The questions and original answers

For a first home in New Zealand with a 10% deposit, I'd look for a mortgage that gives you certainty over your essential repayments, flexibility to pay extra when you can, and protection against interest-rate rises.

You don't necessarily need the mortgage with the lowest advertised interest rate. A slightly more flexible loan structure can be worth more if you want to make extra repayments without paying penalties.

1. The five things I'd prioritise

1. Comfortable minimum repayments

Work out what you can afford using your take-home pay after allowing for rates, insurance, maintenance, utilities and other living costs. Stress-test your budget against a higher mortgage rate, not just the rate offered today.

2. The ability to pay extra

Look for a loan that allows additional repayments, lump sums or increased regular payments without hefty break fees. Check the exact limits and conditions, especially if you fix your interest rate.

3. A sensible fixed-versus-floating structure

A fixed rate can give you predictable repayments. A floating rate usually offers more flexibility to repay extra, but its interest rate can change. Splitting your mortgage can give you some of each.

4. A cash buffer after settlement

Don't put every spare dollar into the deposit if it leaves you without emergency savings. Home repairs, insurance excesses and unexpected expenses can arrive quickly.

5. Low total borrowing costs

Compare interest rates, low-equity margins or premiums, loan fees, cashback offers and any conditions attached to them. With a 10% deposit, your loan-to-value ratio (LVR) will generally be around 90%, so low-equity lending costs deserve particular attention.

2. The mortgage structure I'd investigate first

A split mortgage is a good starting point to discuss with a bank or mortgage adviser. For example, you might fix most of the loan for predictable repayments and keep a smaller portion floating for extra repayments.

Illustrative split-loan structure

80% fixed

Repayment certainty

20% floating

Extra-payment flexibility

Example only, not a prescribed ratio. Floating rates can be higher, and the right split depends on your budget and the lender's terms.

Why this can work for you:

• Your fixed portion gives you a more predictable base repayment while you settle into homeownership.
• Your floating portion can let you put bonuses, savings or spare monthly income towards the principal without fixed-loan break costs.
• Your flexibility can be adjusted over time as your income, expenses and equity change.

Ask whether you can instead make extra repayments on a fixed loan within an annual allowance. Some lenders permit this, subject to specific conditions. You may not need a floating portion at all if the fixed-loan terms already meet your needs. Types of mortgages in New Zealand, and how to choose » SortedHow to manage your mortgage and pay off your home loan early » Sorted

Two other features worth comparing

• Offset mortgage: Savings in linked eligible accounts reduce the balance on which interest is calculated. This can be useful if you keep a cash buffer, but compare the rate and account conditions.
• Revolving credit: Works somewhat like a large overdraft secured against your home. It can reward disciplined budgeting, but is less suitable if you might repeatedly spend the available credit.

Neither is automatically better than a standard table loan. For a first home, simplicity and reliable budgeting are valuable.

3. What a 10% deposit changes

With a 10% deposit, you'll usually be borrowing around 90% of the purchase price. That is a high-LVR loan, so the bank may:

• Apply a low-equity margin or premium, or offer a different rate.
• Have stricter lending criteria or limited low-deposit lending availability.
• Review your pricing as you build equity, depending on its policy and the terms of your loan.

High-LVR lending is permitted in New Zealand, but banks have limits on how much of their new lending can fall into this category. Approval isn't guaranteed just because you have the deposit. Understanding loan-to-value restrictions - Reserve Bank of New ZealandLoan-to-value ratio restrictions - Reserve Bank of New Zealand

Ask the lender these questions:

1. What is the interest rate including any low-equity margin?
2. At what level of equity can the margin be reduced or removed, and is that automatic?
3. What valuation or other evidence will be required to qualify for better pricing?
4. Are there any special conditions or fees for low-deposit borrowers?

Also check whether you qualify for a Kāinga Ora First Home Loan. Eligible buyers may be able to purchase with a deposit as low as 5%, subject to the scheme's criteria and participating lenders. With 10% saved, it is still worth asking whether the scheme is relevant to your circumstances. Financial help for first-home buyers

4. Choose repayments you can comfortably live with

I'd use three repayment numbers when comparing mortgage offers:

• Normal repayment: What you can pay every fortnight without feeling stretched.
• Stress-tested repayment: What you could afford if interest rates rose when you needed to refix.
• Accelerated repayment: What you'd like to pay in a good month, after essentials and savings are covered.

For example, suppose your required mortgage payment is $3,000 a month. You could budget around that amount and voluntarily pay $3,200 when finances allow, rather than committing to $3,200 regardless of what happens.

The important thing is to confirm that your lender allows the extra $200 without a penalty. You can use Sorted's mortgage calculator to compare repayment amounts and the effect of paying your loan down faster. Types of mortgages in New Zealand, and how to choose » SortedHow to manage your mortgage and pay off your home loan early » Sorted

5. Questions to take to a mortgage adviser

Before signing, ask for clear answers to these questions:

• What will our minimum repayments be at today's rate, and at a higher test rate?
• How much extra can we pay on a fixed loan each year without a fee?
• Can we make lump-sum payments or increase regular repayments?
• Would a small floating, offset or revolving-credit portion suit us better?
• What low-equity costs apply at 90% LVR, and when might they disappear?
• Are there cashback offers, and do they require us to keep the loan for a minimum period?
• What happens if we sell the house, refinance, or our income drops?
• Can we choose fortnightly repayments, and how are additional payments applied to the principal?

You can compare banks directly or use a mortgage adviser. Ask an adviser which lenders they work with, whether they charge you a fee and how they're paid. Mortgages and home loansTypes of mortgages in New Zealand, and how to choose » Sorted

My overall recommendation

I'd start by comparing a standard principal-and-interest table loan, mostly fixed, with either a small flexible portion or generous penalty-free extra-repayment terms. Keep an emergency fund separate, and choose the loan based on the repayments you can comfortably sustain rather than the maximum the bank will lend you.

To make that more concrete, there's one useful starting point:

Roughly how much are you expecting to borrow? For example, NZ$500,000, NZ$700,000 or NZ$900,000.

I can use that to illustrate what the regular repayments might look like, how a split mortgage could work, and how paying extra could shorten your loan term.