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Our income has dropped and we're trying to lower our mortgage payments. If we spread the loan over longer, how do we weigh the breathing room now against the cost later?
When your income drops, extending your mortgage term can be a sensible way to ease financial pressure. The key is to think of it as buying breathing room now in exchange for potentially paying more interest later — and to check whether you can keep the flexibility to pay the loan off faster when your income recovers.
In New Zealand, you generally have a few options: extend the remaining mortgage term, temporarily switch to interest-only payments, or negotiate a short-term repayment reduction with your lender. The right choice depends on how much your payments need to fall, how long your income may be lower, and how much extra interest you can afford over the life of the loan.
1. What extending your mortgage term actually changes
- Your required repayments fall. You spread the remaining principal over more years.
- You repay the principal more slowly. More of your early repayments go towards interest relative to reducing the balance.
- Your total interest usually increases. This is especially true if you keep the loan for the full extended term.
- You gain immediate cash-flow flexibility. That can help you cover essential expenses and avoid falling behind on your mortgage.
The important distinction is that a lower repayment isn't necessarily a saving. It's primarily a way of changing when you pay.
2. A worked example: what could the trade-off look like?
Imagine you have a mortgage balance of $500,000, with 20 years left and an interest rate of 5% that stays unchanged throughout the calculation.
Illustrative figures · principal and interest · monthly repayments
Keep 20 years
$3,300
per month, approximately
Extend to 30 years
$2,684
per month, approximately
Monthly breathing room
~$615
Extra interest over the full term
~$174,000
These are rounded estimates, not a lender quote. They exclude fees and assume the interest rate remains 5% for the entire period. Actual mortgage rates will change when fixed-rate periods expire.
That extra $615 each month could make a real difference to groceries, bills and other essentials. But the additional interest is substantial if you keep the mortgage for the entire 30 years.
The crucial point: you don't necessarily have to keep the mortgage for the extended term. If your income recovers and your loan allows extra repayments without significant fees, you may be able to increase your payments again and reduce the additional interest.
3. Compare your options before committing
| Option | Immediate benefit | Main drawback |
|---|---|---|
| Extend the term | Lower regular repayments | More interest if you repay over the longer term |
| Temporarily go interest-only | Potentially a larger payment reduction | You make no progress on the principal during that period |
| Payment holiday | Immediate short-term relief | Interest may continue accumulating while payments are paused |
| Keep the term and reduce other costs | Avoids extending the debt | May not provide enough relief if the income drop is substantial |
These are options to discuss with your lender; approval and the terms available depend on your circumstances. How to manage your mortgage and pay off your home loan early » SortedTypes of mortgages in New Zealand, and how to choose » SortedPayment problems
4. How I would weigh the decision
I'd work through these four questions in order.
How much breathing room do you actually need? Work out the monthly shortfall after essential expenses. If you need $300 extra per month, extending the term enough to free up $600 may be more than you need.
Is the income drop temporary or ongoing? If you expect your income to recover within a year or two, ask about a temporary arrangement before permanently lengthening the loan.
Can you make extra repayments later? Ask your lender about limits on additional repayments, early repayment charges on fixed-rate loans, and whether you can shorten the effective repayment period once your finances improve.
What will the total cost be under each option? Ask the bank to show you the new repayment amount, total interest, fees and outstanding balance after one, three and five years. Compare the options using the same interest-rate assumptions. Sorted's mortgage calculator can also help you compare repayment terms and total interest. How our calculators and tools work » SortedHow to refinance your mortgage » Sorted
One further point: if your income has fallen enough that you're struggling to meet repayments, contact your lender early. In New Zealand, you may be eligible to make a formal hardship application to request a longer repayment term, a payment holiday, or both. Free, confidential support is also available through MoneyTalks. Credit Contracts and Consumer Finance ActPayment problems
5. Let's work out what makes sense for your mortgage
I can help you compare the cost of keeping your current term against extending it, using your actual numbers rather than the illustrative example above.
Your mortgage comparison
Estimates only. Enter approximate figures if you prefer.
The aim isn't necessarily to minimise interest at all costs. It's to find the lowest-cost arrangement that gives your household enough breathing room to stay financially secure now, while keeping a realistic path to paying off the home later.
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Captured 11 October 2026