NZ Mortgage Borrowing Power Calculator
Estimate New Zealand mortgage borrowing power using after-tax income, living costs, debt payments, a test interest rate, and RBNZ DTI thresholds.
Regional Rule Context
New Zealand Rates and Rules
Uses owner-occupier 6x and investor 7x gross income DTI thresholds as a planning comparison, alongside a monthly affordability estimate. These are bank speed-limit thresholds, not automatic individual approval limits.
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Result
Enter values above and click Calculate to see your result.
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This is an affordability estimate only. New Zealand lenders must make their own suitability and affordability assessments and may use different buffers, expense benchmarks, credit policies, and approval criteria.
Disclaimer: This calculator uses publicly available rules effective as of Apr 18, 2026 (version 1.0). Results are for informational purposes only. Always verify with official sources or a qualified professional. Last reviewed: Apr 18, 2026.
Formula
The serviceable loan is calculated from the monthly mortgage payment your budget can support at an assessed interest rate. The DTI threshold loan compares total debt with annual gross income using current New Zealand DTI threshold settings.
New Zealand FAQs
Is this bank approval?
No. It estimates a possible borrowing range for planning. A lender or broker must assess your full application.
What DTI threshold is used?
The calculator uses 6x gross income for owner-occupiers and 7x gross income for investors as high-DTI threshold comparisons.
Why include existing debt balance?
DTI compares total debt with gross income, so other debts reduce the loan amount available before crossing the selected threshold.
Why include living costs?
Responsible lending assessments consider whether repayments are affordable after normal living costs and existing commitments.
How can I put this NZ Mortgage Borrowing Power Calculator on my blog or website?
Yes, the NZ Mortgage Borrowing Power Calculator is fully embeddable. Tap "Embed" above to configure appearance and copy the code. It is free to use, works on any platform (HTML, WordPress, CMS), and adjusts to any screen size automatically. Visit calculory.com/services/embed-calculators for the complete guide.
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