ChatGPT · National
My partner and I are separating and have a joint mortgage. I'd like to keep the house if I can. What do I need to work out before speaking to the bank?
I’m sorry you’re going through this. If you’d like to keep the house, the best first step is to work out whether you can afford to take over the mortgage on your own, how much you’d need to pay your partner for their share, and what needs to happen legally to transfer the property into your name.
In New Zealand, keeping the house usually involves three separate things: reaching an agreement with your partner, getting the bank to approve the mortgage in your sole name, and sorting out the property ownership and legal paperwork. These are related, but solving one doesn't automatically solve the others.
Here’s what I’d work out before talking to the bank.
1. Work out what the house is worth and how much equity you have
Start by gathering the basic numbers.
| What to find out | Why it matters |
|---|---|
| Current market value of the house | Establishes the likely sale value |
| Outstanding mortgage balance | Shows how much you still owe |
| Any other loans secured against the property | These can affect the equity available |
| Likely selling costs, if relevant | Helps compare keeping the house with selling it |
Your rough equity is:
Current house value − outstanding mortgage = equity
For example, if the house is worth NZ$900,000 and the mortgage balance is NZ$550,000, your combined equity is approximately NZ$350,000.
That doesn't automatically mean your partner is entitled to half of that amount. Your actual settlement will depend on your relationship-property circumstances and any agreement you reach.
You can start with a recent council valuation or online estimate, but these are only guides. A registered valuation may be needed to establish a value you can both agree on or that the bank will accept.
2. Estimate how much you would need to pay your partner
If you want to own the house outright, you may need to buy out your partner's share of the equity.
For example, using the figures above:
Illustrative buyout calculation
House value
NZ$900,000
Less mortgage
− NZ$550,000
Combined equity
NZ$350,000
Illustrative half share
NZ$175,000
This assumes a 50/50 division, with no other adjustments, debts or settlement costs. It is an example, not a determination of your partner's legal entitlement.
The buyout might be funded by increasing the mortgage, using savings, or a combination of both.
Before settling on an amount, work out:
- Whether you and your partner agree on the home's value.
- Whether either of you has separate property, contributions or other circumstances that could affect the settlement.
- Whether other shared assets and debts should be included in the overall division.
- Whether you can afford any valuation, legal and mortgage-related costs.
In New Zealand, the family home is often relationship property, and equal sharing is the general starting point for couples covered by the Property (Relationships) Act 1976. The outcome can differ depending on your circumstances. See the Ministry of Justice's relationship-property guidance. Understand relationship propertyHow the Family Court divides relationship property
Important: Get advice from a family lawyer before committing to a final buyout figure.
3. Work out whether you can afford the mortgage on one income
This is often the biggest hurdle. The bank needs to be satisfied that you can manage the lending without your partner's income.
Make a realistic monthly budget based on your circumstances after separation, rather than your current shared household budget.
| Income and expenses | What to calculate |
|---|---|
| Income | Your take-home pay and any reliable additional income |
| Mortgage | Payments on the existing loan and any additional borrowing |
| Living costs | Food, power, transport, phone and other essentials |
| Dependants | Childcare, child-related expenses and any maintenance payments |
| Homeownership | Rates, insurance, repairs and ongoing maintenance |
| Other debt | Credit cards, personal loans, car finance and buy-now-pay-later commitments |
| Emergency buffer | Money left over for unexpected bills or changes in income |
Ask yourself three questions:
- Can I comfortably pay the mortgage on my own income?
- Can I afford the mortgage if interest rates rise when my fixed term expires?
- If I need to borrow extra to pay my partner out, can I afford the larger repayments?
Don't base your decision only on whether you can meet the repayments today. Keeping a house you cannot comfortably afford could leave you financially vulnerable.
4. Work out how much you would need to borrow
There are two different numbers to understand:
- The total mortgage you would need: the existing mortgage plus any additional amount needed for the buyout and associated costs.
- The mortgage the bank will approve: the amount it considers affordable and acceptable under its lending criteria.
For example, if your existing mortgage is NZ$550,000 and you need another NZ$175,000 to buy out your partner, your total borrowing could be around NZ$725,000 before any additional costs.
The bank will assess your income, expenses, existing debts, the property's value and its lending policies. A larger loan relative to the property's value may also affect the lending options available to you.
You do not need to know the exact final loan amount before speaking to the bank. A sensible estimate is enough to start the conversation.
5. Gather the paperwork before your bank appointment
You will make the conversation much more productive if you have the following information ready.
Preparation checklist
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Mortgage and property
Current mortgage balance and loan statements
Interest rate, fixed-term expiry dates and loan structure
Recent property valuation or market estimate
Any other loans secured against the property
Your finances
Recent payslips or evidence of income
Employment details and any variable income
Bank statements and a realistic budget
Details of credit cards, loans and other financial commitments
Savings available for the buyout and costs
Separation arrangements
A rough estimate of the proposed buyout amount
Any preliminary agreement about who keeps the house
Details of other shared assets and debts
Any existing relationship-property agreement
If you don't have everything yet, don't let that stop you from making an initial enquiry.
6. Understand the legal side before you make commitments
There are two separate questions to resolve:
- The bank: Will it agree to lend to you alone and release your partner from the mortgage?
- The legal ownership: Can the property be transferred into your sole name under an agreed and properly documented settlement?
Your partner generally remains liable for a joint mortgage until the lender formally releases them or the lending is otherwise discharged. A private agreement between the two of you does not, by itself, remove them from the loan.
It is also worth speaking to a family lawyer early. Where an agreement divides relationship property, New Zealand law generally requires it to be in writing, with each person receiving independent legal advice and the required lawyer witnessing and certification formalities. Separating from your spouse or partnerSeparation agreements & Orders
A lawyer can help you establish the appropriate buyout amount, prepare the agreement and coordinate the property transfer. Your bank may also require a conveyancing lawyer.
If you and your partner haven't agreed on the value or who keeps the house, you can still ask the bank about your potential borrowing capacity without treating the proposed buyout as final.
7. What to ask the bank
When you contact your lender, explain that you're separating and would like to retain the home. Ask:
- Can you assess whether I can take over the existing mortgage in my sole name?
- How much could I borrow in total on my current income?
- Could I borrow extra to buy out my partner's share?
- Would my existing interest rate or fixed-term arrangements change?
- What valuation and supporting documents would you require?
- What happens to the existing joint loan while the separation and transfer are being arranged?
- What fees, legal costs or other conditions should I budget for?
The initial goal is to get an indication of what is financially possible, not to finalise the entire separation at your first appointment.
Let's work out your position
If you're comfortable sharing some approximate figures, I can help you estimate the likely buyout and whether keeping the house looks financially realistic before you speak to the bank.
Enter estimates in New Zealand dollars. You can leave anything unknown blank.
You don't need to have everything figured out yet. The aim is to identify what would make keeping the house workable, and what you need to find out next.
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Captured 11 October 2026