Calculate maximum borrowing power under official Reserve Bank of New Zealand DTI limits (6x owner, 7x investor) and LVR deposit restrictions with bank stress testing.
Deposit / LVR is binding constraint
Loan plus cash deposit
6x gross income cap
%80 max LVR allowed
Household income, cash deposit, and existing liabilities.
Assessment against statutory DTI and LVR caps.
\text{Max Total Debt (DTI)} = \text{Gross Household Income} \times \text{DTI Multiple} \\
\begin{cases}
6.0\times & \text{for Owner-Occupiers} \\
7.0\times & \text{for Property Investors}
\end{cases} \\
\\
\text{Max New Mortgage (DTI)} = \text{Max Total Debt} - \text{Existing Debts} \\
\\
\text{Max Borrowing (LVR)} = \text{Deposit} \times \frac{\text{Max LVR}}{1 - \text{Max LVR}} \\
\\
\text{Actual Borrowing Power} = \min(\text{Max Borrowing}_{DTI}, \text{Max Borrowing}_{LVR})The Reserve Bank of New Zealand (RBNZ) enforces macroprudential limits on mortgage lending: Debt-to-Income (DTI) caps total household debt to 6x gross income for owner-occupiers and 7x for investors. Loan-to-Value Ratio (LVR) requires a minimum 20% deposit for owner-occupiers (80% LVR) and 30% for investors (70% LVR). A borrower's true borrowing ceiling is governed by whichever constraint is most restrictive.
All calculations, amortizations, and scenario projections displayed on this page are strictly for informational and educational purposes. Nothing herein constitutes investment, financial, tax, or legal advice. Actual Reserve Bank of New Zealand (RBNZ) interest rates, IRD PAYE brackets, ACC Earner's Levy, KiwiSaver regulations, and lender criteria may vary. Calconova explicitly disclaims all liability for any decisions taken based upon these calculations. Consult a qualified financial advisor, CPA, or official Inland Revenue documentation prior to executing financial commitments.
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