Mortgage Offset Calculator (Australia)
How an offset account cuts Australian mortgage interest — repayment, first-year interest saved and effective rate.
Formula
Disclaimer: Assumes a constant average offset balance and constant rate; package fees not netted. Not financial or tax advice.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Need mortgage offset calculator results fast? Skip the spreadsheet and get a clear, defensible answer in one step — free, private and instant, recalculating live as you change any input.
About Mortgage Offset Calculator (Australia)
The offset account is Australian mortgage culture's signature move: a transaction account whose balance is subtracted from your loan before daily interest is calculated. Park $40,000 against the default $550,000 at 6.1% and you save ~$2,440 of interest a year — equivalent to earning 6.1% tax-free on your savings, which no savings account after tax can match for most earners. Because your repayment doesn't change, every dollar of offset-saved interest silently becomes extra principal repayment — the loan dies years early without you lifting a finger. Salary-crediting into the offset and living off a credit card paid monthly (the 'debt recycling lite' cashflow pattern) maximizes the average daily balance that drives the saving. Offset vs redraw: similar math, different law — offset money is YOURS in a deposit account (cleanest for tax if the property later becomes a rental, and instantly accessible), while redraw is the BANK letting you take back extra repayments (slower, occasionally frozen, and messy for investment-interest deductibility). Offset packages cost ~$300–400/year or +0.1–0.2% on rate; the breakeven offset balance is roughly $5,000–6,500 at current rates — below that, take the cheaper no-frills loan.
How to use Mortgage Offset Calculator (Australia)
- 1Enter Loan balance, Average offset account balance, Interest rate (%), Remaining term (years) into the Mortgage Offset Calculator.
- 2The result is computed automatically using Interest accrues on (loan − offset balance) daily; repayments stay the same, so the offset's saving goes 100% to principal — there is no button to press; it updates live as you type.
- 3Change any input to model a different scenario, then use “Copy result link” to share the exact numbers.
Why use Mortgage Offset Calculator (Australia)?
- ✓Computes mortgage offset calculator instantly with the correct formula — no spreadsheet needed
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser, so the figures you enter are never uploaded or stored
- ✓Shows the formula, a live worked example and references so you can defend the number
Frequently asked questions
Is offset really better than a high-interest savings account?+
For most borrowers, decisively: savings interest is taxed at your marginal rate (a 5% account nets ~3.4% at a 32.5% bracket), while offset 'earns' your mortgage rate tax-free — 6.1% at the defaults. The only savers who should prefer HISAs are those on very low tax rates during promo-rate windows.
Offset account ka annual fee worth hai ya nahi?+
Break-even nikaliye: $395 package fee ÷ 6.1% ≈ $6,475. Agar aapka average offset balance saal bhar isse upar rahta hai to package jeet gaya (aur usme aksar fee-free cards waghaira bhi aate hain). Isse kam balance par no-fee basic loan + redraw sasta padega.
Does offset change my monthly repayment?+
No — repayments stay contractual; the offset reduces the INTEREST portion inside each payment, so more of the same dollar hits principal. That's the magic: the benefit compounds invisibly. Some lenders offer 'interest-saving as lower payment' instead — refuse it; you want the term compression.
What happens to my offset if the property becomes an investment?+
This is where offset beats redraw structurally: offset cash is your money, so withdrawing it (e.g., for your next home) leaves the original loan — now against a rental — fully intact and its interest fully deductible. Equivalent redraw withdrawals contaminate deductibility. Landlords-to-be should default to offset and keep records.
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