NZ Mortgage Calculator
Calculate your mortgage repayments for a New Zealand home loan. See monthly, fortnightly, or weekly payments with a full amortization schedule showing principal vs interest over time.
Key Takeaway
Paying fortnightly instead of monthly means you make 26 half-payments per year (equivalent to 13 monthly payments), which can shave years off your mortgage.
Key Facts
Typical Rate
6–7%
LVR Limit
80% (no LMI)
Loan Terms
15–30 years
Fortnightly
Saves interest
How NZ Mortgages Work
A mortgage in New Zealand is a loan secured against property. Most home loans are table loans where you make equal repayments over the life of the loan. Each payment covers both interest and principal, with the interest portion decreasing over time as the balance reduces.
NZ banks offer both fixed and floating interest rates. Fixed rates are locked for a set period (typically 1–5 years), providing payment certainty. Floating rates can change at any time but offer more flexibility for extra repayments. Many borrowers split their mortgage between fixed and floating portions.
The Reserve Bank of New Zealand (RBNZ) sets LVR restrictions that affect how much banks can lend. Most owner-occupiers need at least a 20% deposit. First-home buyers may qualify for lower deposits through Kainga Ora’s First Home Loan scheme or bank-specific exemptions, though low-equity premiums (higher rates) typically apply.
Choosing a shorter loan term (e.g., 15 or 20 years instead of 30) means higher repayments but significantly less total interest. Similarly, making extra repayments when possible — even small amounts — reduces your principal faster and can save tens of thousands in interest over the life of the loan.
Frequently asked questions
How is the mortgage repayment calculated?
Repayments are calculated using the standard annuity formula: M = P × [r(1+r)^n] / [(1+r)^n - 1], where P is the loan amount, r is the periodic interest rate, and n is the total number of payments. This produces equal payments over the life of the loan, with each payment split between principal and interest.
What is LVR and why does it matter?
LVR (Loan-to-Value Ratio) is the loan amount as a percentage of the property value. In New Zealand, the Reserve Bank sets LVR restrictions. Most owner-occupiers need at least a 20% deposit (80% LVR) to avoid low-equity premiums or being declined. First-home buyers may qualify for exceptions allowing up to 90% LVR.
What is the difference between fixed and floating rates?
A fixed rate is locked in for a set period (typically 1-5 years), giving certainty on repayments. A floating rate can change at any time based on market conditions. Most NZ borrowers split their loan between fixed and floating portions. Fixed rates are usually lower but you pay break fees if you repay early.
How does paying fortnightly save interest?
Paying fortnightly instead of monthly means you make 26 half-payments per year, which equals 13 monthly payments instead of 12. The extra payment goes entirely to principal, reducing your loan balance faster and saving significant interest over the life of the loan. On a typical 30-year mortgage this can save several years of repayments.
Can I make extra repayments on my mortgage?
Yes, most NZ mortgages allow extra repayments on the floating portion without penalty. Fixed-rate loans typically allow limited extra repayments (often up to 5% of the loan per year) before break fees apply. Making even small regular extra payments can significantly reduce your total interest and loan term.
What deposit do I need to buy a house in New Zealand?
Most banks require a minimum 20% deposit for owner-occupiers. First-home buyers may qualify for a lower deposit of 10-15% through Kainga Ora First Home Loan or bank exemptions, though a low-equity premium (higher interest rate) usually applies. You can also use your KiwiSaver savings and the First Home Grant to help with the deposit.
Sources
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Last updated April 2026.