An affordability-related mortgage decline means the application did not meet the lender’s servicing calculation. It does not necessarily mean the repayments feel unaffordable in the borrower’s current day-to-day budget.
Lenders apply their own assessment rates, expense assumptions and servicing policies to test whether the proposed mortgage remains affordable under stricter conditions.
This page focuses specifically on the lender’s affordability assessment. For a broader diagnosis covering credit history, deposit, property, income evidence and policy, read Why Was My Mortgage Declined in New Zealand?
Banks generally calculate the income remaining after allowing for:
New Zealand lenders also have responsible lending obligations when assessing affordability, including making reasonable inquiries into income, expenses and the likelihood that repayments can be made without substantial hardship.
The lender is not simply asking whether today’s repayments appear manageable. It is testing whether the proposed loan fits its servicing model and retains an acceptable buffer.
Bank lending may also be affected by Reserve Bank of New Zealand debt-to-income (DTI) restrictions, which limit the proportion of new bank lending that can be made at high DTI ratios. These restrictions are separate from a lender’s affordability or servicing assessment, so a DTI restriction and a servicing shortfall are not the same test.
Borrowers commonly compare current income and expenditure with repayments at the advertised interest rate.
A lender may assess the position differently:
| What the lender may consider | What this can mean in the affordability assessment |
|---|---|
| A higher assessment rate | The proposed mortgage may be tested at a higher rate than the borrower currently expects to pay. |
| Living-expense benchmarks | Declared expenditure may be compared with the lender’s assumptions or reasonable living-cost benchmarks. |
| Credit limits and other commitments | Available credit facilities can affect the servicing calculation, not only the balance currently owing. |
| Conservative treatment of some income | The treatment of income can depend on its type, consistency and the evidence available. |
| Future homeownership costs | Rates, insurance and other relevant property expenses may be allowed for. |
| A servicing surplus or buffer | The lender may require sufficient headroom to remain after assessed commitments. |
This can produce a lower borrowing figure than the borrower expected.
For example, a $10,000 credit-card limit may affect borrowing capacity even if the balance owing is $0, because some lender assessments take the available credit limit into account rather than looking only at the amount currently owing. How the commitment is calculated varies between lenders.
Angela Downie, Financial Adviser at Platinum Mortgages, explains:
“When a borrower tells me, ‘I know I can afford the repayments,’ I usually discover they’re calculating affordability very differently from the lender.
That difference is often what causes the confusion. One of the most valuable things I do is bridge that gap by explaining what is driving the lender’s calculation and what, if anything, can realistically be changed to improve the client’s position.”
Stress testing assesses whether the proposed mortgage would remain manageable at a higher assessment rate than the borrower may currently expect to pay.
In its March 2026 Credit Conditions Survey, the Reserve Bank of New Zealand reported that test rates used for residential mortgage affordability assessments were generally between 6.5% and 7.0%. These rates can change as interest rates and lender policies change.
For example, a mortgage may appear affordable at the current interest rate but fail once the lender recalculates the repayments at its assessment rate.
The assessment rate and servicing approach also vary between lenders. A decline from one lender therefore does not establish that every lender will produce the same calculation.
Existing debts and credit facilities may reduce the surplus available under the lender’s assessment, but they are only one component of the full affordability model.
If personal loans, car finance, credit cards or Buy Now Pay Later facilities are the main concern, read Can I Still Get a Mortgage If I Have Debt?
For a detailed explanation of how credit-card balances and limits may affect borrowing capacity, read How Credit Card Debt Affects Mortgage Borrowing Capacity in NZ.
Where transaction or bank statements form part of the assessment, they may also show ongoing expenditure that is higher than the amount a borrower initially allowed for in their own budget.
Common reasons an affordability assessment may fail include:
An affordability decline is often caused by the combined calculation rather than one isolated expense.
Yes, in some cases. An affordability decline from one lender does not necessarily mean every lender will reach the same outcome. However, it also does not mean another lender will approve the application.
The first step is to identify which part of the servicing calculation caused the shortfall.
Depending on the evidence, possible changes may include:
The same application should not simply be sent to several lenders without understanding the original shortfall.
If the decline involved broader issues or you’re unsure what to do next, use our Bank Said No page.
Affordability models are not identical. Lenders may use different assessment rates, expense assumptions, income treatments and required buffers.
This means a borrower may fall short with one lender but fit another lender’s calculation. It does not guarantee approval elsewhere; the complete application must still be suitable and sustainable.
A specialist lender may apply a different servicing policy from a main bank. This may provide another pathway where the application remains affordable but does not fit standard bank policy.
Our Non Bank Lending page explains how specialist lending works and when it may be appropriate.
Angela adds:
“When an application is declined due to affordability, I don’t automatically assume the client needs to wait another year. My first step is to understand exactly where the servicing shortfall is and whether another suitable lender assesses the application differently.
I work backwards by comparing borrowing capacity across suitable lenders and identifying what is actually preventing approval. Sometimes the answer is a relatively small adjustment, such as reducing the loan amount or providing stronger income evidence.
If those changes are enough, we’ll move forward. If not, I’ll recommend waiting until the application is genuinely stronger. My advice is always based on achieving the best long-term outcome, not simply submitting another application as quickly as possible.”
Platinum Mortgages can review the income, living expenses, current commitments, deposit or equity, property and requested loan.
We can help identify the part of the servicing calculation creating the shortfall and assess whether reducing the loan, addressing a material financial commitment, waiting or considering another suitable lender appears more realistic.
It generally means the lender’s assessment did not leave enough surplus after allowing for assessed living expenses, existing commitments and the proposed mortgage repayments at its assessment rate. The result reflects that lender’s servicing calculation rather than simply whether today’s repayments fit within your own household budget.
No. Lenders can use different assessment rates, expense assumptions, income treatments, credit-commitment calculations and required servicing buffers. This means the same borrowing position may produce a different servicing result with different lenders.
No. Existing debt may be only one part of the lender’s calculation. Income treatment, living expenses, the assessment rate, requested loan amount and required servicing buffer may also be contributing to the shortfall.
Not before the original reason has been identified. Multiple applications can create unnecessary enquiries without addressing the underlying shortfall.
Platinum Mortgages can review the lender’s affordability concerns and the complete borrowing position before another formal application is submitted.
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Platinum Mortgages New Zealand Limited (FSP752271) is a licensed Financial Advice Provider. Angela Downie (FSP742251) is a registered Financial Adviser who provides financial advice on behalf of Platinum Mortgages New Zealand Limited. Angela has worked in the financial industry since 2006.
Angela’s experience includes working with borrowers where assessment rates, income treatment, living expenses or existing commitments have contributed to a servicing shortfall.
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