20% Deposit NZ — Do You Really Need 20% to Buy a House?

The 20% deposit has become the default expectation for buying a home in New Zealand. But where does this number come from, why do banks require it, and what are your options if you don’t have 20%?

Why Banks Require a 20% Deposit

The Reserve Bank of New Zealand (RBNZ) sets Loan-to-Value Ratio (LVR) restrictions that limit how many high-LVR loans banks can write. An 80% LVR mortgage (20% deposit) is the standard level below which banks can lend without restriction.

The bank’s perspective:

At 80% LVR, the property can fall 20% in value before the bank is in a negative equity position
Historically, NZ property values have rarely sustained falls of more than 15–20% from peak to trough — a 20% deposit provides adequate buffer
Borrowers with more equity at stake have stronger incentive to maintain repayments

Since July 2024: DTI (Debt-to-Income) limits of 6× also apply. Your maximum mortgage is limited to 6 times your gross annual income, regardless of deposit size. This is an additional constraint that affects large-deposit borrowers too.

How Much Is 20% by Price

Purchase price	20% deposit required
$500,000	$100,000
$600,000	$120,000
$700,000	$140,000
$800,000	$160,000
$900,000	$180,000
$1,000,000	$200,000
$1,200,000	$240,000

Plus buying costs (legal fees, building inspection, LIM) — budget an additional $8,000–$15,000 above your deposit.

How Long to Save 20%

Monthly savings	Time to save $140,000 (20% on $700k)
$2,000	70 months (5 years 10 months)
$3,000	47 months (3 years 11 months)
$4,000	35 months (2 years 11 months)
$5,000	28 months (2 years 4 months)

With KiwiSaver (assuming $30,000 available):

Monthly savings	Time to save $140,000 (with $30k KiwiSaver)
$2,000	55 months (4 years 7 months)
$3,000	37 months (3 years 1 month)
$4,000	28 months (2 years 4 months)

What Happens If You Have Less Than 20%?

Having less than 20% doesn’t automatically mean you can’t buy — but your options are more limited:

Option 1: First Home Loan (Kāinga Ora) Eligible first home buyers can purchase with just 5% deposit through the Kāinga Ora First Home Loan. Income caps ($95k single / $150k combined) and property price caps apply. See First Home Loan NZ.

Option 2: New build (10% deposit) New build properties are exempt from standard LVR rules — owner-occupiers can borrow up to 90% LVR (10% deposit). See New Build LVR NZ.

Option 3: Guarantor mortgage A parent or close family member with equity in their own home guarantees part of your deposit. Allows purchase with less than 20% without rate loading. See Guarantor Mortgage NZ.

Option 4: Low equity loan (10–19% deposit) Banks maintain a small volume of high-LVR loans (10–19% deposit). These typically carry a low equity premium — a rate loading of 0.25–0.75% above the standard rate. Availability is limited.

20% Deposit vs Other Options: Summary

Option	Minimum deposit	Rate premium?	Restrictions
Standard owner-occupier	20%	None	None
New build owner-occupier	10%	None	Must be a new build
First Home Loan	5%	None	Income + price caps
Low equity loan	10–19%	Yes (0.25–0.75%)	Limited volume
Guarantor mortgage	As low as 5%	Typically none	Guarantor required

Does Having More Than 20% Help?

Beyond the 20% threshold, additional deposit does not typically reduce your interest rate in NZ (unlike some markets where rates tier at 50%, 60%, etc.). The primary benefit of a larger deposit is:

Lower mortgage amount — less debt, lower repayments, less interest over the life of the loan
More flexibility — a lower LVR gives you more room if property values fall
Better negotiating position — very strong borrowers can negotiate harder on rates

Sources of the 20% Deposit

For first home buyers, the deposit commonly comes from:

Savings — the most common source
KiwiSaver — withdrawable after 3 years membership (full balance minus $1,000)
Gifted deposit — parents or family gifting funds. Banks require a deed of gift confirming it’s not a loan. See Gifted Deposit NZ.
Family guarantee — using family home equity rather than cash