New Zealand Mortgage Calculator 2026
Annual Principal vs Interest Breakdown
Your deposit meets RBNZ owner-occupier LVR requirements (effective 1 Dec 2025). You qualify for bank “special” rates — typically 0.2–0.5% below standard rates. A Low Equity Margin applies only if LVR exceeds 80%.
This mortgage repayment calculator NZ gives you weekly, fortnightly, and monthly repayments in seconds — with live May 2026 bank rates, a built-in RBNZ LVR compliance check, a debt-to-income (DTI) ratio test, interest-only modelling, extra repayment savings, and a full amortisation schedule. It’s the only free home loan calculator NZ that combines all of those into one tool. Read on for exact numbers, current rates, and everything the banks don’t explain clearly.
How this mortgage repayment calculator NZ works
Enter your property value and deposit. The NZ mortgage calculator subtracts the deposit from the property value to get your loan amount, then applies the standard amortisation formula used by every NZ bank. Each repayment covers interest on the outstanding balance plus a portion of principal. As the balance drops, less goes to interest and more to principal — which is why the chart above shows the interest bar shrinking year by year.
The formula is: P = L × [r(1+r)ⁿ] / [(1+r)ⁿ − 1] — where L is your loan, r is the periodic rate (annual rate ÷ payment frequency), and n is total payments. The calculator runs this calculation on every keystroke, so your numbers update live as you type.
What makes this home loan calculator NZ different
Most bank calculators — ANZ, ASB, BNZ, Westpac, Kiwibank — only show the repayment amount. This tool goes further:
| Feature | This Calculator | Bank Calculators | Sorted / MoneyHub |
|---|---|---|---|
| Weekly / fortnightly / monthly repayments | ✅ Yes | ✅ Most | ✅ Yes |
| Live 2026 bank rate presets | ✅ Yes | ⚠️ Own rates only | ❌ No |
| RBNZ LVR compliance status | ✅ Yes | ❌ No | ❌ No |
| DTI ratio check (RBNZ Jul 2024) | ✅ Yes | ❌ No | ❌ No |
| Interest-only period modelling | ✅ Yes | ⚠️ Some | ❌ No |
| Extra repayment savings & payoff date | ✅ Yes | ❌ No | ⚠️ Limited |
| Full amortisation schedule | ✅ Yes | ❌ No | ❌ No |
| Owner-occupier / FHB / investor modes | ✅ Yes | ❌ No | ❌ No |
How to use the NZ mortgage calculator — step by step
Select Owner-Occupier, First Home Buyer, or Investor at the top. Each mode changes the RBNZ LVR threshold checked (80% for owner-occupiers and FHBs, 70% for investors) and the DTI limit applied (6× for owner-occupiers and FHBs, 7× for investors).
Type in the purchase price and your deposit — either as a dollar amount or percentage. The slider adjusts both simultaneously. The LVR bar below turns green (within RBNZ limits), amber (Low Equity Margin applies), or red (approval unlikely at standard banks).
Choose 5 to 30 years and pick weekly, fortnightly, or monthly payments. Weekly payments reduce total interest faster because principal drops with every payment rather than once a month. The frequency pills in the results column let you view all 3 amounts without changing your loan structure.
Click a fixed term button — Floating, 6 Month, 1 Year, 2 Year, 3 Year, or 5 Year. The calculator pre-fills the current May 2026 average rate from ANZ, ASB, BNZ, Westpac, Kiwibank, and TSB. Override with your bank’s exact quoted rate to get precise figures.
Type any extra amount into the Extra Repayment field. The savings panel appears instantly showing total interest saved, years cut from the loan, and your new payoff date. Even $200 extra per month on a $600,000 loan saves approximately $47,000 in interest.
Open the DTI accordion and enter your gross household income and any existing debt (car loans, personal loans, credit card limits). The tool calculates your debt-to-income ratio, tells you whether it falls within RBNZ limits, and shows your maximum loan amount under the DTI rules.
Click “View Full Amortization Schedule” at the bottom. Every payment is listed — date, repayment amount, principal paid, interest paid, and remaining balance. Interest-only periods show in yellow. This is the same schedule your bank uses internally.
NZ home loan rates — May 2026
The RBNZ cut the Official Cash Rate (OCR) to 2.25% in November 2025 — its lowest point in this cycle. Banks immediately started moving fixed rates in response to higher swap market pricing rather than the OCR itself. By May 2026, fixed mortgage rates have moved upward across all terms. The 1-year fixed rate remains the most popular term in New Zealand, averaging around 4.96% p.a. across the major banks.
| Fixed Term | Avg. Rate (May 2026) | Lowest Available | Highest Available | Best for |
|---|---|---|---|---|
| Floating | 5.72% p.a. | ~5.50% | ~5.90% | Lump-sum repayments, short-term holds |
| 6 months | 5.29% p.a. | 4.49% | 5.49% | Maximum flexibility, rate-watch strategy |
| 1 year | 4.96% p.a. | ~4.59% | ~5.29% | Most NZ borrowers — flexibility + low rate |
| 2 years | 5.05% p.a. | 4.89% | 5.29% | Moderate certainty, hedge against hikes |
| 3 years | 5.15% p.a. | 5.29% | 5.69% | Certainty over rate-rise risk |
| 5 years | 5.29% p.a. | 5.59% | 6.19% | Maximum payment certainty, long-term planning |
Rates are not uniform across banks. The gap between the cheapest and most expensive 1-year rate across the big five banks can be 40–70 basis points at any time. BNZ, ASB, Kiwibank, ANZ, and Westpac all move independently — sometimes within hours of each other. Always compare current rates from each bank directly, or use a licensed mortgage broker who can access rates not listed publicly.
Fixed rate vs floating rate — which to choose in 2026
Floating rate (currently averaging 5.72%) makes sense for: revolving credit facilities, borrowers planning to sell within 12 months, or anyone needing unlimited extra repayments without break fees. The floating rate moves with the OCR and swap markets — it’s variable and can change at any time.
Fixed rates give certainty. You know exactly what your repayment is for the fixed period, which makes budgeting straightforward. The tradeoff: break fees can be substantial if you sell, refinance, or make large lump-sum payments during a fixed period. Most NZ banks allow extra repayments up to $500–$1,000 per month during a fixed term without triggering break costs — but check your specific loan terms.
In a rising rate environment like May 2026, most NZ borrowers are splitting their mortgage across 1- and 2-year fixed terms to balance short-term low rates against some rate-rise protection. This “split loan” strategy isn’t available in most bank calculators — but you can model each tranche separately using the calculator above.
NZ mortgage repayment examples — 2026 figures
These examples use the same formula as the mortgage repayment calculator NZ above. All figures are based on a 4.96% p.a. 1-year fixed rate, principal and interest repayments, and a 25-year term unless stated. Rounded to the nearest dollar.
| Property Value | 20% Deposit | Loan Amount | Monthly | Fortnightly | Weekly | Total Interest (25yr) |
|---|---|---|---|---|---|---|
| $500,000 | $100,000 | $400,000 | $2,344 | $1,172 | $586 | ~$303,200 |
| $650,000 | $130,000 | $520,000 | $3,047 | $1,523 | $762 | ~$394,100 |
| $750,000 | $150,000 | $600,000 | $3,517 | $1,758 | $879 | ~$455,100 |
| $900,000 | $180,000 | $720,000 | $4,220 | $2,110 | $1,055 | ~$546,100 |
| $1,100,000 | $220,000 | $880,000 | $5,158 | $2,579 | $1,289 | ~$667,400 |
| $1,500,000 | $300,000 | $1,200,000 | $7,034 | $3,517 | $1,758 | ~$910,200 |
Impact of loan term on monthly repayments
| Loan Term | Monthly Repayment | Total Interest Paid | Extra vs 30yr (interest) |
|---|---|---|---|
| 30 years | $3,199 | ~$567,640 | Baseline |
| 25 years | $3,517 | ~$455,100 | Save ~$112,500 |
| 20 years | $3,963 | ~$351,120 | Save ~$216,500 |
| 15 years | $4,742 | ~$253,560 | Save ~$314,100 |
| 10 years | $6,325 | ~$159,000 | Save ~$408,600 |
Cutting from 30 years to 25 years costs $318 more per month but saves $112,500 in total interest. That’s one of the most high-value financial decisions a NZ homeowner can make. Run the numbers for your loan in the calculator above using the Loan Term dropdown.
RBNZ LVR rules 2026 — NZ mortgage deposit requirements
The Reserve Bank of New Zealand (RBNZ) sets Loan-to-Value Ratio (LVR) restrictions that govern how much low-deposit lending each bank can do. These are not limits on individual borrowers — they’re “speed limits” on each bank’s total new lending. Banks can still approve high-LVR loans up to those limits. The rules were most recently updated on 1 December 2025 when the RBNZ eased the restrictions.
| Borrower Type | High LVR Threshold | Minimum Deposit | Bank Speed Limit | Low Equity Margin |
|---|---|---|---|---|
| Owner-Occupier | Above 80% LVR | 20% | 25% of new lending (↑ from 20%) | ~0.25–0.75% p.a. until ≤80% |
| First Home Buyer | Above 80% LVR | 20% (5% via Kāinga Ora FHL) | Within the 25% owner-occupier limit | ~0.25–0.75% p.a. until ≤80% |
| Investor | Above 70% LVR | 30% | 10% of new lending (↑ from 5%) | ~0.50–1.00% p.a. until ≤70% |
LVR restrictions do not apply to: Kāinga Ora First Home Loans, construction loans for new builds, refinancing where the new loan doesn’t exceed the original balance, bridging finance, or portability when shifting a loan to another property at the same balance.
NZ mortgage DTI rules — debt-to-income ratio explained
Debt-to-Income restrictions took effect on 1 July 2024. They work the same way as LVR speed limits — they cap how much high-DTI lending each bank can approve across its total book, not whether any individual borrower can get a loan. Up to 20% of a bank’s new lending can go to borrowers above the DTI limit — which means high-DTI applications are harder, not impossible.
How to calculate your DTI ratio
DTI = Total Debt ÷ Gross Annual Household Income.
Total debt includes: the new mortgage, all existing mortgages, car loans, personal loans, student loans, and credit card limits (not balances — the full limit counts). It does not include rent payments.
Gross income is total before-tax income from all borrowers on the application — salary, wages, rental income, and declared self-employment income.
| Borrower Type | DTI Limit | Bank Speed Limit Above | Example: $120k income |
|---|---|---|---|
| Owner-Occupier | 6× gross income | 20% of new lending | Max $720,000 total debt |
| First Home Buyer | 6× gross income | 20% of new lending | Max $720,000 total debt |
| Investor | 7× gross income | 20% of new lending | Max $840,000 total debt |
Open the DTI Check accordion in the calculator above, enter your household income and existing debt, and your ratio is calculated instantly. If you’re above the limit, the tool also shows your maximum borrowing capacity under the DTI rules.
First home buyer mortgage calculator NZ — special rules and options
First home buyers have access to 3 tools that don’t apply to other borrowers. Each one changes the numbers you should put into this first home buyer mortgage calculator NZ.
Kāinga Ora First Home Loan
The Kāinga Ora First Home Loan lets eligible first home buyers borrow with as little as 5% deposit through selected participating banks (ANZ, ASB, BNZ, Westpac, Kiwibank, TSB, and others). These loans are fully exempt from RBNZ LVR restrictions — so the LVR bar in the calculator above doesn’t apply to them. Income caps and purchase price limits apply and vary by region. Confirm current thresholds directly with Kāinga Ora or a mortgage adviser.
KiwiSaver first-home withdrawal
After 3 years of contributing to KiwiSaver, most members can withdraw their full balance (minus $1,000 which must remain in the account) towards a first home purchase. This is the most commonly available source of deposit top-up for first home buyers. Your employer contributions and the government member tax credits (MTC) count towards the withdrawal. Check your eligibility and balance at IRD’s KiwiSaver first home withdrawal guide.
Once you know how much you can withdraw, add it to your deposit figure in the home loan calculator NZ above to see how it affects your LVR and repayments.
Interest-only mortgage calculator NZ — how it works and who uses it
During an interest-only period, your repayments cover only the interest on the loan. The principal balance stays the same. Repayments are lower — but total interest paid over the life of the loan is higher, because you spend more time with the full balance accruing interest.
Interest-only vs principal and interest — worked example
| Scenario | Monthly Repayment (IO period) | Monthly Repayment (after IO) | Total Interest (25yr) |
|---|---|---|---|
| P&I from day 1 | $3,517 | $3,517 | ~$455,100 |
| 2 years IO then P&I (23yr remaining) | $2,480 (IO) | $3,749 (P&I over 23yr) | ~$498,200 |
| 5 years IO then P&I (20yr remaining) | $2,480 (IO) | $3,963 (P&I over 20yr) | ~$537,300 |
A 5-year interest-only period costs roughly $82,000 more in total interest compared with principal-and-interest from day 1. That’s the real cost of the lower repayments during the IO phase. Property investors often use interest-only periods because the interest portion is tax-deductible on investment properties — making the after-tax cost closer to a P&I loan.
Select any IO period in the Interest-Only Period dropdown in the calculator above. Yellow rows in the amortisation schedule mark IO payments — no principal reduces during those periods.
Extra repayment savings — NZ home loan payoff calculator
Extra repayments are one of the highest-return financial moves available to NZ homeowners. Every extra dollar paid goes directly to reducing the principal balance — which immediately reduces the interest calculated on the next payment.
| Extra Per Month | Total Interest Saved | Years Saved | New Payoff Date |
|---|---|---|---|
| $100 | ~$24,800 | ~1.3 years | ~Apr 2050 |
| $200 | ~$46,900 | ~2.5 years | ~Nov 2048 |
| $500 | ~$99,400 | ~5.4 years | ~Nov 2045 |
| $1,000 | ~$155,600 | ~8.7 years | ~Aug 2042 |
Type your extra repayment amount into the Extra Repayment field above. The savings panel shows your exact interest saved and new payoff date based on your specific loan amount and rate — not generic examples.
One practical note: most NZ banks allow extra repayments during a fixed term up to a threshold (often $500–$1,000 per month) without triggering break fees. Above that, they may charge. If you plan to make large extra repayments regularly, a floating or revolving credit structure may cost less in break fees even at a higher base rate.
Frequently asked questions — NZ mortgage calculator
On a $700,000 loan at 4.96% p.a. over 25 years, monthly repayments are approximately $4,103. At a floating rate of 5.72%, repayments rise to approximately $4,406/month. These figures are principal and interest. For a $750,000 property with 6.67% deposit ($50,000), the loan would be $700,000 — but your LVR would be 93.3%, which is above RBNZ limits and unlikely to be approved without a Kāinga Ora First Home Loan. Enter your exact numbers into the mortgage repayment calculator NZ above for precise figures.
Owner-occupiers and first home buyers need 20% deposit for standard bank approval (80% LVR). Investors need 30% for existing properties (70% LVR). First home buyers can access the Kāinga Ora First Home Loan with as little as 5% deposit, subject to income and purchase price caps. Banks can lend above these thresholds within RBNZ speed limits (25% of new owner-occupier lending, 10% of new investor lending from 1 December 2025) — but those loans attract a Low Equity Margin of roughly 0.25–0.75% extra interest. New builds are exempt from standard LVR restrictions entirely.
The average 1-year fixed home loan rate across ANZ, ASB, BNZ, Westpac, Kiwibank, and TSB is approximately 4.96% p.a. as of May 2026. Individual bank rates range from around 4.59% to 5.29% depending on the lender and your LVR. Banks with LVR above 80% will typically add a Low Equity Margin on top of the advertised rate. Rates change frequently — sometimes daily — so always confirm the current rate with your bank or broker before making decisions.
RBNZ DTI restrictions (in force since 1 July 2024) cap how much of a bank’s new lending can go to high-DTI borrowers. Owner-occupiers and first home buyers are limited to 6× gross annual household income across all debt. Investors are limited to 7×. For example, a household earning $120,000 gross can have total debt (mortgage plus car loans, credit cards, etc.) of up to $720,000 under the 6× rule. Banks can still lend to up to 20% of borrowers above the DTI limit — but high-DTI applications need a stronger overall profile. Use the DTI accordion in the home loan calculator NZ above to check your ratio instantly.
In May 2026, the average 1-year rate (4.96%) is lower than the 2-year rate (5.05%). Most major bank economists expect the OCR to stay at 2.25% through 2026, but swap markets are pricing in future hikes — pushing longer-term rates higher. Fixing for 1 year gives you the lower current rate and lets you refix when the term ends. If rates rise by early 2027 as economists predict, 2-year fixing now provides certainty at a rate that may look cheap in hindsight. Many NZ borrowers split across both terms — a strategy that balances cost against rate-rise risk. Speak with a licensed mortgage broker for advice specific to your situation.
This NZ mortgage calculator uses the same standard amortisation formula that all NZ banks use. For monthly repayments, interest is calculated on the outstanding balance each period. Results are accurate to within a few dollars of what your bank would show — differences arise from rounding conventions and how banks handle the exact number of days per period. The calculator does not account for bank establishment fees ($0–$150 typically), legal costs, or property valuation fees. Actual repayment amounts may differ slightly from your bank’s offer document. Always confirm with your lender before making financial decisions.
On a $500,000 loan at 4.96% p.a. over 25 years, weekly repayments are approximately $541. Fortnightly repayments are approximately $1,081. Monthly repayments are approximately $2,344. At a floating rate of 5.72%, weekly repayments rise to approximately $576. Use the frequency pills in the home loan calculator NZ above to switch between views instantly — the underlying loan structure stays the same, only the display frequency changes.
LVR = Loan Amount ÷ Property Value × 100. For example, a $480,000 loan on a $600,000 property gives an LVR of 80%. The deposit in this case is $120,000 (20%). For owner-occupiers, an LVR at or below 80% meets RBNZ requirements and qualifies for bank “special” rates — typically 0.2–0.5% below standard carded rates. Above 80% LVR, a Low Equity Margin applies. The LVR bar in the mortgage repayment calculator NZ above calculates and displays your LVR automatically as you adjust the property value and deposit.