The questions and original answers

Moving your mortgage to another lender in New Zealand is usually manageable, but it can feel a lot like applying for a home loan again. The new lender will generally reassess your income, expenses, debts, credit history and the equity you have in your home before deciding whether to approve the switch.

The good news: if your finances are straightforward, your income is stable and you have built up reasonable equity, the paperwork is usually quite routine. The main work is gathering documents, completing the application and arranging the transfer with your new and existing lenders.

1. What information will you need?

Here's a practical checklist of what a New Zealand lender will commonly ask for.

Proof of income

• If employed: usually your two most recent payslips, and sometimes your employment contract.
• If self-employed: commonly the last two years of business financial statements and personal tax returns.
• Evidence of other income, such as rent, bonuses or benefits, if applicable.

Bank statements and living expenses

• Recent transaction histories, often covering the last three months.
• Regular spending, childcare, insurance, rates and other household costs.
• Details of credit cards, overdrafts, personal loans, car finance and Buy Now Pay Later accounts.

Existing mortgage and property

• Your current mortgage balance, loan statements, interest rates and fixed-rate expiry dates.
• Your property's address and an estimate of its current value.
• Details of other properties or rental income, if relevant.
• Home insurance details and, if requested, a property valuation.

Identification and application details

• Proof of identity and any requested address or residency evidence.
• Details of all borrowers, and any guarantors or trusts involved.
• Your preferred loan amount, repayment structure and whether you want to borrow extra.

Exact requirements vary by lender and your circumstances. BNZ's published refinancing checklist is one example of the documents banks may request. Refinancing your home loanPreparing for a home loan appointment

2. How much work is involved?

For a straightforward refinance, expect a few rounds of paperwork and conversations rather than starting entirely from scratch with your finances.

Step 1 — Compare offers

Low effort

Compare interest rates, fees, cashback offers, loan features and the cost of leaving your current lender. A mortgage adviser can help with this.

Step 2 — Gather documents and apply

Moderate effort

Complete an application, supply income and bank records, disclose your debts and expenses, and explain what you want from the new loan. Both borrowers generally need to participate in a joint application.

Step 3 — Wait for assessment and approval

The lender checks whether the loan is affordable and suitable, and may request further information or a valuation. Stable income and straightforward finances generally make this stage easier.

Step 4 — Sign and transfer the mortgage

Complete the new loan documents, arrange any required legal work and insurance confirmation, and coordinate repayment of the old mortgage. Some lenders offer streamlined refinance services for eligible borrowers.

How long does it take? As a practical planning estimate, allow several weeks from application to completion. A simple switch may be quicker, while a self-employed application, a complex ownership structure, low equity or extra borrowing can extend the process. There isn't a guaranteed timeframe across all NZ lenders.

Banks still have to assess affordability and suitability under New Zealand's responsible lending requirements. What lenders must doRefinancing your home loan

3. What costs should you check before switching?

This is often the most important part of deciding whether moving lenders is worthwhile.

Potential cost	What to check
Fixed-rate break fee	Ask your current lender for a written estimate if your fixed term hasn't ended.
Cashback repayment	Check whether you must repay some of a previous cash contribution.
Legal fees	Budget for mortgage discharge and registration work, unless the new lender offers an eligible streamlined option.
Valuation or application fees	Ask whether a valuation is required and whether any application or establishment fees apply.
Adviser fees	Check whether the adviser charges you directly or whether any commission clawback could result in a fee.

These costs can offset the benefit of a lower interest rate, so compare the total cost of switching against the savings over the period you expect to keep the loan. Refinancing your mortgageMortgage adviceUnfair fees

4. How can you make the process easier?

• Start gathering documents before you formally apply.
• Ask your current lender for a retention offer. They may be willing to improve your rate without you needing to switch.
• If possible, plan around the expiry of your fixed rate to reduce the risk of break fees.
• Get a written breakdown of the new lender's rates, fees, cashback conditions and loan features.
• Consider a mortgage adviser if you'd prefer someone to compare lenders and coordinate the application. Ask how they're paid and whether any fees could apply to you.

5. Let's estimate how much work it would be in your situation

The biggest factors are how much equity you have, how you earn your income, and whether your current mortgage is fixed or floating.

Optional — choose the closest answers for a tailored estimate.

You don't need to have all the numbers worked out yet. Even approximate answers are enough to identify whether your switch is likely to be relatively straightforward or require more preparation.