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We've just bought our first home and don't really understand the rules about extra mortgage payments. If we have a bit left over each month, what's a sensible way to use it?
Congratulations on buying your first home! It's a big milestone, and it's completely normal to find the mortgage rules confusing at first.
If you have a bit of money left over each month, putting some of it towards your mortgage can be a great way to save interest and become mortgage-free sooner. But in New Zealand, the best approach depends on whether your mortgage is fixed or floating, what your bank allows, and whether you've built up enough savings for unexpected expenses.
The key is to balance three things: keeping some cash available, avoiding unnecessary mortgage interest, and making extra repayments without accidentally triggering bank fees.
1. First, understand what type of mortgage you have
In New Zealand, there are two common mortgage types, and the rules for extra payments can differ.
Fixed-rate mortgage
Your interest rate is locked in for a set period. Banks often limit how much extra you can repay during that period without an early repayment charge. Some allow small additional regular payments or a limited lump sum each year.
Floating-rate mortgage
Your interest rate can change. You can generally make additional repayments more freely, although the exact terms depend on your loan. The trade-off is that floating rates are often higher than fixed rates.
Some homeowners split their mortgage between fixed and floating portions to get a mix of rate certainty and repayment flexibility.
Important: Don't assume that you can pay any extra amount into a fixed loan without a fee. Check your specific loan agreement first.
2. A sensible order for using your spare money
For most first-home owners, I'd suggest working through these steps in order.
Step 1: Build an emergency fund
Start with a small buffer, perhaps $1,000, then gradually work towards a few months of essential expenses. Owning a home brings unexpected costs, from plumbing repairs to replacing appliances. Keep this money accessible in a separate savings account. Start your emergency fund – preparing for life’s unexpected turns » SortedHow to get out of debt quickly » Sorted
Step 2: Clear expensive debt
If you have credit-card balances, buy-now-pay-later debt or personal loans with high interest rates, these will often be a better priority than extra mortgage payments. Keep making your required mortgage payments, of course.
Step 3: Make extra mortgage payments where allowed
Once your emergency fund is underway and expensive debts are under control, extra mortgage payments can be an excellent use of spare cash. They reduce the balance on which interest is charged and can shorten the loan term.
Step 4: Keep some flexibility
Don't commit every spare dollar to the house. You may need money for maintenance, insurance excesses, rates, or simply enjoying your new home. You can also consider longer-term savings and KiwiSaver goals.
3. How much difference can extra payments make?
Even modest extra repayments can add up because they reduce your outstanding loan balance, which means less interest is charged over time.
For illustration, the Reserve Bank of New Zealand gives an example of a $200,000 mortgage over 25 years at 6% interest. Paying an extra $50 per month could save around $17,500 in interest and clear the mortgage roughly two years earlier. Your own result will depend on your rate, loan balance and repayment terms. I want to learn about saving - Reserve Bank of New Zealand
4. What if you're on a fixed rate and can't pay extra yet?
You still have options.
- Check your annual extra-payment allowance. Some lenders allow a certain amount of additional repayments without a fee. The limit varies by bank and loan product.
- Save the surplus in the meantime. Put the money in an accessible savings account or suitable term deposit, then reassess when your fixed rate expires. Compare the after-tax interest you earn with the mortgage interest you could avoid. I want to learn about saving - Reserve Bank of New ZealandEarly repayment charges
- Ask about offset or revolving-credit mortgages. These can let you use spare cash to reduce the interest charged while retaining access to funds, but they have different rates, conditions and spending risks. They aren't automatically the best option for everyone.
For example, BNZ's Standard fixed-rate home loan allows extra repayments of up to 5% of the loan balance each year without an early repayment charge, subject to its terms. Other lenders and products have different rules, so don't assume that allowance applies to your loan. Paying off your home loan fasterHome loan types
5. Let's work out what's sensible for your mortgage
I can help you compare whether to make extra payments now, build savings first, or wait until your fixed term ends.
We'll start with what you have available rather than assuming you need to throw every spare dollar at the mortgage. The goal is to get ahead financially while keeping enough breathing room to enjoy your first home.
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Captured 11 October 2026