Australia Mortgage Calculator
Calculate your Australian home loan repayments across monthly, fortnightly, or weekly schedules, with Loan to Value (LVR) thresholds and Lenders Mortgage Insurance (LMI).
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How Australian home loans work
In Australia, home loans (mortgages) are predominantly offered by major retail banks and non-bank lenders on standard 25 to 30 year terms. Australian borrowers frequently structure loans with flexible repayment frequencies, including monthly, fortnightly, or weekly schedules to align directly with their employer pay cycles.
When purchasing residential real estate in Australia with a deposit of less than 20% (meaning a Loan-to-Value Ratio / LVR greater than 80%), lenders require borrowers to pay Lenders Mortgage Insurance (LMI). LMI protects the lending institution against financial loss if the borrower defaults and the property is sold for less than the outstanding loan balance.
Australian loans can be structured as Principal and Interest (P&I) or Interest-Only (IO), commonly used by property investors for up to 5 years. In addition, many Australian home loans feature an offset account or redraw facility, allowing borrowers to park everyday savings against the loan principal to instantly reduce daily interest calculations.
This Australian mortgage calculator accurately computes your repayments based on RBA-aligned market interest rates, loan terms, and LVR brackets. Enter your purchase price, deposit, and repayment frequency above to project your exact regular commitments and lifetime interest.
The Australian home loan repayment formula
Standard Australian Principal and Interest repayments are calculated using standard level amortization formulas:
| Symbol | Meaning |
|---|---|
P |
Net loan amount ($560,000 on a $700,000 property with $140,000 deposit) |
i |
Periodic interest rate (quoted annual rate divided by 12 for monthly, 26 for fortnightly) |
n |
Total scheduled repayment periods (360 monthly periods for a 30-year term) |
LVR |
Loan to Value Ratio ($560k ÷ $700k = 80.0%, waiving LMI charges) |
For interest-only loans, repayments equal P × i. Fortnightly repayments equal monthly payment × 12 ÷ 26.
Worked Australian mortgage payment example
A $700,000 Australian residential property with a $140,000 deposit (80% LVR / $560,000 loan) at a 6.20% interest rate on a 30-year Principal & Interest schedule produces the following breakdown:
| Home Loan Component | Amount (AUD $) |
|---|---|
| Scheduled monthly repayment | $3,429.83 |
| Net loan amount borrowed | $560,000.00 |
| Lenders Mortgage Insurance (LMI at 80% LVR) | $0.00 |
| Total interest payable over 30 years | $674,737.46 |
| Total loan repayments over 30 years | $1,234,737.46 |
Because the deposit equaled exactly 20% ($140,000), the LVR did not exceed 80%, completely eliminating Lenders Mortgage Insurance fees and saving thousands in upfront charges.
Estimates only. Your lender's figures may differ because of fees, escrow and rounding.
Tips for Australian home loan borrowers
Link a 100% mortgage offset account
An offset account is an everyday transaction account linked to your mortgage. Every dollar sitting in this account offsets the loan principal on which daily interest is calculated, saving tens of thousands over the life of the loan.
Switch to fortnightly payments to accelerate payoff
Paying your home loan fortnightly aligns payments with typical Australian salary schedules. Making 26 fortnightly payments per year subtly pays down principal faster and reduces lifetime interest charges.
Avoid LMI with an 80% LVR deposit or guarantee
Lenders Mortgage Insurance can cost $10,000 to $25,000 on an average Australian property. Maintaining an 80% LVR through savings or utilizing an eligible family guarantor structure avoids this fee entirely.
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Frequently asked questions
What is Lenders Mortgage Insurance (LMI) in Australia?
Lenders Mortgage Insurance is a one-off premium charged by Australian lenders when you borrow more than 80% of a property's purchase value (LVR over 80%). It protects the lender in the event of borrower default.
How does a mortgage offset account work in Australia?
An offset account is a linked transaction deposit account where your balance is subtracted from your home loan principal before daily interest is calculated, substantially reducing interest charges while keeping cash accessible.
Can I make weekly or fortnightly repayments on an Australian home loan?
Yes. Most Australian banks and lenders allow borrowers to choose between monthly, fortnightly, or weekly repayment schedules. Paying fortnightly can help align with wage deposits and clear the debt faster.
What is the difference between Principal & Interest and Interest-Only in Australia?
Principal and Interest repayments reduce your loan balance with every payment until it reaches zero. Interest-Only repayments cover only the interest charges for an agreed initial period, after which payments increase to clear the principal.