New Zealand Mortgage Calculator

Based on RBNZ B20 lending rate statistics (April 2026):

• Floating owner-occupier: approximately 5.66% p.a.
• 1-year fixed (owner-occ): approximately 4.91% p.a. (best buys from ~4.39%)
• 2-year fixed (owner-occ): approximately 5.29% p.a. (best buys from ~4.69%)
• Floating investor: approximately 6.16% p.a.

The RBNZ Official Cash Rate (OCR) is 2.75% p.a. (raised 2 September 2026) — mortgage rates sit roughly 2.4–3.7 percentage points above the OCR. Best buy rates (advertised carded specials) typically run 0.50–1.00% below the average.

A Low Equity Premium (LEP) — sometimes called a Low Equity Margin — is an additional interest rate margin charged when LVR exceeds 80%. Unlike Australian LMI which is a one-off lump-sum payment, NZ's LEP is charged as an ongoing rate increase.

Typical LEP margins:

• LVR 80–85%: ~0.25–0.50% above standard rates
• LVR 86–90%: ~0.50–1.00% above standard rates
• LVR 91%+: ~1.00–1.50% above standard rates (where available)

Once your LVR drops below 80% (through repayments or property revaluation), you can request the LEP be removed at refix time. Eligible Kāinga Ora First Home Loan borrowers avoid LEP entirely.

Common home loan fees include:

• Application / establishment fee: NZD 200–500 one-off (some lenders waive)
• Legal fees (conveyancing): NZD 1,500–3,500 for property purchase
• Valuation fee: NZD 600–1,200 (registered valuation often required at high LVR)
• LIM report: NZD 200–400 (Land Information Memorandum from local council)
• Builder's report: NZD 500–1,000 (recommended for older homes)
• Discharge fee: NZD 50–200 when loan is closed
• Break fee: on fixed-rate loans if exited early — calculated on rate differential, can be substantial
• LEP rate margin: ongoing if LVR exceeds 80%

NZ has no stamp duty on property purchases. Per Sorted, request a full fee schedule before committing.

The impact of a rate difference is substantial due to compounding over a long term. On a NZD 640,000 loan over 30 years:

• At 5.66% p.a.: total interest is approximately NZD 690,000
• At 5.16% p.a. (0.50% lower): total interest is approximately NZD 620,000 — a saving of ~NZD 70,000
• At 6.16% p.a. (0.50% higher): total interest is approximately NZD 762,000 — an extra cost of ~NZD 72,000

Even a 0.25% rate difference on a NZD 640k loan saves or costs approximately NZD 35,000 over 30 years. Refixing at a competitive rate — or refinancing when better rates appear — is therefore high-value action.

A fixed rate gives certainty — repayments do not change for the fixed period (typically 1–5 years), regardless of OCR movements. It suits borrowers who need budget certainty or expect rates to rise during the fixed period. Extra repayments are usually capped (often NZD 5,000/year) and break costs apply on early exit.

A floating rate moves with market rates — borrowers benefit from cuts but are exposed to rises. Floating loans usually allow unlimited extra repayments and no break costs. Per RBNZ, around 85% of New Zealand mortgages are on fixed terms — most for 1 or 2 years. A split loan (part fixed, part floating) combines certainty on a portion with flexibility on the rest.

It depends which of two different arrangements is meant, and the difference is large.

Equivalent fortnightly — the same repayment split into 26 instalments over the same term — is close to neutral. On a NZD 640,000 loan at 5.66% p.a. over 30 years that saves about NZD 1,600 across the full term and does not shorten it.

Paying half the monthly repayment every fortnight is the arrangement that produces the large figures: 26 half-payments add up to 13 monthly repayments a year. On the same loan that saves approximately NZD 135,000 in interest and cuts around 5.2 years off the term. The saving comes from paying down principal faster — not from frequency alone. Aligning repayment frequency with the pay cycle is the most practical approach. Note: most fixed-rate loans require a refix or restructure to change frequency.

Extra repayments directly reduce the outstanding principal, so less interest accrues on every future repayment. On a NZD 640,000 loan at 5.66% over 30 years:

• Adding NZD 500/month extra saves approximately NZD 170,000 in total interest and cuts around 7–8 years off the loan
• Adding NZD 200/month saves ~NZD 85,000 and 4 years

Savings are largest when extra repayments are made early in the loan — because the balance (and therefore the interest charged) is highest. Fixed-rate loans typically cap extra repayments (often NZD 5,000/year) and may charge break costs — check your loan contract before making large lump sums.

Break fees are charged when a fixed-rate loan is paid off early or repaid above the contracted minimum, before the fixed term ends. They compensate the lender for the difference between the loan's fixed rate and the current wholesale rate.

Break fees are highest when interest rates have fallen since fixing. For example, a borrower who fixed at 7.5% in 2023 and now wants to break to refix at 5.0% would face material break costs because the lender priced their funding against the higher rate. Break fees can be significant — sometimes tens of thousands of dollars on larger loans. Always request a written break fee quote before deciding to break.

Mortgage stress is commonly defined as spending more than 30% of gross household income on mortgage repayments. Most NZ banks apply a serviceability buffer when assessing affordability — typically testing your ability to service the loan at a higher stressed rate (often 7–8% even when the actual rate is 5–6%).

To reduce risk: keep LVR below 80%, build a 3–6 month repayment buffer in a revolving credit account, choose the shortest loan term comfortably affordable, and review the rate at every refix. Borrowers experiencing hardship can contact their lender — under the Credit Contracts and Consumer Finance Act (CCCFA), they have the right to request a hardship variation.

New Zealand first home buyers have access to several schemes:

• Kāinga Ora First Home Loan: buy with a 5% deposit without LEP. Available through Westpac, Kiwibank, and SBS Bank. Income and house price caps apply.
• KiwiSaver First Home Withdrawal: withdraw most of your KiwiSaver balance (must leave NZD 1,000 minimum) for a deposit if you have been a member for at least 3 years (IRD).
• Kāinga Ora First Home Partner: shared ownership scheme where Kāinga Ora co-purchases up to 25% of the property.

Important: the previous First Home Grant of up to NZD 10,000 was discontinued on 22 May 2024 — funds were redirected to social housing. Don't budget for it. New Zealand has no stamp duty on property purchases.

The Kāinga Ora First Home Loan is a government-underwritten loan that allows eligible first home buyers (or second-chance buyers) to purchase a home with as little as a 5% deposit and no Low Equity Premium. The government underwrites part of the loan, so banks can lend at standard rates without LEP.

Key eligibility criteria:

• Income caps: approximately NZD 95,000 (single) / NZD 150,000 (couple) — verify current thresholds
• House price caps: vary by region — Auckland ~NZD 875k, Wellington ~NZD 750k, other ~NZD 500–700k
• Must intend to live in the property as the principal place of residence for 12 months minimum
• Available lenders: Westpac, Kiwibank, SBS Bank (subject to bank-specific criteria)

The KiwiSaver First Home Withdrawal allows eligible first home buyers (or second-chance buyers) to withdraw most of their KiwiSaver balance to use as a home deposit, provided they have been a KiwiSaver member for at least 3 years.

Per IRD, the rules are:

• Must have been a KiwiSaver member for at least 3 years
• Must intend to live in the property as your principal place of residence
• Must leave a minimum balance of NZD 1,000 in your KiwiSaver account
• The withdrawal includes your contributions, employer contributions, and most government contributions
• No tax penalty applies
• Apply through your KiwiSaver provider

The withdrawal can be combined with a Kāinga Ora First Home Loan to enable a 5% deposit purchase without LEP.

Most lenders require a minimum deposit of 10% of the purchase price (sometimes 5% via the Kāinga Ora First Home Loan). However, RBNZ LVR rules limit how much new lending banks can do above 80% LVR — currently 25% of new owner-occupier lending.

For a NZD 800,000 property:

• 5% deposit (via Kāinga Ora): NZD 40,000 + no LEP
• 10% deposit (standard high-LVR): NZD 80,000 + LEP rate margin
• 20% deposit (no LEP): NZD 160,000 + best rates available

For investors, RBNZ requires a minimum 30% deposit (LVR ≤70%). Additional upfront costs include legal fees (NZD 1,500–3,500), LIM report (NZD 200–400), and registered valuation if required (NZD 600–1,200).

From 1 July 2024, RBNZ has applied Debt-to-Income (DTI) restrictions on new mortgage lending. The DTI is total household debt divided by total gross household income.

The current rules:

• Owner-occupiers: banks may originate 20% of new commitments at DTI greater than 6
• Investors: banks may originate 20% of new commitments at DTI greater than 7
• Exclusions: Kāinga Ora loans, new builds, refinancing without an increase, bridging finance

For a couple earning NZD 200,000 gross, the standard limit (DTI 6) means borrowing up to ~NZD 1,200,000. Most first home buyers fall well below this cap, but high-end Auckland borrowers can be restricted. Banks also apply their own serviceability test at a stressed rate.

Per IRD, mortgage interest on a residential investment property is fully deductible (100%) against rental income from 1 April 2025 — completing the reversal of the 2021 phase-out. The 100% deduction applies regardless of when the property was acquired.

However, ring-fencing rules apply: if total deductible expenses (including interest) exceed rental income, the resulting rental loss cannot be offset against other assessable income (such as salary). The loss is ring-fenced and can only offset future rental income or capital gains under the bright-line test. Mortgage interest on a primary place of residence (owner-occupied) is not tax deductible.

The bright-line test taxes capital gains on residential property sold within a defined period. From 1 July 2024, this period was reduced to 2 years from the date of acquisition (down from 10 years under the previous Labour government rules).

Per IRD:

• 2-year bright-line: applies to all residential property sold on or after 1 July 2024
• Tax rate: the gain is added to your taxable income at your marginal rate (up to 39%)
• Main home exclusion: generally exempt if used predominantly as your main home for the whole period
• Calculation: sale price minus cost base (purchase price + acquisition costs + capital improvements)

Outside the 2-year bright-line window, NZ has no general capital gains tax on residential property — a major difference from Australia.

For investment property mortgages, a revolving credit account is generally preferable to making extra repayments — for tax reasons.

Per IRD, if extra repayments are made and then later redrawn for private use, the IRD may treat the redrawn funds as a new private loan — making the interest on that portion non-deductible. Money held in a revolving credit account retains its character (private savings) and does not affect the loan's tax-deductible status. The structure also lets you absorb rental income into the offset, reducing daily interest charged.

For owner-occupied properties, the distinction is less important because the interest is not deductible anyway — extra repayments via redraw are equally effective.

Per RBNZ macroprudential policy (effective from 1 December 2025):

• Minimum deposit: 30% (LVR ≤ 70%) — banks may originate up to 10% of new investor commitments above 70% LVR
• DTI cap: 20% of new investor lending may be at DTI greater than 7
• Interest deductibility: 100% of mortgage interest deductible against rental income (from 1 April 2025)
• Rental losses ring-fenced: cannot offset other income
• Bright-line test: 2 years for properties acquired from 1 July 2024
• Standard rates: investor floating ~6.16% p.a. (~0.50% premium over owner-occ)

Auckland investors typically need ~NZD 300,000 deposit on a NZD 1,000,000 property to clear LVR rules, plus serviceability and DTI tests.

How table loan, IO, revolving credit, and affordability calculations are performed — these are the same formulas used by all New Zealand lenders.