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Offset Account Calculator

Calculate how much interest an offset account could save on your home loan.

Offset Account Calculator

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How our offset account calculator shows you how much you can save

This offset calculator provides you with an estimate of the potential interest saving and reduction to your home loan term by having money in an offset account.

Assumptions used

  • Offset Account, Contributions and Extra Repayments: The calculator does not take into account any interest that may be earned on an offset savings account balance, nor do we take into account any extra repayments made on the loan.
  • Mortgage repayments: For whatever mortgage repayment frequency you select (weekly, fortnightly or monthly) we calculate the repayment using principal and interest. For simplicity, we calculate this using 52 weeks and 26 fortnights in a year.
  • Savings: The offset calculator calculates the difference between a standard mortgage schedule and the schedule with the impact of a mortgage offset account factored in. The total interest saved amount shown = Total interest paid on standard mortgage - Total interest paid on mortgage with offset account.

How to use the offset calculator

To use our calculator, you’ll need to enter some details about your home loan. This includes your offset account balance and how often you’ll be making deposits.

  1. Loan balance

    How much do you currently owe on your home loan?

  2. Interest rate

    What's the interest rate you pay on your home loan?

  3. Repayment frequency

    Do you make monthly, fortnightly or weekly mortgage repayments?

  4. Years remaining

    How many years do you have left on your home loan?

  5. Offset account balance

    How much money you currently have in your offset account, including your savings.

  6. Regular offset account deposits

    How much money you’re going to deposit into your offset account and how often. This could be savings, lump sum payments like tax returns or other income streams.

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Once you’ve entered these details, our offset account calculator will give you an estimate of the total interest you could save, as well as how many years and months you could cut off your home loan.

How is an offset account calculated?

Interest on your home loan is calculated daily, so the amount you pay can change each day based on your current offset account balance. When you keep money in your offset account, it reduces the amount of your loan balance that interest is calculated on, meaning you pay interest on a smaller amount.

While interest is calculated daily, it’s applied monthly to your loan. So, if you have a $30,000 balance in your offset account for part of the month, like 10 days, it will only reduce the interest for that amount for those 10 days. This means the longer your balance stays in the account, the more interest you save.

  • Imagine your home loan balance is $600,000 with an interest rate of 6.00% p.a.
  • You have $30,000 in your home loan offset account. The bank will subtract that from the loan balance to arrive at the amount that interest will be charged on.
  • Your annual interest rate is then converted into a daily interest rate: 6% / 365 = 0.000164
  • Now it’s time to calculate the daily interest amount for the loan balance minus the amount in the offset account: 570,000 x 0.000164 = 93.48 (the daily interest amount for the loan balance without the offset account would be 600,000 x 0.000164 = 98.4)
  • The bank then adds up the daily interest charges for the month to arrive at the monthly interest that will be added to your loan. For simplicity, let’s assume the loan balance and offset balance remain the same for the full month, meaning the calculation would be 93.48 x 30 (or however many days are in that month) = $2,804.40
  • In this example, having $30,000 in your offset account means saving $147.60 in interest for the month – $2,804.40 instead of $2,952.

Calculating your offset account savings

Here are some examples of how much an offset account can save you, including the estimated total interest and the time saved on your loan.

Loan amount

$400,000

Interest rate

6.50%

Offset account balance

$20,000

Interest saved over loan term

$102,643

Time saved on loan term

3 years, 4 months

Loan amount

$600,000

Interest rate

6.50%

Offset account balance

$30,000

Interest saved over loan term

$153,964

Time saved on loan term

3 years, 4 months

Loan amount

$800,000

Interest rate

6.50%

Offset account balance

$40,000

Interest saved over loan term

$205,285

Time saved on loan term

3 years, 4 months

Loan amount

$1,000,000

Interest rate

6.50%

Offset account balance

$50,000

Interest saved over loan term

$256,606

Time saved on loan term

3 years, 4 months

Loan amountInterest rateOffset account balanceInterest saved over loan termTime saved on loan term

$400,000

6.50%

$20,000

$102,643

3 years, 4 months

$600,000

6.50%

$30,000

$153,964

3 years, 4 months

$800,000

6.50%

$40,000

$205,285

3 years, 4 months

$1,000,000

6.50%

$50,000

$256,606

3 years, 4 months

This table is based on a 30-year home loan with principal & interest repayments. Other fees and charges applied by lenders would also affect the interest amount. This example assumes the interest rate and offset account balance remain the same over the loan term.

Home loans guides & resources

What's the next step on your property journey? Our home loan guides will help you navigate the road ahead, whether you're buying, building or looking to save on an existing loan.

Compare home loans with offset

See a selection of offset home loans available to owner-occupiers looking to refinance. Products shown are based on a loan amount of $500k.

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Rates updated 03 July 2026

Important Disclosures
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South West Slopes Bank Intro Discounted Standard Variable Home Loan

Interest rate

5.70%

per annum (variable)

Comparison rate

6.06%

per annum

Redraw

Offset

Max LVR 90%

Compare now
on Money.com.au
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Gateway Bank Green Plus Home Loan

Interest rate

5.85%

per annum (variable)

Comparison rate

6.14%

per annum

Redraw

Offset

Max LVR 80%

Compare now
on Money.com.au
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Police Credit Union Low Rate Home Loan Special Offer

Interest rate

5.89%

per annum (variable)

Comparison rate

5.93%

per annum

Redraw

Offset

Max LVR 80%

Compare now
on Money.com.au
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Transport Mutual Credit Union Refi Special Home Loan

Interest rate

5.89%

per annum (variable)

Comparison rate

5.99%

per annum

Redraw

Offset

App Fee: $395

Max LVR 80%

Compare now
on Money.com.au
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Bank of China Discount Plus Home Loan - Australian Income

Interest rate

5.93%

per annum (variable)

Comparison rate

6.31%

per annum

Redraw

Offset

Max LVR 80%

Compare now
on Money.com.au

Important Disclosures

Home loan comparison rates are calculated based on a loan amount of $150,000 repaid over a 25-year term with monthly repayments. The comparison rates only apply to the examples given. Different loan amounts and terms will result in different comparison rates. Costs such as redraw fees or early repayment fees and cost savings such as fee waivers are not included in the comparison rate but may influence the cost of the loan. Check with the provider for full loan details, including rates, fees, eligibility and terms and conditions to make sure the product is right for you.

General information only The information on this page is general in nature and has been prepared without considering your objectives, financial situation or needs. You should consider whether the information provided and the nature of any home loan product is suitable for you and seek independent financial advice if necessary.

We are not providing you with a recommendation or suggestion about a particular home loan. You should read the relevant disclosure statements or other offer documents before deciding whether to apply for or continue to use a particular product.

What products, features and information are shown While we make every effort to ensure all home loans available in Australia are shown in our comparison tables, we do not guarantee that all products are included.

Our product comparisons may not compare all home loan features and attributes relevant to you.

Product information, such as interest rates, fees and charges, is subject to change without notice. Before acting on any information, you should confirm the relevant product information with the lender.

How home loans are sorted and filtered by default When results load initially in the main comparison table on this page, we show relevant loans from our sponsored partners first, then all loans on our database starting with the lowest relevant rate available from each of Australia's top 10 largest lenders first (top 10 is according to APRA, based on total value of loans per lender). We know these are the rates our customers are most interested in seeing. After these initial results, we show all products on our database, sorted as follows:

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  • Lowest regular repayment amount, then;
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  • Loans interest rate, then;
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  • Lowest comparison rate, then;
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  • Provider name (A-Z)

Some home loan products listed in our tables are available through a mortgage broker. Mortgage brokers may not be able to offer loans from every provider and there may be more suitable loans for your personal circumstances.

Mortgage brokers are not authorised by Money Pty Ltd's Australian Credit Licence and operate under their own Australian Credit Licence, or as a credit representative of another Australian Credit Licensee. Mortgage brokers can make recommendations about home loan products that may suit your objectives, financial situation and needs.

Our tables feature all home loans available from lenders on our database that match the search criteria selected. Lenders do not pay to feature in our tables. Partner lenders with loans marked as ‘sponsored’ may pay a commission to Money.com.au if you click to visit their website.

If you get help from a mortgage broker as a result of visiting this page, we may earn a commission.

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WE GIVE A BUCK®

The calculator provided on money.com.au is intended for informational and illustrative purposes only. The results generated by this calculator are based on the inputs you provide and the assumptions set by us. These results should not be considered as financial advice or a recommendation to buy or sell any financial product. By using this calculator, you acknowledge and agree to the terms set out in this disclaimer. For more detailed information, please review our full terms and conditions on the website.

Assumptions:

  • The calculations do not account for changes in interest rates or other market conditions that may occur.
  • Results are approximations and may differ from actual payment schedules or amounts.
  • The calculator does not include all fees and charges that you may incur in relation to a financial product.

Limitation

  • This calculator does not guarantee the availability of any financial product or the accuracy of the calculations. Please consult a financial advisor or the relevant product provider to obtain specific advice tailored to your circumstances.
  • money.com.au does not accept any liability for errors or omissions, or for any loss you may suffer as a result of relying on these calculations.

© Copyright 2026 Money Pty Ltd.

© Copyright 2026 Money Pty Ltd.
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