When it comes to buying property in New Zealand, your borrowing power — the maximum amount a lender is willing to lend you — determines which properties you can realistically purchase. Many buyers assume their borrowing capacity is fixed, but in reality there are a number of practical steps you can take to meaningfully increase it. Here are eight proven strategies used by New Zealand mortgage advisers to help buyers maximise their borrowing potential.
How Lenders Calculate Borrowing Power in New Zealand
Before exploring strategies, it helps to understand what lenders actually assess. In New Zealand, borrowing power is primarily determined by:
- Gross income: All verified income sources — salary, wages, rental, business income, Working for Families, overtime
- Committed expenses: Existing debt repayments, ongoing financial commitments
- Living expenses: Both declared expenses and those evidenced in bank statements
- Debt-to-Income (DTI) ratio: Most lenders limit total debt to six times gross annual income for owner-occupiers
- Test interest rate: Lenders stress-test your application at a rate higher than the actual lending rate (typically 8–9.5%) to ensure you can afford repayments if rates rise
Strategy 1: Reduce or Eliminate Consumer Debt
This is the single most impactful thing most borrowers can do. Every dollar of existing debt reduces your borrowing capacity disproportionately because lenders include the minimum repayments in your committed expenses. Credit card limits have a particularly outsized effect — a $10,000 credit card limit reduces borrowing power by approximately $50,000–$60,000, regardless of whether the balance is zero.
Actions to take:
- Pay off credit card balances and reduce or cancel cards you don’t need
- Close Buy Now Pay Later accounts (Afterpay, Laybuy, Humm)
- Pay down personal loans, especially high-interest consumer debt
- Consider whether a car loan can be paid off before applying
Strategy 2: Increase Your Documented Income
Lenders can only include income they can verify. If you have income sources that are not well-documented, work on creating a paper trail:
- Ensure all income is paid through your bank account (not cash)
- If you have a side business, ensure your tax returns are filed and up to date
- If you receive overtime or bonus payments regularly, obtain a letter from your employer confirming it is ongoing
- If you receive Working for Families tax credits, include them in your application
Strategy 3: Apply With a Co-Borrower
Adding a co-borrower — a partner, spouse, or eligible family member — to your mortgage application can significantly increase your borrowing capacity. Lenders assess the combined income of all borrowers on the application, which may push you beyond the borrowing limit you would have reached alone.
This is particularly relevant for single-income buyers in Auckland, where solo borrowing capacity may fall short of the deposit-plus-mortgage required to purchase in their preferred area.
Strategy 4: Increase Your Deposit
A larger deposit reduces the loan amount required and improves your Loan-to-Value Ratio (LVR). Crossing from a 10% to a 20% deposit removes the need for low-deposit margin pricing (which some lenders apply) and opens up more competitive rate options. Strategies to grow your deposit include:
- Withdraw eligible KiwiSaver contributions via the First Home Withdrawal scheme
- Apply for the Kāinga Ora First Home Grant (up to $10,000 for existing homes, $20,000 for new builds, subject to eligibility)
- Accept a family gift or parental contribution (lenders require a signed gift letter confirming repayment is not expected)
Strategy 5: Demonstrate Stable, Long-Term Employment
Lenders strongly prefer borrowers with stable employment history. If you are in your probationary period, recently changed industries, or have had frequent job changes, this can reduce lender confidence. Strategies to strengthen your employment profile:
- Where possible, delay your application until you have completed your probationary period (typically three to six months)
- Obtain a letter from your employer confirming permanent employment and income
- If self-employed, ensure you have at least two years of financial accounts showing consistent or growing income
Strategy 6: Reduce Your Living Expenses (Evidenced by Bank Statements)
In the months leading up to your application, lenders will scrutinise your bank statements. High discretionary spending on dining, entertainment, gambling, or overseas transfers raises red flags. In the three to six months before applying:
- Cook at home more often and reduce dining-out expenditure
- Cancel or pause non-essential subscriptions
- Avoid large one-off purchases on credit or BNPL
- Transfer regular savings into a dedicated savings account to demonstrate financial discipline
Strategy 7: Choose the Right Lender for Your Profile
Not all lenders calculate borrowing power the same way. Some banks are more conservative; others are more flexible with certain income types. For example, some lenders include 100% of rental income in serviceability calculations while others include only 75–80%. If you have complex income or a non-standard employment situation, the right lender makes a significant difference. NZ mortgage consultants can match your profile to the lender most likely to offer the highest borrowing capacity on favourable terms.
Strategy 8: Fix Your Credit History
Negative marks on your credit file — defaults, missed payments, credit enquiries — reduce both your credit score and lender confidence. Steps to improve your credit health before applying:
- Obtain your credit report and dispute any errors
- Pay all outstanding defaults and get written confirmation of clearance
- Ensure all current accounts (utilities, phone, subscriptions) are paid on time
- Avoid multiple credit applications in the months before your mortgage application
How Much Could These Strategies Add?
| Strategy | Potential Borrowing Power Increase |
|---|---|
| Cancel $10,000 credit card limit | ~$50,000–$60,000 |
| Add a co-borrower earning $60,000/year | ~$200,000–$300,000 |
| Pay off $15,000 personal loan | ~$60,000–$80,000 |
| Increase deposit from 10% to 20% | Removes low-deposit margin; opens better products |
| Document irregular income sources | Varies widely by amount |
FAQ: Borrowing Power in New Zealand
How long before applying should I start improving my finances?
Ideally, begin three to six months before applying. This gives time for bank statements to reflect improved spending habits, credit cards to be cancelled, and debts to be reduced or eliminated.
Does my KiwiSaver balance affect borrowing power?
KiwiSaver is counted as an asset and can demonstrate savings discipline, which lenders view positively. The First Home Withdrawal can reduce the loan amount needed, improving your application.
Can I borrow more by extending my loan term?
Choosing a 30-year term instead of 25 years reduces the minimum monthly repayment, which can increase your assessed borrowing capacity. However, it significantly increases total interest paid over the life of the loan.
Key Takeaway: Your borrowing power is not fixed — it can be meaningfully increased through deliberate financial actions taken in the months before your mortgage application. Focus first on eliminating unnecessary liabilities, then on documenting and growing your income, and ensure your bank statements reflect responsible financial behaviour.