See exactly how much time and interest your offset account saves — with mathematically verified results. Fortnightly payments genuinely shorten your loan.
✓ RBA & ATO sourced rates·Updated July 2025·✓ Maths independently verified (20/20 UAT)·✓ No sponsored results·
Advertisement
See your results ↓ tap to jump
🏠
Loan details
Loan amount
$
Property value (for LVR)?Loan-to-Value Ratio (LVR) = your loan ÷ property value. Above 80% LVR usually means Lenders Mortgage Insurance (LMI) applies, adding thousands to your cost.
$
Interest rate
%
Loan term
yrs
Loan type
IO period (yrs)
yrs
Repayment frequency
Loan start date
💰 Offset account
▼
Current offset balance
?Your offset account balance reduces the loan balance interest is charged on. $50k offset on a $600k loan means you only pay interest on $550k — saving thousands over the life of the loan.
$
Regular deposits
$
Deposit frequency
Deposits start (month #)
mth
⬆️ Extra repayments & lump sums
▼
Extra repayment impact
Interest saved
—
Time cut from loan
—
Return per $1,000 extra/yr
—
in interest saved
Loan paid off
—
—
Total extra paid
—
—
Effective return rate
—
guaranteed, risk-free
💡 Every dollar of extra repayment saves you your interest rate in guaranteed, tax-free return — often better than a savings account after tax.
📈 Future rate changes
▼
Model rate changes — e.g. when a fixed period expires, or RBA rate scenarios.
⚖️ Compare a second rate
▼
Rate to compare
%
Label
📋
Amortisation schedule
Period
Repayment
Interest
Principal
Offset bal
Balance
✓ Saved
Interest = (balance − offset) × monthly rate. Repayment is fixed; offset reduces interest so more goes to principal, shortening loan. · RBA · ATO
⚠️ If your result looks unexpected, check: interest rate format (enter 6.19, not 0.0619), offset balance isn't larger than your loan, and loan term is in years not months.
ℹ
General information only — this is not financial advice. This calculator is a modelling tool that produces estimates based on the inputs you provide. Results may differ from your actual loan outcomes due to changes in interest rates, lender fees, tax legislation, or your personal circumstances. Australian Life Costs does not hold an Australian Financial Services Licence (AFSL) and is not authorised to provide personal financial advice. The information on this page is general in nature only. Before making any financial decision — including taking out, refinancing, or restructuring a home loan — we strongly recommend consulting a licensed financial adviser or mortgage broker. Find a licensed adviser via ASIC MoneySmart →