Offset Account Calculator — How Much Does an Offset Save? — Australia 2026
Calculate how much interest your mortgage offset account saves. See the impact of different offset balances on your total loan cost and payoff time.
A mortgage offset account is a transaction account linked to your home loan. The balance in your offset account is subtracted from your loan balance when calculating interest. For example with a $500000 loan and $50000 in your offset you only pay interest on $450000. This can save tens of thousands in interest and years off your loan. The offset account is one of the most powerful mortgage features unique to Australian banking.
How much does a $50000 offset save?
On a $500000 loan at 6% for 30 years: without offset you pay $579000 total interest. With $50000 permanent offset you pay $503000 interest saving $76000 and paying off the loan 3 years early. The savings increase dramatically with larger offsets. A $100000 offset saves $140000 and cuts the loan by 5.5 years.
Calculate Now
EMI Calculator
Understanding Your Investment Returns
This calculator projects your returns using compound interest, where your earnings generate their own earnings over time. The power of compounding means that even small regular investments can grow into substantial wealth over long periods. For example, investing just Rs 5,000 per month at 12% expected returns for 25 years can grow to over Rs 1 crore — of which only Rs 15 lakh is your own money and Rs 85 lakh is compounding returns. The key factors that determine your final corpus are: the amount invested, the rate of return, the duration of investment, and the frequency of compounding.
Important Considerations
Past returns do not guarantee future performance, especially for market-linked instruments like mutual funds and equities. The returns shown are estimates based on the rate you enter. Equity investments carry market risk but have historically delivered 12-15% CAGR over 15+ year periods in India. Fixed income options like PPF (7.1%) and FD (6-7.5%) offer lower but more predictable returns. Diversifying across asset classes — equity, debt, gold, and real estate — reduces overall portfolio risk while optimizing returns for your risk tolerance.
Key Information
| Parameter | Details |
|---|---|
| How It Works | Offset balance reduces interest-bearing loan balance |
| Typical Savings (50K offset) | Save $60000-$100000 over 30 years |
| Tax Advantage | Interest saved is not taxable income |
| Best For | People who maintain cash savings |
Calculate offset savings
Get accurate results instantly — 100% free, no signup required
Use Calculator NowFrequently Asked Questions
How much does a $50000 offset save?
On a $500000 loan at 6% for 30 years: without offset you pay $579000 total interest. With $50000 permanent offset you pay $503000 interest saving $76000 and paying off the loan 3 years early. The savings increase dramatically with larger offsets. A $100000 offset saves $140000 and cuts the loan by 5.5 years.
Is an offset better than making extra repayments?
Offset is better for flexibility because you can withdraw money anytime without affecting your loan. Extra repayments are locked into the loan (though redraw may be available). Both achieve the same interest saving. If you might need access to the money use offset. If you want to force savings and reduce temptation make extra repayments. Tax-wise both are identical.
Should I save in offset or invest elsewhere?
If your mortgage rate is 6% money in offset gives you a guaranteed after-tax return of 6%. To beat this with investments you need pre-tax returns of approximately 8.5% (assuming 30% tax rate). While shares historically return 8-10% this is not guaranteed. Risk-averse strategy: fill your offset first then invest above that. Aggressive strategy: invest surplus since long-term share returns typically beat mortgage rates.
What is compound interest and why does it matter?
Compound interest means you earn interest on your interest, not just your principal. Over long periods, this creates exponential growth — even small regular investments can grow into substantial wealth over 15-25 years.
Should I invest regularly or as a lump sum?
Regular investing (dollar-cost averaging) smooths out market volatility by buying at various price points. Lump sum investing works better if markets are undervalued. For most people, regular monthly investing is simpler and more disciplined.
How much should I invest monthly to reach my goal?
The amount depends on your target, timeline, and expected returns. Use this calculator to model different scenarios. The key factors are starting early, investing consistently, and reinvesting returns.
Are investment returns taxable?
Tax treatment varies by investment type and country. Capital gains, dividends, and interest income may be taxed differently. Consult a tax professional for advice specific to your situation and jurisdiction.
Related Calculators
More Investment Calculators
Last updated: March 2026