Reverse Mortgage Calculator
Model a Heartland-style reverse mortgage. See max LVR by age, compounding debt over time, and estate equity remaining after years of drawdown.
About this calculator
This calculator implements Heartland reverse mortgage LVR + interest rate schedule from Heartland Bank NZ. Last consulted 18 May 2026. Verify the figures yourself by following the link.
Heartland Reverse Mortgage parameters
Mid-2026 indicative- •Interest rate: ~9.25% p.a. variable
- •Compounding: Monthly (no regular repayments)
- •Max LVR at age 60: 20%
- •Max LVR at age 70: 30%
- •Max LVR at age 80: 45%
- •Min property value: $200,000
- •No Negative Equity Guarantee: Yes — debt can't exceed home
Source: Heartland Bank NZ
Disclaimer
This calculator provides estimates for general information purposes only. Results should not be relied upon as professional financial, tax, or legal advice. Tax rates and thresholds are based on publicly available IRD data and may change. Always consult a qualified tax agent or financial adviser for advice specific to your circumstances.
How a Heartland reverse mortgage compounds
Borrow against home equity. No regular payments — interest compounds monthly. Repaid on sale/death.
- 1
Max borrowing by age
Max_borrow = home_value × LVR(age)
LVR: 60yo 20%, 70yo 30%, 80yo 45%.
- 2
Compounding balance
Balance(t) = (Balance(t-1) + monthly_drawdown) × (1 + r ÷ 12)
r ≈ 9.25% p.a. variable.
- 3
Future home value
Home(t) = Home_0 × (1 + growth_rate)^t
Assume 3-4% long-term NZ growth.
- 4
Estate equity
Equity = max(0, Home(t) − Balance(t))
NNG: debt can never exceed home value.
Worked example
Inputs: $900k home, age 70, $50k lump + $1,200/mo for 15yr, 3.5% growth
Result: Max borrow $270k. After 15yr: debt $510k, home $1.51M, equity ~$998k.
Frequently Asked Questions
How does a reverse mortgage work in NZ?
Is a reverse mortgage a good idea?
How does a NZ reverse mortgage affect my will and inheritance?
Are there alternatives to a reverse mortgage in NZ?
How this calculator works
This reverse mortgage calculator uses the latest data from official New Zealand government sources to provide accurate results. All calculations are performed in your browser — your data never leaves your device.
All calculations are performed in your browser — your data never leaves your device. Results are for general guidance only and should not be considered professional financial advice.
Built and maintained by Konstantin Iakovlev. Data sourced from the IRD and official New Zealand government sources.
Last reviewed: