Principal vs interest
Lifetime mortgage repayment
Principal$0
Interest$0
Australia · AUD
Australian mortgage calculator.
Estimate home loan repayments, ownership costs and the effect of extra payments in Australian dollars.
Balance over time
How your remaining principal declines
Amortization schedule
Annual summary including extra payments
| Year | Principal | Interest | Extra payments | Total paid | Ending balance |
|---|
Compare deposit and mortgage term
See how monthly payments and total interest change across different deposits and terms.
| Deposit | 15 years | 20 years | 25 years | 30 years |
|---|---|---|---|---|
| 10% | $6,076per month$373,638 interest | $5,158per month$517,993 interest | $4,639per month$671,691 interest | $4,317per month$834,035 interest |
| 15% | $5,738per month$352,881 interest | $4,872per month$489,215 interest | $4,381per month$634,375 interest | $4,077per month$787,700 interest |
| 20% | $5,401per month$332,123 interest | $4,585per month$460,438 interest | $4,124per month$597,059 interest | $3,837per month$741,364 interest |
| 25% | $5,063per month$311,365 interest | $4,299per month$431,661 interest | $3,866per month$559,743 interest | $3,597per month$695,029 interest |
6.00% interest rate · $800,000 property price
Interest-rate stress test
See how your payment and total interest could change if the mortgage rate rises.
0%+2.5%+5%
Stressed rate9.00%
Stressed monthly payment$5,150
Monthly difference+$1,312
Additional total interest+$472,486
This scenario holds the stressed rate constant for comparison. Actual variable, renewal, and lender rates may differ.
Save with extra payments
Add a monthly or yearly amount and see how much you could save over the full mortgage.
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$
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Total interest saved$0
Time savedNo change
New payoff date—
Balance comparison
Standard paymentsWith extra payments
Australian planning estimate only. Lender rates, serviceability methods, LMI, transfer duty, grants, concessions, council rates, strata levies and insurance vary by lender, state or territory, borrower and property.
Australian home-loan guide
Estimate your Australian home loan repayments
An Australian mortgage calculator helps you estimate principal-and-interest repayments from the property price, deposit, interest rate and loan term. This calculator works in Australian dollars and lets you compare monthly, fortnightly and weekly repayment frequencies, ongoing ownership costs, extra repayments and a higher-rate stress scenario.
Use the result as a planning estimate rather than a lending decision. Australian lenders assess verified income, living expenses, debts, credit history, deposit, property valuation and their own serviceability policies before approving a home loan.
What costs should an Australian mortgage calculator include?
The scheduled home loan repayment covers principal and interest. A realistic household budget should also allow for council and water rates, building insurance, strata or body corporate levies where applicable, maintenance and possible lenders mortgage insurance. These expenses do not all go to the lender, but they affect the ongoing cost of owning the property.
Buying costs are separate from repayments. Transfer duty—often called stamp duty—is administered by each state or territory, and first-home buyer concessions differ by location and eligibility. Conveyancing, inspections, registration and loan fees may also require cash at settlement.
Property price and deposit
The base loan is the purchase price minus the deposit. A 20% deposit produces an 80% loan-to-value ratio. Borrowing above 80% LVR often involves lenders mortgage insurance, although lender policies and government guarantee schemes can change the outcome.
Interest rate and loan term
The rate and term determine the scheduled principal-and-interest repayment. A longer term generally lowers each repayment but can increase total interest. Variable rates can change, while fixed rates apply for an agreed fixed period rather than necessarily the full loan term.
Monthly, fortnightly or weekly
Australian borrowers commonly choose monthly, fortnightly or weekly repayments. Compare like-for-like annual repayment totals: paying half a monthly amount every fortnight can create the equivalent of an extra monthly repayment each year, while simply dividing the annual amount by 26 does not.
Council rates, insurance and strata
Enter annual council and water rates, annual building insurance and monthly strata or body corporate levies. Actual amounts depend on the council, property, insurer and owners corporation, so local figures are more useful than national averages.
What is the APRA mortgage serviceability buffer?
APRA requires regulated banks to assess new residential borrowers using an interest-rate buffer of at least 3 percentage points above the loan rate, unless APRA determines otherwise. The buffer is an assessment tool, not the rate charged on the loan. Use the stress test to see how repayments change at a higher rate, but remember that each lender also applies its own income, expense and credit policies.
LVR and lenders mortgage insurance in Australia
Loan-to-value ratio compares the loan with the lender’s accepted property value. LMI commonly applies when borrowing exceeds 80% of the property value. It protects the lender rather than the borrower and is often a one-off cost that may be paid upfront or added to the loan, subject to lender rules. A low-deposit government scheme may allow an eligible buyer to avoid LMI, but eligibility and place limits apply.
Stamp duty and first-home buyer concessions
Transfer duty is state or territory based, so there is no single Australian stamp-duty percentage suitable for every purchase. The amount can depend on price, location, property type, residency, intended use and first-home buyer status. Use the calculator for loan repayments, then obtain a current duty estimate from the relevant state or territory revenue office.
How extra repayments and lump sums affect a home loan
Extra repayments reduce principal earlier and can lower future interest and shorten the loan term. The overpayment comparison lets you test a recurring monthly or annual amount and a one-off lump sum. Confirm whether the loan limits extra repayments during a fixed-rate period and whether redraw access, fees or conditions apply.
Repayment estimate versus borrowing capacity
This calculator estimates the repayment for a chosen loan. Borrowing capacity is different: a lender tests income, existing commitments, living expenses and repayment capacity at a buffered rate. Keep an emergency reserve and allow for buying costs instead of treating the entire savings balance as the deposit.
Australian mortgage calculator questions
How are Australian mortgage repayments calculated?
For a principal-and-interest loan, repayments are calculated from the loan balance, interest rate, repayment frequency and remaining term so the balance reaches zero at the end of the schedule, assuming the rate and payments do not change.
Do fortnightly repayments pay off a mortgage faster?
They can if the fortnightly amount equals half the monthly repayment, because 26 half-payments equal 13 monthly payments each year. A lender may instead calculate an equivalent fortnightly amount that produces the same annual total, so check the actual repayment method.
When is lenders mortgage insurance required?
LMI is commonly charged when the loan exceeds 80% of the lender-assessed property value, but thresholds, premiums and exemptions vary. It protects the lender, not the borrower.
Does this calculator include stamp duty?
No single estimate is applied because transfer-duty rules and concessions differ across Australian states and territories. Check the relevant government revenue calculator for the property location.
Why might a lender calculate a different repayment?
The lender may use a different interest rate, compounding convention, repayment date, fee treatment or property valuation. Approval also depends on serviceability and credit assessment, which this repayment calculator does not reproduce.