Mortgage calculator

What could your deposit support?

Allow for buying costs and a cash buffer, then explore your purchase budget.

Your deposit and purchase budget

This tool separates money available for a deposit from buying costs and a cash buffer. The deposit percentage is your planning assumption, not a lender requirement.

Example and common question

Illustrative example: With $120,000 available, $5,000 of costs and a $10,000 buffer, $105,000 remains for a deposit. At 20%, that supports a $525,000 purchase with a $420,000 loan, subject to approval.

Is this my approved buying budget?

No. Income, expenses, debts, the property and lender criteria also determine what you can borrow. KiwiSaver and gifted funds need to be confirmed.

Your deposit

Only include funds you expect to have available for the purchase.

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Confirm eligibility and the available amount with your provider.

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Your chosen planning assumption, not a lender’s approval rule.

Your purchase plan

A deposit budget is only one part of the picture.

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Optional. Zero means no borrowing limit supplied, not unlimited borrowing.

Example figures only. Replace them with your own numbers.

Deposit-based purchase budget

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Total deposit funds—
Deposit after costs and cash buffer—
Borrowing needed at this budget—
Deposit percentage at this budget—
Borrowing needed for your target price—
Extra deposit needed for your target—
Shortfall for costs and cash buffer—

Your borrowing still needs checking

Income, expenses, other debts and the property all affect approval. Borrowed deposit funds must be assessed as debt.

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How this estimate works

Available deposit = savings + eligible KiwiSaver withdrawal + confirmed gift / other funds, less buying costs and the cash buffer. Budget = available deposit divided by your deposit target percentage. If a confirmed borrowing limit is entered, the budget is capped at that limit plus your available deposit.

This does not estimate borrowing power or assess lender policy. The deposit target is chosen by you, not a guaranteed minimum. Low-equity premiums, insurance, ongoing ownership costs and lender conditions are not automatically calculated. Include known upfront costs in buying costs.

KiwiSaver withdrawals and gifts need to be eligible and confirmed. Only enter the amount actually available. The extra-deposit figure is the gap against your chosen deposit percentage; a borrowing-limit shortfall is shown separately when relevant.

Estimates only. Not personalised financial advice or lending approval. Your lender's calculation and eligibility criteria may differ. Our disclosure statement.