Introduction
This home loan repayment calculator shows what your mortgage will cost. Type in your loan amount, interest rate, and loan term. You will see your repayment right away — weekly, fortnightly, or monthly.
You can also test different choices. Add extra repayments, an offset account, or a lump sum, and see how much interest you save and how much sooner your loan ends. Pick principal and interest or interest only, and choose an owner-occupied or investment loan. If you have a split loan with a blended rate, you can enter a fixed portion and a variable portion too.
The results include a chart of your loan balance over time, a full year-by-year table, and a "what if rates change" tool that shows how a rate rise or cut would change your repayment. There is also an affordability meter that compares your repayment to your income, plus a step-by-step section that shows the math behind every number.
All amounts are estimates to help you plan. Your real repayment may differ once fees, rate changes, and lender rules are added. For a broader view of a purchase, try our mortgage calculator, home affordability calculator and stamp duty calculator.
How to use our CBA Home Loan Repayment Calculator
Enter your loan amount, term, interest rate and repayment choices. The calculator shows your repayment, total interest, total repayments, your loan end date and a full year-by-year schedule.
Loan amount: Type how much you want to borrow, or drag the slider. This is the price of the home minus your deposit. Not sure how much to put down? Use the down payment calculator.
Loan term: Enter how many years you want to pay the loan off, up to 30 years. A longer term means smaller repayments but more interest. Compare a 30-year loan with a 15-year loan to see the difference.
Annual interest rate: Enter the rate your lender charges each year, like 6.14%. Our mortgage rate calculator can help you test different rates.
Comparison rate: Enter the rate that includes most fees, if you know it. Leave it blank to hide it. The APR calculator works on a similar idea.
Loan purpose: Pick Owner-occupied if you will live in the home, or Investment if you will rent it out. Investors can also check the rental yield calculator and investment property calculator.
Repayment type: Pick Principal & interest to pay down the loan, or Interest only to pay just the interest for a while. See the interest only mortgage calculator for a deeper look.
Interest only period: If you chose Interest only, pick how many years it lasts. The calculator then shows the higher repayment that starts after it ends.
Repayment frequency: Choose Monthly, Fortnightly or Weekly to match your pay cycle. The biweekly mortgage calculator shows the payoff effect of more frequent payments.
Extra repayment: Enter any extra money you can pay each period. The calculator shows the interest you save and how much sooner you finish — the mortgage extra payment calculator and early mortgage payoff calculator explore this further.
Average offset balance: Enter the usual amount you keep in your offset account. This money cuts the interest you are charged.
Lump sum amount: Enter a one-off payment you plan to make, such as a bonus or tax refund. A mortgage recast calculator shows another way lenders handle big one-off payments.
Paid after: Enter how many years from now you will make that lump sum payment.
Split loan switch: Turn this on if part of your loan is fixed and part is variable.
Fixed rate portion: Enter the dollar amount on the fixed rate. The rest is treated as variable.
Fixed rate, fixed period and variable rate: Enter the fixed rate, how many years it is locked in, and the variable rate that applies after.
Interest rate change buttons: Tap a rate move, like +0.50%, to see how much your repayment would go up or down.
Graph view and Table view: Switch between the balance chart and the year-by-year table of principal, interest and closing balance. For a payment-by-payment breakdown, see the mortgage amortization calculator.
Gross monthly income: Pick your income before tax. The meter shows what share of your income the repayment takes. Check your debt-to-income ratio too.
Calculate, Reset and Print summary: Press Calculate to update the results, Reset to start again, or Print summary to save a copy.
Home Loan Repayments Explained
A home loan repayment is the set amount you pay your lender each week, fortnight or month. Every payment is split into two parts: principal (the money you borrowed) and interest (the fee the bank charges you to borrow it). Early on, most of your payment goes to interest. Later, more of it goes to principal, and your balance drops faster. The amortization calculator shows this split in detail.
What Changes Your Repayment Amount
- Loan amount: A bigger loan means a bigger repayment.
- Interest rate: Even a 0.25% move can change your payment by a lot over 30 years. Test rates with the loan interest rate calculator.
- Loan term: A longer term lowers each payment but costs more interest in total.
- Repayment type: Principal and interest pays the loan off. Interest only does not.
Principal and Interest vs Interest Only
With principal and interest (P&I), your balance shrinks with every payment, so the loan ends on time. With interest only (IO), you pay just the interest for a set period, usually 1 to 5 years. Your payments are smaller, but the balance stays the same. When the IO period ends, payments jump, because you must repay the whole loan in less time. Investors often use IO loans for tax and cash flow reasons — the interest only calculator models this pattern.
Owner-Occupied vs Investment Loans
An owner-occupied loan is for the home you live in. An investment loan is for a property you rent out. Lenders in Australia usually charge a higher rate on investment loans because they see them as riskier. If you are weighing up buying at all, the rent vs buy calculator and rental property calculator are useful next steps.
Repayment Frequency
You can pay monthly, fortnightly or weekly. Splitting your payment into smaller, more frequent chunks can help you match your pay cycle. If you pay half a monthly amount every fortnight, you end up making the equal of 13 monthly payments a year instead of 12, which pays the loan off sooner. Line this up with your biweekly paycheck or weekly pay.
Ways to Pay Less Interest
- Extra repayments: Any money above your set payment goes straight to the principal, so you pay less interest and finish early. See the extra payment calculator.
- Offset account: Money in this account is subtracted from your loan balance before interest is worked out. Keep $20,000 in offset on a $450,000 loan and you only pay interest on $430,000.
- Lump sum: A one-off payment, such as a bonus or tax refund, cuts the balance right away and saves years of interest. The mortgage payoff calculator shows the new end date.
Comparison Rate
The interest rate alone does not show the full cost. A comparison rate rolls the interest rate plus most standard fees into one number, so you can compare loans fairly. Always check both, and put two offers side by side with the loan comparison calculator or the mortgage comparison calculator.
How Much Can You Afford?
A common guide is to keep home loan repayments under 28% of your gross monthly income. Between 28% and 35% is tight. Above 35% is called mortgage stress, and leaves little room if rates rise or your income drops. Because most Australian home loans are variable rate, it is smart to check what your payment would look like if rates went up by 1% or 2%. Work out your take-home figure first with the PAYE calculator or monthly income calculator, then set a plan using the budget calculator.
Split Loans
A split loan puts part of your debt on a fixed rate and part on a variable rate. The fixed part keeps your payment steady for a set number of years. The variable part lets you make extra repayments and use an offset account. It is a middle path between safety and freedom. Also consider your loan-to-value ratio, since it affects the rate you are offered and whether lenders mortgage insurance applies. Later on, a refinance mortgage calculator can tell you if switching is worth it, and the home equity calculator tracks the wealth you build along the way.
These figures are estimates only. Your lender's actual rate, fees and approval terms may differ.