Free House Deposit Savings Calculator for New Zealanders
Work out how long it takes to save a deposit for your first home. The calculator factors in your current savings, KiwiSaver balance, and how much you can save each month.
Your savings plan
Based on saving $1,500/month towards a 20% deposit on an $800,000 home.
About our House Deposit Savings Calculator
The deposit, not the loan, is the bottleneck on most NZ first-home purchases. A 20% deposit on an $800,000 home is $160,000, and at $1,500 a month it takes seven years to save from a standing start, longer than the typical NZ income takes to outpace house-price inflation.
The calculator runs the simple maths against the four levers you control: target house price, target deposit percentage, current savings, and monthly saving rate. KiwiSaver counts as savings if you intend to use the First Home WithdrawalFirst Home WithdrawalPermission to withdraw KiwiSaver balance (minus $1,000) toward buying your first home.View in glossary →, which lets you take most of your balance (leaving $1,000) toward a deposit on a first home after three years of contributions.
The 20% target sits at the standard LVRLVRLoan-to-Value Ratio; loan as a percentage of property value. RBNZ caps it at 80% for owner-occupiers.View in glossary → threshold. Below 20%, banks add a low-equity margin to the contract rate, which on a $600,000 loan adds $1,500 to $9,000 a year of extra interest. Above 30% or so, the bank’s scrutiny eases and rate matrices stop adding penalty bands.
Move the deposit toggle between 10%, 20%, and 30% to see how target shifts. Move the monthly-saving slider to see how an extra $200 a month toward the deposit shrinks the timeline by months or years, depending on house price.
How to use it
Enter the target house price (or use the slider for a quick scan). For sense-checking against the current NZ market, the REINZ monthly House Price Index lists median prices by region and city.
Enter your current savings. Combine personal savings with the KiwiSaver balance you intend to withdraw, leaving $1,000 in KiwiSaver as required. Family gifts can also count if formally documented.
Enter your monthly saving rate from take-home pay, after rent and living costs. The calculator returns the months to reach the target, the dollar gap remaining, and an approximate ready date you can match against your home-buying timeline.
Why use it
NZ first-home buyers usually overestimate how quickly they can save and underestimate how much they need. Setting a target deposit and a monthly saving rate side by side often shows the timeline is two to three years longer than expected, which is the crucial information for someone trying to decide between renting one more year and buying with a smaller deposit now.
The calculator also makes the 20%-vs-10% trade-off concrete. Buying at 90% LVR with a 0.75% low-equity margin on a $540,000 loan costs about $4,000 a year in extra interest. Saving for another two years to cross the 80% line pushes off a purchase by 24 months, during which house prices may rise more than the saving covers.
For buyers planning around the KiwiSaver withdrawal, the calculator shows how much of the deposit comes from each source. Many first-home buyers find their KiwiSaver balance covers 60-70% of the deposit on a regional house, which changes the conversation about how much personal saving is needed.
The maths behind it
Months to save = (Target deposit − Current savings) ÷ Monthly saving Target deposit is the percentage you choose (10%, 20%, or 30%) of the target house price. Current savings includes personal savings plus any KiwiSaver balance you can access through the First Home Withdrawal (leaving the $1,000 minimum). Monthly saving is what you can put aside each month from take-home pay, after rent and living costs. The calculator does not compound investment returns on the savings; for short horizons (under 3 years) the difference is small, and most NZ first-home savings sit in low-yield bank accounts or KiwiSaver conservative funds.
Worked example
Sasha, marketing coordinator in Rotorua, on $86,000, targeting a $650,000 first home.
Sasha has $42,000 in personal savings and $28,000 in KiwiSaver. She wants a $650,000 three-bedroom house in Rotorua and is aiming for the standard 20% deposit so her bank does not apply a low-equity margin.
Target deposit is 20% × $650,000 = $130,000. Sasha’s combined starting position is $42,000 + $27,000 (KiwiSaver minus the $1,000 that has to remain) = $69,000.
The gap is $61,000. At $1,800 a month from her take-home pay, she gets there in roughly 34 months, or just under three years.
Pushing to 30% would lift the target to $195,000 and stretch the timeline to 70 months. Dropping to 10% would put the target at $65,000, which Sasha is already four months past, but a 90% LVR loan would attract a low-equity margin of around 0.5% to 1.5% on top of the contract rate.
Things to keep in mind
- Banks may want more than 20%. The 20% line is the standard threshold below which the low-equity margin disappears, but some banks ask for more (often 30% for investors, or above the line for high-DTI first-home buyers). The calculator targets the headline percentage; verify the actual ask with the bank.
- <span class="term" tabindex="0" aria-describedby="term-tip-first-home-withdrawal">KiwiSaver First Home Withdrawal<span class="term__tip" role="tooltip" id="term-tip-first-home-withdrawal"><strong>First Home Withdrawal</strong><span class="term__tip-def">Permission to withdraw KiwiSaver balance (minus $1,000) toward buying your first home.</span><a href="/glossary/#first-home-withdrawal" class="term__tip-link">View in glossary →</a></span></span>. You can withdraw most of your KiwiSaver balance toward a first home, leaving $1,000 in the account. Eligibility requires three years of contributions, NZ residency, and using the home as your main residence for at least six months.
- Kāinga Ora First Home Grant ended in May 2024. The First Home Grant (formerly $5,000 for an existing home or $10,000 for a new build) was discontinued from 22 May 2024. Calculators or articles referencing the grant for purchases after that date are out of date.
- Investment returns on savings are not modelled. For most first-home buyers, savings sit in a bank account or KiwiSaver conservative fund returning 3-5%. Over a 1-3 year saving window the compounding effect adds 1-3% to the eventual balance, which is small enough to round into the noise.
- Bank value is what counts. The bank tests LVR against its own valuation of the property, not against the price you pay. If the registered valuer comes back below the asking price, your deposit needs to cover the gap or the bank reduces the loan.
NZ-specific notes
FAQs
Is 20% always required?
No. NZ banks can lend above 80% LVR, but only on a small share of their new lending each month under the Reserve Bank’s LVR speed limits, and they typically charge a low-equity margin of 0.5% to 1.5% on top of the contract rate. Many first-home buyers go through with 10% or 15% deposits and accept the higher rate while they pay down to 80%.
Can my whole deposit come from KiwiSaver?
Yes, in principle. The First Home Withdrawal lets you take most of your balance (leaving $1,000) toward a first-home deposit. If your KiwiSaver balance covers 20% of the purchase price plus settlement costs, you can buy without any additional personal savings. In practice, most buyers combine KiwiSaver with personal savings.
What about the First Home Grant?
The Kāinga Ora First Home Grant ended on 22 May 2024 and is not currently being replaced. Calculators and articles referencing the grant for purchases after that date no longer apply. Eligible buyers who applied before the cutoff can still claim under the old rules.
How does the calculator handle compound returns on savings?
It does not. For most first-home savings, the funds sit in a bank account or KiwiSaver conservative fund returning 3-5%, and the savings horizon is 1-3 years. The compounding effect over that period is a few percent of the final balance, small enough that ignoring it keeps the projection conservative without distorting the timeline.
What other costs come on top of the deposit?
Settlement costs (legal $1,500-$2,500, registered valuation $700-$1,200 if the bank requires one, building inspection $500-$900, LIM report $200-$400) typically add $3,000-$5,000 on top of the deposit. Stamp duty does not exist in NZ; there is no purchase tax for an owner-occupier.
Can family help with the deposit?
Yes. Most NZ banks accept a "gift" letter from family for part or all of a deposit, with the gift formally documented and the donor confirming no expectation of repayment. Some banks accept a family-guarantor structure where the family member uses their own equity to top up the buyer’s deposit, although that exposes the guarantor to the loan.
Should I buy with 10% and pay the low-equity margin, or wait until I have 20%?
The calculator does not advise either way. The trade-off is paying a higher rate for as long as your LVR stays above 80%, against the risk that house prices rise faster than your savings during the wait. The trade-off is highly individual and worth running by an independent mortgage adviser.
References & sources
- Inland Revenue, "Buying my first home (KiwiSaver First Home Withdrawal)". ird.govt.nz
- Kāinga Ora, "First Home Grant scheme (closed)". kaingaora.govt.nz
- Reserve Bank of New Zealand, "LVR restrictions". rbnz.govt.nz
- REINZ, "Monthly property report and HPI". reinz.co.nz