How Long to Save a House Deposit in New Zealand

Summary

This calculator estimates how long it takes to save a mortgage deposit in New Zealand. With a median house price around NZ$770,000 and RBNZ LVR restrictions requiring at least 20% deposit for most owner-occupiers, the typical deposit target is NZ$154,000. Government support through KiwiSaver withdrawal and the First Home Grant can significantly shorten the timeline.

How it works

Deposit requirements

The RBNZ’s LVR speed limits set the effective deposit minimums:

Only 15% of new owner-occupier lending can exceed 80% LVR, so banks are selective about whom they approve at <20% deposit.

Monthly simulation

The calculator projects month by month:

1. Current balance earns interest: balance x (1 + monthly rate)
2. Monthly contribution added: balance + contribution
3. Repeat until balance reaches the target deposit

Government assistance for first-home buyers

KiwiSaver first-home withdrawal: After 3 years of membership, withdraw your full KiwiSaver balance (minus NZ$1,000) towards a first home. This can add NZ$20,000-NZ$60,000+ to your deposit depending on your balance.

First Home Grant (Kainga Ora):

• NZ$5,000 per person for existing homes (3+ years in KiwiSaver)
• NZ$10,000 per person for new builds (5+ years in KiwiSaver)
• Income cap: NZ$95,000 (single) or NZ$150,000 (combined)
• House price caps vary by region (e.g., NZ$875,000 in Auckland, NZ$550,000 in some regional areas)

First Home Loan: Kainga Ora underwrites 95% LTV mortgages for eligible buyers, bringing the minimum deposit to just 5%.

Worked example

NZ$770,000 property, 20% deposit target, NZ$20,000 current savings, NZ$1,500/month contributions, 4.12% savings rate:

1. Target deposit: NZ$770,000 x 20% = NZ$154,000
2. Gap to fill: NZ$154,000 - NZ$20,000 = NZ$134,000
3. Monthly rate: 4.12% / 12 = 0.3433%
4. Month-by-month simulation reaches NZ$154,000 at approximately month 73 (6 years 1 month)
5. Total contributions by then: NZ$20,000 + (NZ$1,500 x 73) = NZ$129,500
6. Interest earned: NZ$154,000 - NZ$129,500 = approximately NZ$24,500

With KiwiSaver withdrawal (NZ$40,000) and First Home Grant (NZ$5,000):

• Effective target from savings: NZ$154,000 - NZ$45,000 = NZ$109,000
• Timeline drops to approximately month 49 (4 years 1 month) — saving 2 years

Key differences from other markets

• RBNZ-mandated 20% deposit for most borrowers is stricter than the UK (where 5% deposits are available via the Mortgage Guarantee Scheme) or Australia (where lenders mortgage insurance enables 5-10% deposits).
• KiwiSaver first-home withdrawal + First Home Grant creates a combined government-supported pathway that is more generous than the UK LISA for many savers, particularly couples who can combine grants totalling up to NZ$20,000 for a new build.