How Much Can I Afford To Borrow?

How much can I actually afford to borrow?

Your borrowing capacity is the maximum loan amount a lender will approve - but that number is rarely the same as what you can comfortably repay. Work out the difference before you apply, not after.

The general rule for borrowing affordability in NZ

Most lenders in New Zealand use debt-to-income (DTI) ratios as a starting point. The widely referenced benchmark is the 28/36 rule: spend no more than 28% of your gross monthly income on housing costs, and keep total debt repayments below 36% of gross income.

In practice, New Zealand banks have applied DTI caps more formally since the Reserve Bank introduced DTI restrictions. Under current settings, most banks will not lend more than six times your gross annual income for a home loan. Non-bank lenders and personal loan providers use their own thresholds, but the underlying logic is the same: your repayments need to fit within your income without putting you under financial stress.

These ratios are a starting point, not a ceiling. Just because a lender will approve you at 36% DTI does not mean repaying at that level will feel comfortable month to month.

Factors affecting borrowing capacity

Several things shift how much a lender will offer you, and how much you should actually take on.

Income

Lenders assess your gross income - wages, salary, self-employment earnings, and sometimes rental income or Working for Families payments. Irregular or contract income can reduce the figure lenders are willing to use, even if your actual earnings are strong.

Existing debt

Credit cards, car loans, buy-now-pay-later balances, student loans - all of these reduce your available borrowing room. Lenders count the minimum repayment on each debt, not just the balance. A $5,000 credit card limit can reduce your home loan capacity by tens of thousands of dollars, even if you never use it.

Credit history

Your credit score tells lenders how you've managed debt in the past. A strong credit history opens access to lower interest rates and higher loan amounts. A complicated credit history - missed payments, defaults, or previous declines - doesn't automatically disqualify you, but it does affect which lenders will consider your application and on what terms.

Interest rates

Higher interest rates reduce borrowing capacity directly. At a 7% interest rate, the same monthly repayment buys you a smaller loan than it would at 5%. When rates are rising, it pays to stress-test your budget at a rate 2-3 percentage points above your likely rate.

Deposit or down payment

A larger deposit reduces the loan-to-value ratio (LVR) on a home loan. Most NZ banks require at least a 20% deposit to avoid low-equity lending restrictions, though some products allow lower deposits with additional conditions. For personal loans, there is no deposit - but a larger savings buffer signals financial stability to lenders.

Assessing your personal financial situation

The question "how much can I afford to borrow" is best answered by working through your own numbers, not just relying on a pre-approval figure.

Step 1: Calculate your net monthly income

Start with what actually lands in your bank account each month after tax and KiwiSaver contributions. Use your average over the last three months if your income varies.

Step 2: List all monthly expenses

Go through your bank statements line by line. Include rent, groceries, utilities, subscriptions, insurance, petrol, dining out, and any irregular expenses averaged across the year. Most people underestimate this figure by 15-20% when they do it from memory.

Step 3: Subtract existing debt repayments

Add up the minimum repayments on every current debt. Subtract this from your net income. What remains is your disposable income.

Step 4: Apply the repayment comfort test

A common guideline is to keep total debt repayments - including the new loan - below 30-35% of your net income. This is more conservative than the gross-income DTI ratios lenders use, but it reflects what actually works in a real household budget.

Step 5: Use a home loan calculator

Home loan calculators let you model different loan amounts, interest rates, and repayment terms to see what a monthly repayment looks like. Enter the repayment figure you calculated as affordable in step 4, then work backwards to find the loan amount it supports. This is more useful than entering a loan amount and hoping the repayment fits.

Home loan calculators: what they tell you and what they don't

Online home loan calculators are a practical first step. They give you a repayment estimate based on loan amount, interest rate, and term. What they do not account for is your full financial picture - existing debts, living costs, or changes in income.

Use a calculator to set a repayment ceiling, then check whether that ceiling is genuinely comfortable given everything else in your budget. If the calculator says your repayment is $2,200 per month and your disposable income after all expenses is $2,100, the numbers do not work - regardless of what a lender might pre-approve.

Financial guidance: when to get professional advice

Self-assessment is a good starting point, but it has limits. A mortgage adviser or loan broker can run lender-specific affordability assessments, identify which products you qualify for, and flag issues in your application before they cause a decline.

Nomu Finance matches applicants with suitable lenders from a panel that includes Nectar, Finance Now, and MTF - lenders who each apply their own assessment criteria. Rather than submitting multiple applications and collecting multiple declines, one conversation with Nomu Finance identifies which lenders are realistic options for your specific circumstances. This matters especially if you have a complicated credit history or have been declined elsewhere.

Under New Zealand's responsible lending requirements, lenders are obligated to assess whether a loan is genuinely affordable for you - not just whether you qualify on paper. Nomu Finance's process is built around that same standard.

Red flags: when to borrow less than you're offered

Being pre-approved for a certain amount does not mean borrowing that amount is wise. Consider borrowing less if:

• Your repayments would exceed 30% of your net monthly income
• You have less than three months of living expenses saved as an emergency fund
• Your income is variable or you are on a fixed-term contract
• Interest rates are likely to rise and you haven't stress-tested your budget
• You are relying on both incomes in a couple with no buffer if one changes

Advances in financial technology have made borrowing faster and easier - which increases the risk of taking on more debt than your budget can sustain. The ease of approval is not a signal that borrowing is the right call.

Building your borrowing safety guardrails

Before you commit to a loan, run through these checks:

• Emergency fund: Have at least one to three months of expenses accessible before adding a new repayment commitment.
• Repayment buffer: Your budget should absorb the repayment with room left over - not just break even.
• Rate stress test: Can you still make repayments if your interest rate increases by 2%?
• Goal alignment: Does this loan move you toward your financial goals, or does it delay them?

Ready to find out what you qualify for?

Once you've worked through your numbers and have a clear picture of what you can comfortably repay, the next step is finding lenders who will work with your situation. Talk to Nomu Finance to get matched with lenders suited to your circumstances - whether your credit history is straightforward or not.