Deposit at Risk Calculator NZ
Almost everyone who signs an unconditional agreement believes the worst case is losing the deposit. It is an understandable belief, because the deposit is the only number anyone mentions, and it is wrong in a way that has ended people financially. The purpose of a damages claim is to put the vendor where they would have been if you had settled, not to fine you a fixed amount, so the deposit is credited against a loss rather than being the loss. Where the market has moved against them and the property resells for less, where they have paid a second commission and run a second campaign, and where default interest has accrued for months, the total can comfortably exceed what you handed over. This page exists to put that number in front of people while they still have the option of not signing.
What the vendor has lost
Where the exposure comes from
| Component | Amount | Share of the loss |
|---|---|---|
| Shortfall on the resale | $40,000.00 | 38.3% |
| Cost of selling again | $35,000.00 | 33.6% |
| Default interest | $21,304.11 | 20.4% |
| Holding costs | $8,000.00 | 7.7% |
| Total | $104,304.11 | 100.0% |
The resale shortfall is the largest single component, and it is the one you have no control over. It is set by the market between the day you signed and the day the vendor resells.
How the market changes the answer
| If the resale achieves | Vendor's total loss | Beyond the deposit |
|---|---|---|
| $720,000.00 | $144,304.11 | $64,304.11 |
| $760,000.00 | $104,304.11 | $24,304.11 |
| $800,000.00 | $64,304.11 | $0.00 |
| $840,000.00 | $64,304.11 | $0.00 |
Even a resale at the price you agreed to pay leaves the vendor out of pocket, because the costs of selling twice and the interest do not disappear. A falling market is what turns a bad situation into a ruinous one.
The deposit is credited, not capped
The mental model to replace is the one where the deposit is a fee for walking away. It is not. A claim for breach of contract aims to put the vendor in the position they would have occupied had the contract been performed, and the deposit they hold is simply credited against that figure. If the loss is smaller than the deposit, the arithmetic works in your favour. If it is larger, the excess is a debt. Nothing about paying a deposit purchases an option to withdraw, and agreements are not usually drafted to suggest otherwise, which is why the belief survives mainly because it is never tested.
The market does the damage, and you cannot influence it
Of the four components in this calculation, three are broadly predictable. A second commission costs what a commission costs, holding costs accrue at a knowable rate, and default interest is arithmetic. The resale shortfall is different: it is whatever the gap turns out to be between the price you agreed and the price the market pays some months later, and it can be nothing or it can be the largest number on the page. That is why the exposure is genuinely uncertain rather than merely unknown, and why the sensible response is to reduce the chance of being in this position rather than to estimate it precisely.
Almost all of these are avoidable
Failed settlements do not usually happen because someone changed their mind. They happen because a purchaser went unconditional on the strength of something that had not been confirmed: a pre-approval that had never seen the property, a valuation that had not been done, a sale of their own house that had not gone unconditional, or family money that had been promised rather than transferred. Every one of those is checkable in advance for a few hundred dollars and a few days. Against an exposure of this size that is not a close call.
Worked example
A purchaser cannot settle an $800,000.00 purchase on which they have paid an $80,000.00 deposit. The vendor cancels and resells for $760,000.00, a shortfall of $40,000.00.
Selling a second time costs the vendor $35,000.00 in commission, marketing and legal fees, and they incur $8,000.00 of holding costs while the property is back on the market. Default interest at 12.00% on the unpaid balance of $720,000.00 for the 90 days until the resale adds $21,304.11.
The vendor's total loss is $104,304.11. The deposit covers $80,000.00 of it, leaving $24,304.11 that can still be claimed. The purchaser's total exposure is 1.3 times what they thought was at stake.
How this is calculated
The resale shortfall is the agreed purchase price less what the property resells for, floored at zero since a resale above your price produces no shortfall. Default interest is the unpaid balance, being the price less the deposit paid, multiplied by the annual default rate and by the days until resale divided by 365. The vendor's total loss is the shortfall plus their costs of reselling plus their holding costs plus that interest. The amount recoverable beyond the deposit is the total loss less the deposit, floored at zero. Total exposure is the deposit plus anything beyond it, which equals the vendor's loss whenever that loss exceeds the deposit, and equals the deposit otherwise.
Official sources
- Contract and Commercial Law Act 2017, legislation.govt.nz
- Buying and selling property, New Zealand Law Society
- Buying a property, Real Estate Authority
- Buying a home, settled.govt.nz
Related NZ calculators
- Unconditional Offer Risk Calculator for pricing the risk before you take it
- Auction Day Cash Required Calculator where every bid is unconditional
- Late Settlement Interest Calculator for a delay rather than a failure
- Settlement Funds Shortfall Calculator for checking you can settle before the day
- Mortgage Pre-Approval Expiry Calculator for whether your finance is actually current
- Risk vs Uncertainty, related background.
Related calculators
- Downsizing Net Gain Calculator NZ: Cash Freed Up by Selling Smaller.
- Early Possession and Rent-Back Calculator NZ: What Occupation Should Cost.
- House Closing Costs Calculator NZ: Settlement Costs to Buy.
- House Selling Timeline Calculator NZ 2026: project listing, offer, unconditional and settlement dates, and what e.
How to work out your exposure if you cannot settle a New Zealand house purchase
- Enter the price and the deposit paid. The deposit is what you lose first. It is rarely what you lose in total.
- Estimate what the vendor would get on a resale. A resale after a failed settlement often achieves less, because the property is back on the market and the circumstances are known.
- Add the vendor's costs of selling again. A second commission, a second marketing campaign and further legal fees, none of which they would have paid if you had settled.
- Add their holding costs and the default interest. Interest runs on the unpaid balance from the settlement date until the matter is resolved.
- Read the exposure beyond the deposit. The result shows the vendor's total loss, how much the deposit covers, and what can be pursued on top.