assessed properly rather than assuming what will and won’t count.
Does KiwiSaver Increase Borrowing Capacity?
Not directly. KiwiSaver usually helps strengthen your deposit rather than increasing the amount a bank will lend.
A larger deposit can help by:
- Reducing the amount you need to borrow
- Improving your loan-to-value ratio (LVR)
- Increasing lender options
- Strengthening your application
For many first-home buyers, KiwiSaver is what helps turn home ownership from “one day” into “right now”.
How Can You Increase Your Borrowing Capacity?
If you’re trying to maximise your borrowing power, a few practical changes can sometimes make a bigger difference than you’d expect.
Consider:
- Reducing personal debt
- Paying off car finance
- Lowering unused credit card limits
- Increasing your deposit
- Building a strong savings history
- Maintaining good account conduct
- Including eligible second-job income
- Including eligible boarder income
- Avoiding missed repayments
Sometimes a small tweak is all that’s needed to improve the result.
Why Mortgage Pre-Approval Is Worth Getting Early
Before you start trawling Trade Me every night or falling in love with a house that’s outside your budget, it’s worth understanding where you stand.
Mortgage pre-approval can help you:
- Understand your budget
- Identify issues early
- Understand lender requirements
- Shop with confidence
- Move quickly when the right property comes along
Most buyers find the process much less stressful once they know what they’re working with.
Frequently Asked Questions
What salary do I need to buy a house in New Zealand?
There is no minimum salary requirement. The amount you can borrow depends on your total financial position, including income, expenses, deposit size, existing commitments, and lender affordability requirements.
Can a second job help me get approved for a mortgage?
Yes. Many lenders will consider second-job income if it is regular, ongoing, and supported by sufficient employment history.
Can boarder income be used for a mortgage application?
Potentially. Some lenders may include boarder income when assessing affordability for an owner-occupied home, which may increase borrowing capacity.
What reduces borrowing capacity?
Common factors include:
- Personal loans
- Car finance
- Credit card limits
- High living expenses
- Existing commitments
- Dependants
- Poor account conduct
Should I get mortgage pre-approval before looking for a home?
Yes. In most cases, getting pre-approval before house hunting helps you understand your budget and avoid looking at properties that may not be affordable. Having a pre-approval in place may allow you to bid at auction or make an offer on a property being sold by negotiation, knowing how much you may be able to borrow before you start looking.
Can I use income from Uber driving, a cleaning business, or a side business to get a mortgage ?
Potentially. Many lenders may consider income from Uber driving, cleaning businesses, self-employment, contracting, rental property income, boarders, or part-time work alongside your main employment. Our mortgage brokers can help assess which income sources may be acceptable and how they could contribute towards your home loan application.
The Bottom Line
There isn’t a one-size-fits-all answer when it comes to borrowing capacity.
While your income is important, banks are looking at the full picture. Your deposit, existing debts, spending habits, credit history, and overall financial position all play a part.
The good news is there are often practical ways to improve your position. We’ve seen buyers increase their borrowing power by reducing credit card limits, clearing small debts, using KiwiSaver towards their deposit, or making use of additional income sources that some lenders are prepared to recognise.
Before you start getting attached to a property or planning your next move, it’s worth finding out exactly where you stand. A personalised lending assessment will give you a much clearer idea of your budget and help you get on the property ladder with confidence.
NZ Lending Disclaimer
This article is intended for general information purposes only and does not constitute personalised financial advice, a lending approval, or a guarantee of borrowing capacity. Lending criteria, interest rates, LVR requirements, DTI restrictions, and lender policies can change over time. Any borrowing figures used are illustrative examples only. The amount you may be able to borrow will depend on your individual circumstances and the lender’s assessment at the time of application. You should obtain personalised advice before making any financial or property purchasing decisions.
