Having your mortgage application declined because of debt is more common than you might think — and it often catches people off guard.
Many borrowers are surprised when debt becomes the reason for a decline, especially when repayments have felt manageable day to day.
That’s because lenders aren’t just looking at whether your repayments feel manageable right now. They’re assessing whether your income can carry both your mortgage and your existing commitments if interest rates go up.
Understanding how lenders view debt is the first step to understanding what went wrong — and how it may have affected your chances of approval.
In New Zealand, existing debt directly affects how much you can borrow — but the total balance is only part of the picture.
Lenders look at:
In many cases, the bigger issue isn’t the debt itself — it’s the ongoing commitments or credit limits attached to it.
This is one of the more common situations where a borrower’s personal view of affordability differs from how the lender assesses overall risk.
Banks need to be satisfied that your income can comfortably cover both your existing commitments and a new mortgage. That includes:
In simple terms, lenders want to see that once all your financial commitments are accounted for, there’s still enough room to support a home loan.
They also stress-test your repayments at higher interest rates — so even if you’re comfortable at current rates, you might still fall short of the bank’s affordability calculations. In some cases, lenders also look at how your total debt compares to your income as a broader measure of risk.
This is one of the most common reasons an application looks fine on the surface but doesn’t pass a lender’s assessment.
Not all debt is treated the same way, but all of it plays a role in how your application is assessed.
Credit cards are one of the most commonly overlooked factors. Lenders typically assess the full credit limit — not just the balance. So a card with a $20,000 limit can be treated as a $20,000 liability, even if you owe little or nothing at all. That can significantly reduce how much you’re able to borrow.
Personal and car loans tend to have a more direct impact. Because they come with fixed monthly repayments, they eat into your available income — making it harder for your application to meet the bank’s servicing criteria.
Buy Now Pay Later (BNPL) facilities are not always treated in the same way by every bank. Some lenders may look at the underlying spending rather than simply adding the full BNPL balance into affordability. For example, BNPL used for essential living costs may be treated differently from BNPL used for one-off discretionary purchases. If the BNPL will be fully repaid and stopped before drawdown, some lenders may take a more flexible view. Because policies vary, it is best to get advice before assuming BNPL will or will not affect your borrowing capacity
A mortgage decline is rarely down to one debt in isolation. More often, it’s the combined weight of your commitments leaving too little room within the lender’s assessment.
Even small debts can add up. Together, they can push your application outside the bank’s affordability or risk thresholds — which is why so many borrowers are caught off guard. The problem isn’t any single loan; it’s how everything stacks up together.
This is where borrowers easily slip up because smaller commitments are often overlooked, even though they still affect how the application is assessed.
Yes — in many cases, you can.
Approval comes down to whether your income can still support the loan after your existing commitments are factored in. Small or short-term debts may have little impact, while larger or ongoing ones can limit what’s possible.
In some situations, how your application is structured — and which lender you approach — can make a real difference. The key difference is not just whether you have debt — it’s how that debt is viewed within the overall structure of your application
If debt was a factor in your decline, the focus is usually on improving how your application looks next time around. This may involve reviewing existing commitments, reducing unnecessary credit exposure, or allowing time for the overall application position to improve before applying again.
For example, lenders may assess large unused credit card limits as ongoing financial exposure, even when little or no balance is owing.
What matters most is approaching your next application differently, rather than simply resubmitting with the same structure.
If you’re unsure where to start read our artile what to do if your home loan is declined in New Zealand.
Debt tends to create more serious issues when it combines with other factors, such as:
When several of these are present at once, lenders may view the overall risk as too high — even if nothing stands out as a major problem on its own.
One of the most frequent mistakes is keeping high credit card limits open because the balance is low. This is often as a financial safety net for borrowers. In mortgage assessments, unused limits can still count against you. A dormant card you never touch can still reduce your borrowing power.
Another common mistake is taking on new debt just before applying. This may be a car loan, a new credit card, or increased BNPL use.
It’s also worth knowing that lenders review bank statements and spending patterns. In some cases they may reassess your position just before settlement. A large purchase at the wrong moment can create problems you weren’t expecting.
Many borrowers assume that if they can comfortably manage their repayments, the bank will see it the same way. However, lending assessments are based on structured calculations, not personal comfort.
If debt played a role in your mortgage decline, understanding how lenders assessed your overall financial position is often the most important step before applying again.
In many situations, the issue is not just the debt itself. The issue is how the overall application appears once income, commitments, and financial exposure are assessed together.
If you want to better understand some of the alternative pathways borrowers sometimes explore after a decline, you can read more about alternatives after a mortgage decline.
You may also find it helpful to understand why your mortgage was declined and how lenders typically assess deposit-related applications.
And if you’re still deciding whether professional guidance could help, you can also read more about whether a broker can help after a mortgage decline.
Angela is an accredited Financial Adviser, licensed under FSP742251 and has been in the Financial Industry since 2006. Our 5-star Google reviews reflect the excellent customer experience we promise — making your home loan journey positive, stress-free, and rewarding. At Platinum Mortgages, our clients are the reason we exist — so you can be confident every step is guided by genuine care and expertise.
